maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity
llvm-project/llvm/test/Transforms/IndVarSimplify/lftr-reuse.ll

234 lines
6.6 KiB
LLVM
Raw Normal View History

Remove redundant -enable-iv-rewrite=false flags from test cases. llvm-svn: 153255
2012-03-23 01:09:04 +08:00
; RUN: opt < %s -indvars -S | FileCheck %s
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
;
; Make sure that indvars can perform LFTR without a canonical IV.
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"
; Perform LFTR using the original pointer-type IV.
; for(char* p = base; p < base + n; ++p) {
; *p = p-base;
; }
define void @ptriv(i8* %base, i32 %n) nounwind {
entry:
%idx.ext = sext i32 %n to i64
%add.ptr = getelementptr inbounds i8* %base, i64 %idx.ext
%cmp1 = icmp ult i8* %base, %add.ptr
br i1 %cmp1, label %for.body, label %for.end
; CHECK: for.body:
; CHECK: phi i8*
; CHECK-NOT: phi
; CHECK-NOT: add
; CHECK: icmp ne i8*
; CHECK: br i1
for.body:
%p.02 = phi i8* [ %base, %entry ], [ %incdec.ptr, %for.body ]
; cruft to make the IV useful
%sub.ptr.lhs.cast = ptrtoint i8* %p.02 to i64
%sub.ptr.rhs.cast = ptrtoint i8* %base to i64
%sub.ptr.sub = sub i64 %sub.ptr.lhs.cast, %sub.ptr.rhs.cast
%conv = trunc i64 %sub.ptr.sub to i8
store i8 %conv, i8* %p.02
%incdec.ptr = getelementptr inbounds i8* %p.02, i32 1
%cmp = icmp ult i8* %incdec.ptr, %add.ptr
br i1 %cmp, label %for.body, label %for.end
for.end:
ret void
}
; It would be nice if SCEV and any loop analysis could assume that
; preheaders exist. Unfortunately it is not always the case. This test
; checks that SCEVExpander can handle an outer loop that has not yet
; been simplified. As a result, the inner loop's exit test will not be
; rewritten.
define void @expandOuterRecurrence(i32 %arg) nounwind {
entry:
%sub1 = sub nsw i32 %arg, 1
%cmp1 = icmp slt i32 0, %sub1
br i1 %cmp1, label %outer, label %exit
outer:
%i = phi i32 [ 0, %entry ], [ %i.inc, %outer.inc ]
%sub2 = sub nsw i32 %arg, %i
%sub3 = sub nsw i32 %sub2, 1
%cmp2 = icmp slt i32 0, %sub3
br i1 %cmp2, label %inner.ph, label %outer.inc
inner.ph:
br label %inner
; CHECK: inner:
; CHECK: icmp slt
; CHECK: br i1
inner:
%j = phi i32 [ 0, %inner.ph ], [ %j.inc, %inner ]
%j.inc = add nsw i32 %j, 1
%cmp3 = icmp slt i32 %j.inc, %sub3
br i1 %cmp3, label %inner, label %outer.inc
; CHECK: outer.inc:
; CHECK: icmp ne
; CHECK: br i1
outer.inc:
%i.inc = add nsw i32 %i, 1
%cmp4 = icmp slt i32 %i.inc, %sub1
br i1 %cmp4, label %outer, label %exit
exit:
ret void
}
; Force SCEVExpander to look for an existing well-formed phi.
; Perform LFTR without generating extra preheader code.
