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llvm-project/llvm/test/Transforms/IndVarSimplify/eliminate-comparison.ll

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[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
; RUN: opt -indvars -S < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
@X = external global [0 x double]
; Indvars should be able to simplify simple comparisons involving
; induction variables.
define void @foo(i64 %n, i32* nocapture %p) nounwind {
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-LABEL: @foo(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP9:%.*]] = icmp sgt i64 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP9]], label [[PRE:%.*]], label [[RETURN:%.*]]
; CHECK: pre:
; CHECK-NEXT: [[T3:%.*]] = load i32, i32* [[P:%.*]]
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp ne i32 [[T3]], 0
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[I:%.*]] = phi i64 [ 0, [[PRE]] ], [ [[INC:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT: [[COND:%.*]] = and i1 [[TOBOOL_NOT]], true
; CHECK-NEXT: br i1 [[COND]], label [[IF_THEN:%.*]], label [[FOR_INC]]
; CHECK: if.then:
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr [0 x double], [0 x double]* @X, i64 0, i64 [[I]]
; CHECK-NEXT: store double 3.200000e+00, double* [[ARRAYIDX]]
; CHECK-NEXT: br label [[FOR_INC]]
; CHECK: for.inc:
; CHECK-NEXT: [[INC]] = add nuw nsw i64 [[I]], 1
; CHECK-NEXT: [[EXITCOND1:%.*]] = icmp eq i64 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND1]], label [[RETURN_LOOPEXIT:%.*]], label [[LOOP]]
; CHECK: return.loopexit:
; CHECK-NEXT: br label [[RETURN]]
; CHECK: return:
; CHECK-NEXT: ret void
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
%cmp9 = icmp sgt i64 %n, 0
br i1 %cmp9, label %pre, label %return
pre:
%t3 = load i32, i32* %p
%tobool.not = icmp ne i32 %t3, 0
br label %loop
loop:
%i = phi i64 [ 0, %pre ], [ %inc, %for.inc ]
%cmp6 = icmp slt i64 %i, %n
%cond = and i1 %tobool.not, %cmp6
br i1 %cond, label %if.then, label %for.inc
if.then:
%arrayidx = getelementptr [0 x double], [0 x double]* @X, i64 0, i64 %i
store double 3.200000e+00, double* %arrayidx
br label %for.inc
for.inc:
%inc = add nsw i64 %i, 1
%exitcond = icmp sge i64 %inc, %n
br i1 %exitcond, label %return, label %loop
return:
ret void
}
; Don't eliminate an icmp that's contributing to the loop exit test though.
define i32 @_ZNK4llvm5APInt3ultERKS0_(i32 %tmp2.i1, i64** %tmp65, i64** %tmp73, i64** %tmp82, i64** %tmp90) {
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-LABEL: @_ZNK4llvm5APInt3ultERKS0_(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB18:%.*]]
; CHECK: bb13:
; CHECK-NEXT: [[TMP66:%.*]] = load i64*, i64** [[TMP65:%.*]], align 4
; CHECK-NEXT: [[TMP68:%.*]] = getelementptr inbounds i64, i64* [[TMP66]], i32 [[I:%.*]]
; CHECK-NEXT: [[TMP69:%.*]] = load i64, i64* [[TMP68]], align 4
; CHECK-NEXT: [[TMP74:%.*]] = load i64*, i64** [[TMP73:%.*]], align 4
; CHECK-NEXT: [[TMP76:%.*]] = getelementptr inbounds i64, i64* [[TMP74]], i32 [[I]]
; CHECK-NEXT: [[TMP77:%.*]] = load i64, i64* [[TMP76]], align 4
; CHECK-NEXT: [[TMP78:%.*]] = icmp ugt i64 [[TMP69]], [[TMP77]]
; CHECK-NEXT: br i1 [[TMP78]], label [[BB20_LOOPEXIT:%.*]], label [[BB15:%.*]]
; CHECK: bb15:
; CHECK-NEXT: [[TMP83:%.*]] = load i64*, i64** [[TMP82:%.*]], align 4
; CHECK-NEXT: [[TMP85:%.*]] = getelementptr inbounds i64, i64* [[TMP83]], i32 [[I]]
; CHECK-NEXT: [[TMP86:%.*]] = load i64, i64* [[TMP85]], align 4
; CHECK-NEXT: [[TMP91:%.*]] = load i64*, i64** [[TMP90:%.*]], align 4
; CHECK-NEXT: [[TMP93:%.*]] = getelementptr inbounds i64, i64* [[TMP91]], i32 [[I]]
; CHECK-NEXT: [[TMP94:%.*]] = load i64, i64* [[TMP93]], align 4
; CHECK-NEXT: [[TMP95:%.*]] = icmp ult i64 [[TMP86]], [[TMP94]]
; CHECK-NEXT: br i1 [[TMP95]], label [[BB20_LOOPEXIT]], label [[BB17:%.*]]
; CHECK: bb17:
; CHECK-NEXT: [[TMP97:%.*]] = add nsw i32 [[I]], -1
; CHECK-NEXT: br label [[BB18]]
; CHECK: bb18:
; CHECK-NEXT: [[I]] = phi i32 [ [[TMP2_I1:%.*]], [[ENTRY:%.*]] ], [ [[TMP97]], [[BB17]] ]
; CHECK-NEXT: [[TMP99:%.*]] = icmp sgt i32 [[I]], -1
; CHECK-NEXT: br i1 [[TMP99]], label [[BB13:%.*]], label [[BB20_LOOPEXIT]]
; CHECK: bb20.loopexit:
; CHECK-NEXT: [[TMP_0_PH:%.*]] = phi i32 [ 0, [[BB18]] ], [ 1, [[BB15]] ], [ 0, [[BB13]] ]
; CHECK-NEXT: ret i32 [[TMP_0_PH]]
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
br label %bb18
bb13:
%tmp66 = load i64*, i64** %tmp65, align 4
%tmp68 = getelementptr inbounds i64, i64* %tmp66, i32 %i
%tmp69 = load i64, i64* %tmp68, align 4
%tmp74 = load i64*, i64** %tmp73, align 4
%tmp76 = getelementptr inbounds i64, i64* %tmp74, i32 %i
%tmp77 = load i64, i64* %tmp76, align 4
%tmp78 = icmp ugt i64 %tmp69, %tmp77
br i1 %tmp78, label %bb20.loopexit, label %bb15
bb15:
%tmp83 = load i64*, i64** %tmp82, align 4
%tmp85 = getelementptr inbounds i64, i64* %tmp83, i32 %i
%tmp86 = load i64, i64* %tmp85, align 4
%tmp91 = load i64*, i64** %tmp90, align 4
%tmp93 = getelementptr inbounds i64, i64* %tmp91, i32 %i
%tmp94 = load i64, i64* %tmp93, align 4
%tmp95 = icmp ult i64 %tmp86, %tmp94
br i1 %tmp95, label %bb20.loopexit, label %bb17
bb17:
%tmp97 = add nsw i32 %i, -1
br label %bb18
bb18:
%i = phi i32 [ %tmp2.i1, %entry ], [ %tmp97, %bb17 ]
%tmp99 = icmp sgt i32 %i, -1
br i1 %tmp99, label %bb13, label %bb20.loopexit
bb20.loopexit:
%tmp.0.ph = phi i32 [ 0, %bb18 ], [ 1, %bb15 ], [ 0, %bb13 ]
ret i32 %tmp.0.ph
}
; Indvars should eliminate the icmp here.
define void @func_10() nounwind {
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-LABEL: @func_10(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: store i64 [[INDVARS_IV]], i64* null
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT: br i1 false, label [[LOOP]], label [[RETURN:%.*]]
; CHECK: return:
; CHECK-NEXT: ret void
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
br label %loop
loop:
%i = phi i32 [ %i.next, %loop ], [ 0, %entry ]
%t0 = icmp slt i32 %i, 0
%t1 = zext i1 %t0 to i32
%t2 = add i32 %t1, %i
%u3 = zext i32 %t2 to i64
store i64 %u3, i64* null
%i.next = add i32 %i, 1
br i1 undef, label %loop, label %return
return:
ret void
}
; PR14432
; Indvars should not turn the second loop into an infinite one.