define void @guardedloop([0 x double]* %matrix, [0 x double]* %vector,
i32 %irow, i32 %ilead) nounwind {
; CHECK: entry:
; CHECK-NOT: zext
; CHECK-NOT: add
; CHECK: loop:
; CHECK: phi i64
; CHECK: phi i64
; CHECK-NOT: phi
; CHECK: icmp ne
; CHECK: br i1
entry:
%cmp = icmp slt i32 1, %irow
br i1 %cmp, label %loop, label %return
loop:
%rowidx = phi i32 [ 0, %entry ], [ %row.inc, %loop ]
%i = phi i32 [ 0, %entry ], [ %i.inc, %loop ]
%diagidx = add nsw i32 %rowidx, %i
%diagidxw = sext i32 %diagidx to i64
%matrixp = getelementptr inbounds [0 x double]* %matrix, i32 0, i64 %diagidxw
%v1 = load double* %matrixp
%iw = sext i32 %i to i64
%vectorp = getelementptr inbounds [0 x double]* %vector, i32 0, i64 %iw
%v2 = load double* %vectorp
%row.inc = add nsw i32 %rowidx, %ilead
%i.inc = add nsw i32 %i, 1
%cmp196 = icmp slt i32 %i.inc, %irow
br i1 %cmp196, label %loop, label %return
return:
ret void
}
; Avoid generating extra code to materialize a trip count. Skip LFTR.
define void @unguardedloop([0 x double]* %matrix, [0 x double]* %vector,
i32 %irow, i32 %ilead) nounwind {
entry:
br label %loop
; CHECK: entry:
; CHECK-NOT: zext
; CHECK-NOT: add
; CHECK: loop:
; CHECK: phi i64
; CHECK: phi i64
; CHECK-NOT: phi
; CHECK: icmp slt
; CHECK: br i1
loop:
%rowidx = phi i32 [ 0, %entry ], [ %row.inc, %loop ]
%i = phi i32 [ 0, %entry ], [ %i.inc, %loop ]
%diagidx = add nsw i32 %rowidx, %i
%diagidxw = sext i32 %diagidx to i64
%matrixp = getelementptr inbounds [0 x double]* %matrix, i32 0, i64 %diagidxw
%v1 = load double* %matrixp
%iw = sext i32 %i to i64
%vectorp = getelementptr inbounds [0 x double]* %vector, i32 0, i64 %iw
%v2 = load double* %vectorp
%row.inc = add nsw i32 %rowidx, %ilead
%i.inc = add nsw i32 %i, 1
%cmp196 = icmp slt i32 %i.inc, %irow
br i1 %cmp196, label %loop, label %return
return:
ret void
}
; Remove %i which is only used by the exit test.
; Verify that SCEV can still compute a backedge count from the sign
; extended %n, used for pointer comparison by LFTR.
indvars: Linear function test replace should avoid reusing undef. Fixes PR13371: indvars pass incorrectly substitutes 'undef' values. I do not like this fix. It's needed until/unless the meaning of undef changes. It attempts to be complete according to the IR spec, but I don't have much confidence in the implementation given the difficulty testing undefined behavior. Worse, this invalidates some of my hard-fought work on indvars and LSR to optimize pointer induction variables. It results benchmark regressions, which I'll track internally. On x86_64 no LTO I see: -3% huffbench -3% 400.perlbench -8% fhourstones My only suggestion for recovering is to change the meaning of undef. If we could trust an arbitrary instruction to produce a some real value that can be manipulated (e.g. incremented) according to non-undef rules, then this case could be easily handled with SCEV. llvm-svn: 160421
2012-07-18 12:35:10 +08:00
;
; TODO: Fix for PR13371 currently makes this impossible. See
; IndVarSimplify.cpp hasConcreteDef(). We may want to change to undef rules.