define i32 @func_11() nounwind uwtable {
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-LABEL: @func_11(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FORCOND:%.*]]
; CHECK: forcond:
; CHECK-NEXT: [[__KEY6_0:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ [[TMP37:%.*]], [[NOASSERT:%.*]] ]
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND1:%.*]] = icmp ne i32 [[__KEY6_0]], 10
; CHECK-NEXT: br i1 [[EXITCOND1]], label [[NOASSERT]], label [[FORCOND38_PREHEADER:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: forcond38.preheader:
; CHECK-NEXT: br label [[FORCOND38:%.*]]
; CHECK: noassert:
; CHECK-NEXT: [[TMP13:%.*]] = sdiv i32 -32768, [[__KEY6_0]]
; CHECK-NEXT: [[TMP2936:%.*]] = shl i32 [[TMP13]], 24
; CHECK-NEXT: [[SEXT23:%.*]] = shl i32 [[TMP13]], 24
; CHECK-NEXT: [[TMP32:%.*]] = icmp eq i32 [[TMP2936]], [[SEXT23]]
; CHECK-NEXT: [[TMP37]] = add nuw nsw i32 [[__KEY6_0]], 1
; CHECK-NEXT: br i1 [[TMP32]], label [[FORCOND]], label [[ASSERT33:%.*]]
; CHECK: assert33:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: forcond38:
; CHECK-NEXT: [[__KEY8_0:%.*]] = phi i32 [ [[TMP81:%.*]], [[NOASSERT68:%.*]] ], [ 2, [[FORCOND38_PREHEADER]] ]
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[__KEY8_0]], 10
; CHECK-NEXT: br i1 [[EXITCOND]], label [[NOASSERT68]], label [[UNROLLEDEND:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: noassert68:
; CHECK-NEXT: [[TMP57:%.*]] = sdiv i32 -32768, [[__KEY8_0]]
; CHECK-NEXT: [[SEXT34:%.*]] = shl i32 [[TMP57]], 16
; CHECK-NEXT: [[SEXT21:%.*]] = shl i32 [[TMP57]], 16
; CHECK-NEXT: [[TMP76:%.*]] = icmp eq i32 [[SEXT34]], [[SEXT21]]
; CHECK-NEXT: [[TMP81]] = add nuw nsw i32 [[__KEY8_0]], 1
; CHECK-NEXT: br i1 [[TMP76]], label [[FORCOND38]], label [[ASSERT77:%.*]]
; CHECK: assert77:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: unrolledend:
; CHECK-NEXT: ret i32 0
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp eq i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @llvm.trap() noreturn nounwind
; In this case the second loop only has a single iteration, fold the header away
define i32 @func_12() nounwind uwtable {
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-LABEL: @func_12(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FORCOND:%.*]]
; CHECK: forcond:
; CHECK-NEXT: [[__KEY6_0:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ [[TMP37:%.*]], [[NOASSERT:%.*]] ]
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[__KEY6_0]], 10
; CHECK-NEXT: br i1 [[EXITCOND]], label [[NOASSERT]], label [[FORCOND38_PREHEADER:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: forcond38.preheader:
; CHECK-NEXT: br label [[FORCOND38:%.*]]
; CHECK: noassert:
; CHECK-NEXT: [[TMP13:%.*]] = sdiv i32 -32768, [[__KEY6_0]]
; CHECK-NEXT: [[TMP2936:%.*]] = shl i32 [[TMP13]], 24
; CHECK-NEXT: [[SEXT23:%.*]] = shl i32 [[TMP13]], 24
; CHECK-NEXT: [[TMP32:%.*]] = icmp eq i32 [[TMP2936]], [[SEXT23]]
; CHECK-NEXT: [[TMP37]] = add nuw nsw i32 [[__KEY6_0]], 1
; CHECK-NEXT: br i1 [[TMP32]], label [[FORCOND]], label [[ASSERT33:%.*]]
; CHECK: assert33:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: forcond38:
[IndVars] Remove dead instructions after folding trivial loop exit In rL364135, I taught IndVars to fold exiting branches in loops with a zero backedge taken count (i.e. loops that only run one iteration). This extends that to eliminate the dead comparison left around. llvm-svn: 364155
2019-06-24 01:06:57 +08:00
; CHECK-NEXT: br i1 true, label [[NOASSERT68:%.*]], label [[UNROLLEDEND:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: noassert68:
Exploit a zero LoopExit count to eliminate loop exits This turned out to be surprisingly effective. I was originally doing this just for completeness sake, but it seems like there are a lot of cases where SCEV's exit count reasoning is stronger than it's isKnownPredicate reasoning. Once this is in, I'm thinking about trying to build on the same infrastructure to eliminate provably untaken checks. There may be something generally interesting here. Differential Revision: https://reviews.llvm.org/D63618 llvm-svn: 364135
2019-06-23 01:54:25 +08:00
; CHECK-NEXT: br i1 false, label [[FORCOND38]], label [[ASSERT77:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: assert77:
; CHECK-NEXT: tail call void @llvm.trap()
; CHECK-NEXT: unreachable
; CHECK: unrolledend:
; CHECK-NEXT: ret i32 0
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
br label %forcond
forcond: ; preds = %noassert, %entry
%__key6.0 = phi i32 [ 2, %entry ], [ %tmp37, %noassert ]
%tmp5 = icmp slt i32 %__key6.0, 10
br i1 %tmp5, label %noassert, label %forcond38.preheader
forcond38.preheader: ; preds = %forcond
br label %forcond38
noassert: ; preds = %forbody
%tmp13 = sdiv i32 -32768, %__key6.0
%tmp2936 = shl i32 %tmp13, 24
%sext23 = shl i32 %tmp13, 24
%tmp32 = icmp eq i32 %tmp2936, %sext23
%tmp37 = add i32 %__key6.0, 1
br i1 %tmp32, label %forcond, label %assert33
assert33: ; preds = %noassert
tail call void @llvm.trap()
unreachable
forcond38: ; preds = %noassert68, %forcond38.preheader
%__key8.0 = phi i32 [ %tmp81, %noassert68 ], [ 2, %forcond38.preheader ]
%tmp46 = icmp slt i32 %__key8.0, 10
br i1 %tmp46, label %noassert68, label %unrolledend
noassert68: ; preds = %forbody39
%tmp57 = sdiv i32 -32768, %__key8.0
%sext34 = shl i32 %tmp57, 16
%sext21 = shl i32 %tmp57, 16
%tmp76 = icmp ne i32 %sext34, %sext21
%tmp81 = add i32 %__key8.0, 1
br i1 %tmp76, label %forcond38, label %assert77
assert77: ; preds = %noassert68
tail call void @llvm.trap()
unreachable
unrolledend: ; preds = %forcond38
ret i32 0
}
declare void @side_effect()
define void @func_13(i32* %len.ptr) {
; CHECK-LABEL: @func_13(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], !range !0
; CHECK-NEXT: [[LEN_IS_ZERO:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: br i1 [[LEN_IS_ZERO]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
br i1 %len.is.zero, label %leave, label %loop
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_14(i32* %len.ptr) {
; CHECK-LABEL: @func_14(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], !range !0
; CHECK-NEXT: [[LEN_IS_ZERO:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: [[LEN_IS_INT_MIN:%.*]] = icmp eq i32 [[LEN]], -2147483648
; CHECK-NEXT: [[NO_ENTRY:%.*]] = or i1 [[LEN_IS_ZERO]], [[LEN_IS_INT_MIN]]
; CHECK-NEXT: br i1 [[NO_ENTRY]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%len = load i32, i32* %len.ptr, !range !0
%len.sub.1 = add i32 %len, -1
%len.is.zero = icmp eq i32 %len, 0
%len.is.int_min = icmp eq i32 %len, 2147483648
%no.entry = or i1 %len.is.zero, %len.is.int_min
br i1 %no.entry, label %leave, label %loop
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp slt i32 %iv, %len
br i1 %iv.cmp, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len.sub.1
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_15(i32* %len.ptr) {
; CHECK-LABEL: @func_15(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], !range !0
; CHECK-NEXT: [[LEN_ADD_1:%.*]] = add i32 [[LEN]], 1
; CHECK-NEXT: [[LEN_ADD_1_IS_ZERO:%.*]] = icmp eq i32 [[LEN_ADD_1]], 0
; CHECK-NEXT: br i1 [[LEN_ADD_1_IS_ZERO]], label [[LEAVE:%.*]], label [[LOOP_PREHEADER:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LEN_ADD_1]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%len = load i32, i32* %len.ptr, !range !0
%len.add.1 = add i32 %len, 1
%len.add.1.is.zero = icmp eq i32 %len.add.1, 0
br i1 %len.add.1.is.zero, label %leave, label %loop
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.cmp = icmp ult i32 %iv, %len.add.1
br i1 %iv.cmp, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp ult i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_16(i32* %len.ptr) {
; CHECK-LABEL: @func_16(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]], !range !0
; CHECK-NEXT: [[LEN_ADD_5:%.*]] = add i32 [[LEN]], 5
; CHECK-NEXT: [[ENTRY_COND_0:%.*]] = icmp slt i32 [[LEN]], 2147483643
; CHECK-NEXT: [[ENTRY_COND_1:%.*]] = icmp slt i32 4, [[LEN_ADD_5]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = and i1 [[ENTRY_COND_0]], [[ENTRY_COND_1]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[TMP0:%.*]] = add nuw nsw i32 [[LEN]], 1
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[TMP0]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%len = load i32, i32* %len.ptr, !range !0
%len.add.5 = add i32 %len, 5
%entry.cond.0 = icmp slt i32 %len, 2147483643
%entry.cond.1 = icmp slt i32 4, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.add.4 = add i32 %iv, 4
%iv.cmp = icmp slt i32 %iv.add.4, %len.add.5
br i1 %iv.cmp, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv, %len
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_17(i32* %len.ptr) {
; CHECK-LABEL: @func_17(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_PTR:%.*]]
; CHECK-NEXT: [[LEN_ADD_5:%.*]] = add i32 [[LEN]], -5
; CHECK-NEXT: [[ENTRY_COND_0:%.*]] = icmp slt i32 [[LEN]], -2147483643
; CHECK-NEXT: [[ENTRY_COND_1:%.*]] = icmp slt i32 -6, [[LEN_ADD_5]]
; CHECK-NEXT: [[ENTRY_COND:%.*]] = and i1 [[ENTRY_COND_0]], [[ENTRY_COND_1]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV_2:%.*]] = phi i32 [ [[IV_2_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_2_INC]] = add nuw i32 [[IV_2]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[BE_COND:%.*]] = icmp slt i32 [[IV_2]], [[LEN]]
; CHECK-NEXT: br i1 [[BE_COND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%len = load i32, i32* %len.ptr
%len.add.5 = add i32 %len, -5
%entry.cond.0 = icmp slt i32 %len, 2147483653 ;; 2147483653 == INT_MIN - (-5)
%entry.cond.1 = icmp slt i32 -6, %len.add.5
%entry.cond = and i1 %entry.cond.0, %entry.cond.1
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv.2 = phi i32 [ 0, %entry ], [ %iv.2.inc, %be ]
%iv = phi i32 [ -6, %entry ], [ %iv.inc, %be ]
call void @side_effect()
%iv.inc = add i32 %iv, 1
%iv.2.inc = add i32 %iv.2, 1
%iv.cmp = icmp slt i32 %iv, %len.add.5
; Deduces {-5,+,1} s< (-5 + %len) from {0,+,1} < %len
; since %len s< INT_MIN - (-5) from the entry condition
br i1 %iv.cmp, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv.2, %len
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define i1 @func_18(i16* %tmp20, i32* %len.addr) {
; CHECK-LABEL: @func_18(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[LEN_ADDR:%.*]], !range !0
; CHECK-NEXT: [[TMP18:%.*]] = icmp eq i32 [[LEN]], 0
; CHECK-NEXT: br i1 [[TMP18]], label [[BB2:%.*]], label [[BB0_PREHEADER:%.*]]
; CHECK: bb0.preheader:
; CHECK-NEXT: br label [[BB0:%.*]]
; CHECK: bb0:
; CHECK-NEXT: [[VAR_0_IN:%.*]] = phi i32 [ [[VAR_0:%.*]], [[BB1:%.*]] ], [ [[LEN]], [[BB0_PREHEADER]] ]
; CHECK-NEXT: [[VAR_1:%.*]] = phi i32 [ [[TMP30:%.*]], [[BB1]] ], [ 0, [[BB0_PREHEADER]] ]
; CHECK-NEXT: [[VAR_0]] = add nsw i32 [[VAR_0_IN]], -1
; CHECK-NEXT: br i1 true, label [[STAY:%.*]], label [[BB2_LOOPEXIT:%.*]]
; CHECK: stay:
; CHECK-NEXT: [[TMP25:%.*]] = getelementptr inbounds i16, i16* [[TMP20:%.*]], i32 [[VAR_1]]
; CHECK-NEXT: [[TMP26:%.*]] = load i16, i16* [[TMP25]]
; CHECK-NEXT: [[TMP29:%.*]] = icmp eq i16 [[TMP26]], 0
; CHECK-NEXT: br i1 [[TMP29]], label [[BB1]], label [[BB2_LOOPEXIT]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP30]] = add nuw i32 [[VAR_1]], 1
; CHECK-NEXT: [[TMP31:%.*]] = icmp eq i32 [[VAR_0]], 0
; CHECK-NEXT: br i1 [[TMP31]], label [[BB3:%.*]], label [[BB0]]
; CHECK: bb2.loopexit:
; CHECK-NEXT: br label [[BB2]]
; CHECK: bb2:
; CHECK-NEXT: ret i1 false
; CHECK: bb3:
; CHECK-NEXT: ret i1 true
;
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
entry:
%len = load i32, i32* %len.addr, !range !0