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
define void @geplftr(i8* %base, i32 %x, i32 %y, i32 %n) nounwind {
entry:
%x.ext = sext i32 %x to i64
%add.ptr = getelementptr inbounds i8* %base, i64 %x.ext
%y.ext = sext i32 %y to i64
%add.ptr10 = getelementptr inbounds i8* %add.ptr, i64 %y.ext
%lim = add i32 %x, %n
%cmp.ph = icmp ult i32 %x, %lim
br i1 %cmp.ph, label %loop, label %exit
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @geplftr(
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
; CHECK: loop:
; CHECK: phi i8*
indvars: Linear function test replace should avoid reusing undef. Fixes PR13371: indvars pass incorrectly substitutes 'undef' values. I do not like this fix. It's needed until/unless the meaning of undef changes. It attempts to be complete according to the IR spec, but I don't have much confidence in the implementation given the difficulty testing undefined behavior. Worse, this invalidates some of my hard-fought work on indvars and LSR to optimize pointer induction variables. It results benchmark regressions, which I'll track internally. On x86_64 no LTO I see: -3% huffbench -3% 400.perlbench -8% fhourstones My only suggestion for recovering is to change the meaning of undef. If we could trust an arbitrary instruction to produce a some real value that can be manipulated (e.g. incremented) according to non-undef rules, then this case could be easily handled with SCEV. llvm-svn: 160421
2012-07-18 12:35:10 +08:00
; DISABLE-NOT: phi // This check is currently disabled
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
; CHECK: getelementptr
; CHECK: store
indvars: Linear function test replace should avoid reusing undef. Fixes PR13371: indvars pass incorrectly substitutes 'undef' values. I do not like this fix. It's needed until/unless the meaning of undef changes. It attempts to be complete according to the IR spec, but I don't have much confidence in the implementation given the difficulty testing undefined behavior. Worse, this invalidates some of my hard-fought work on indvars and LSR to optimize pointer induction variables. It results benchmark regressions, which I'll track internally. On x86_64 no LTO I see: -3% huffbench -3% 400.perlbench -8% fhourstones My only suggestion for recovering is to change the meaning of undef. If we could trust an arbitrary instruction to produce a some real value that can be manipulated (e.g. incremented) according to non-undef rules, then this case could be easily handled with SCEV. llvm-svn: 160421
2012-07-18 12:35:10 +08:00
; DISABLE: icmp ne i8* // This check is currently disabled
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
; CHECK: br i1
loop:
%i = phi i32 [ %x, %entry ], [ %inc, %loop ]
%aptr = phi i8* [ %add.ptr10, %entry ], [ %incdec.ptr, %loop ]
%incdec.ptr = getelementptr inbounds i8* %aptr, i32 1
store i8 3, i8* %aptr
%inc = add i32 %i, 1
%cmp = icmp ult i32 %inc, %lim
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; Exercise backedge taken count verification with a never-taken loop.
define void @nevertaken() nounwind uwtable ssp {
entry:
br label %loop
Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. This update was done with the following bash script: find test/Transforms -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_]*\):\( *\)@$FUNC\([( ]*\)\$/;\1\2-LABEL:\3@$FUNC(/g" $TEMP done mv $TEMP $NAME fi done llvm-svn: 186268
2013-07-14 09:42:54 +08:00
; CHECK-LABEL: @nevertaken(
indvars: LinearFunctionTestReplace for non-canonical IVs. For -disable-iv-rewrite, perform LFTR without generating a new "canonical" induction variable. Instead find the "best" existing induction variable for use in the loop exit test and compute the final value of that IV for use in the new loop exit test. In short, convert to a simple eq/ne exit test as long as it's cheap to do so. llvm-svn: 135420
2011-07-19 04:32:31 +08:00
; CHECK: loop:
; CHECK-NOT: phi
; CHECK-NOT: add
; CHECK-NOT: icmp
; CHECK: exit:
loop:
%i = phi i32 [ 0, %entry ], [ %inc, %loop ]
%inc = add nsw i32 %i, 1
%cmp = icmp sle i32 %inc, 0
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; Test LFTR on an IV whose recurrence start is a non-unit pointer type.
define void @aryptriv([256 x i8]* %base, i32 %n) nounwind {
entry:
%ivstart = getelementptr inbounds [256 x i8]* %base, i32 0, i32 0
%ivend = getelementptr inbounds [256 x i8]* %base, i32 0, i32 %n
%cmp.ph = icmp ult i8* %ivstart, %ivend
br i1 %cmp.ph, label %loop, label %exit
; CHECK: loop:
; CHECK: phi i8*
; CHECK-NOT: phi
; CHECK: getelementptr
; CHECK: store
; CHECK: icmp ne i8*
; CHECK: br i1
loop:
%aptr = phi i8* [ %ivstart, %entry ], [ %incdec.ptr, %loop ]
%incdec.ptr = getelementptr inbounds i8* %aptr, i32 1
store i8 3, i8* %aptr
%cmp = icmp ult i8* %incdec.ptr, %ivend
br i1 %cmp, label %loop, label %exit
exit:
ret void
}