%tmp18 = icmp eq i32 %len, 0
br i1 %tmp18, label %bb2, label %bb0.preheader
bb0.preheader:
br label %bb0
bb0:
%var_0.in = phi i32 [ %var_0, %bb1 ], [ %len, %bb0.preheader ]
%var_1 = phi i32 [ %tmp30, %bb1 ], [ 0, %bb0.preheader ]
%var_0 = add nsw i32 %var_0.in, -1
%tmp23 = icmp ult i32 %var_1, %len
br i1 %tmp23, label %stay, label %bb2
stay:
%tmp25 = getelementptr inbounds i16, i16* %tmp20, i32 %var_1
%tmp26 = load i16, i16* %tmp25
%tmp29 = icmp eq i16 %tmp26, 0
br i1 %tmp29, label %bb1, label %bb2
bb1:
%tmp30 = add i32 %var_1, 1
%tmp31 = icmp eq i32 %var_0, 0
br i1 %tmp31, label %bb3, label %bb0
bb2:
ret i1 false
bb3:
ret i1 true
}
define void @func_19(i32* %length.ptr) {
; CHECK-LABEL: @func_19(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], !range !0
; CHECK-NEXT: [[LENGTH_IS_NONZERO:%.*]] = icmp ne i32 [[LENGTH]], 0
; CHECK-NEXT: br i1 [[LENGTH_IS_NONZERO]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%length = load i32, i32* %length.ptr, !range !0
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
; Like @func_19, but %length is no longer provably positive, so
; %range.check cannot be proved to be always true.
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
define void @func_20(i32* %length.ptr) {
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
; CHECK-LABEL: @func_20(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]]
; CHECK-NEXT: [[LENGTH_IS_NONZERO:%.*]] = icmp ne i32 [[LENGTH]], 0
; CHECK-NEXT: br i1 [[LENGTH_IS_NONZERO]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[BE_COND:%.*]] = icmp slt i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[BE_COND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%length = load i32, i32* %length.ptr
%length.is.nonzero = icmp ne i32 %length, 0
br i1 %length.is.nonzero, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp ult i32 %iv, %length
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
define void @func_21(i32* %length.ptr) {
; CHECK-LABEL: @func_21(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], !range !0
; CHECK-NEXT: [[LIM:%.*]] = sub i32 [[LENGTH]], 1
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LENGTH]], 1
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LIM]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
; This checks that the backedge condition, (I + 1) < Length - 1 implies
; (I + 1) < Length
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
define void @func_22(i32* %length.ptr) {
; CHECK-LABEL: @func_22(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], !range !0
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp sgt i32 [[LENGTH]], 1
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%length = load i32, i32* %length.ptr, !range !0
%lim = sub i32 %length, 1
%entry.cond = icmp sgt i32 %length, 1
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp sle i32 %iv, %length
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp sle i32 %iv.inc, %lim
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_23(i32* %length.ptr) {
; CHECK-LABEL: @func_23(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[LENGTH:%.*]] = load i32, i32* [[LENGTH_PTR:%.*]], !range !0
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp ult i32 4, [[LENGTH]]
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_INC:%.*]], [[BE:%.*]] ], [ 4, [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_INC]] = add nuw nsw i32 [[IV]], 1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
LFTR for multiple exit loops Teach IndVarSimply's LinearFunctionTestReplace transform to handle multiple exit loops. LFTR does two key things 1) it rewrites (all) exit tests in terms of a common IV potentially eliminating one in the process and 2) it moves any offset/indexing/f(i) style logic out of the loop. This turns out to actually be pretty easy to implement. SCEV already has all the information we need to know what the backedge taken count is for each individual exit. (We use that when computing the BE taken count for the loop as a whole.) We basically just need to iterate through the exiting blocks and apply the existing logic with the exit specific BE taken count. (The previously landed NFC makes this super obvious.) I chose to go ahead and apply this to all loop exits instead of only latch exits as originally proposed. After reviewing other passes, the only case I could find where LFTR form was harmful was LoopPredication. I've fixed the latch case, and guards aren't LFTRed anyways. We'll have some more work to do on the way towards widenable_conditions, but that's easily deferred. I do want to note that I added one bit after the review. When running tests, I saw a new failure (no idea why didn't see previously) which pointed out LFTR can rewrite a constant condition back to a loop varying one. This was theoretically possible with a single exit, but the zero case covered it in practice. With multiple exits, we saw this happening in practice for the eliminate-comparison.ll test case because we'd compute a ExitCount for one of the exits which was guaranteed to never actually be reached. Since LFTR ran after simplifyAndExtend, we'd immediately turn around and undo the simplication work we'd just done. The solution seemed obvious, so I didn't bother with another round of review. Differential Revision: https://reviews.llvm.org/D62625 llvm-svn: 363883
2019-06-20 05:58:25 +08:00
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[IV_INC]], [[LENGTH]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%length = load i32, i32* %length.ptr, !range !0
%entry.cond = icmp ult i32 4, %length
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ 4, %entry ], [ %iv.inc, %be ]
%iv.inc = add i32 %iv, 1
%range.check = icmp slt i32 %iv, %length
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp slt i32 %iv.inc, %length
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
define void @func_24(i32* %init.ptr) {
; CHECK-LABEL: @func_24(
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
; CHECK-NEXT: entry:
; CHECK-NEXT: [[INIT:%.*]] = load i32, i32* [[INIT_PTR:%.*]], !range !0
; CHECK-NEXT: [[ENTRY_COND:%.*]] = icmp ugt i32 [[INIT]], 4
; CHECK-NEXT: br i1 [[ENTRY_COND]], label [[LOOP_PREHEADER:%.*]], label [[LEAVE:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_DEC:%.*]], [[BE:%.*]] ], [ [[INIT]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[IV_DEC]] = add nsw i32 [[IV]], -1
; CHECK-NEXT: br i1 true, label [[BE]], label [[LEAVE_LOOPEXIT:%.*]]
; CHECK: be:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[BE_COND:%.*]] = icmp sgt i32 [[IV_DEC]], 4
; CHECK-NEXT: br i1 [[BE_COND]], label [[LOOP]], label [[LEAVE_LOOPEXIT]]
; CHECK: leave.loopexit:
; CHECK-NEXT: br label [[LEAVE]]
; CHECK: leave:
; CHECK-NEXT: ret void
;
entry:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%init = load i32, i32* %init.ptr, !range !0
%entry.cond = icmp ugt i32 %init, 4
br i1 %entry.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
loop:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
%iv = phi i32 [ %init, %entry ], [ %iv.dec, %be ]
%iv.dec = add i32 %iv, -1
%range.check = icmp sgt i32 %iv, 4
br i1 %range.check, label %be, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
be:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
call void @side_effect()
%be.cond = icmp sgt i32 %iv.dec, 4
br i1 %be.cond, label %loop, label %leave
[Tests] Autogen a test so that future changes are understandable llvm-svn: 363882
2019-06-20 05:39:07 +08:00
leave:
Revert "Temporarily Revert "Add basic loop fusion pass."" The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
2019-04-17 12:52:47 +08:00
ret void
}
!0 = !{i32 0, i32 2147483647}