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llvm-project/llvm/test/Transforms/IRCE/single-access-with-preloop.ll

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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 -verify-loop-info -irce -S < %s | FileCheck %s
; RUN: opt -verify-loop-info -passes='require<branch-prob>,loop(irce)' -S < %s | FileCheck %s
define void @single_access_with_preloop(i32 *%arr, i32 *%a_len_ptr, i32 %n, i32 %offset) {
entry:
%len = load i32, i32* %a_len_ptr, !range !0
%first.itr.check = icmp sgt i32 %n, 0
br i1 %first.itr.check, label %loop, label %exit
loop:
%idx = phi i32 [ 0, %entry ] , [ %idx.next, %in.bounds ]
%idx.next = add i32 %idx, 1
%array.idx = add i32 %idx, %offset
%abc.high = icmp slt i32 %array.idx, %len
%abc.low = icmp sge i32 %array.idx, 0
%abc = and i1 %abc.low, %abc.high
br i1 %abc, label %in.bounds, label %out.of.bounds, !prof !1
in.bounds:
%addr = getelementptr i32, i32* %arr, i32 %array.idx
store i32 0, i32* %addr
%next = icmp slt i32 %idx.next, %n
br i1 %next, label %loop, label %exit
out.of.bounds:
ret void
exit:
ret void
}
; CHECK-LABEL: @single_access_with_preloop(
; CHECK: loop.preheader:
; CHECK: [[check_min_sint_offset:[^ ]+]] = icmp sgt i32 %offset, -2147483647
; CHECK: [[safe_offset_preloop:[^ ]+]] = select i1 [[check_min_sint_offset]], i32 %offset, i32 -2147483647
; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version.
Revert "[SCEV] Use wrap flags in InsertBinop" This reverts commit r362687. Miscompiles llvm-profdata during selfhost. llvm-svn: 362699
2019-06-06 20:35:46 +08:00
; CHECK: [[safe_start:[^ ]+]] = sub i32 0, [[safe_offset_preloop]]
[SCEV] Add explicit representations of umin/smin Summary: Currently we express umin as `~umax(~x, ~y)`. However, this becomes a problem for operands in non-integral pointer spaces, because `~x` is not something we can compute for `x` non-integral. However, since comparisons are generally still allowed, we are actually able to express `umin(x, y)` directly as long as we don't try to express is as a umax. Support this by adding an explicit umin/smin representation to SCEV. We do this by factoring the existing getUMax/getSMax functions into a new function that does all four. The previous two functions were largely identical. Reviewed By: sanjoy Differential Revision: https://reviews.llvm.org/D50167 llvm-svn: 360159
2019-05-07 23:28:47 +08:00
; CHECK: [[exit_preloop_at_cond_loclamp:[^ ]+]] = icmp slt i32 %n, [[safe_start]]
; CHECK: [[exit_preloop_at_loclamp:[^ ]+]] = select i1 [[exit_preloop_at_cond_loclamp]], i32 %n, i32 [[safe_start]]
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: [[exit_preloop_at_cond:[^ ]+]] = icmp sgt i32 [[exit_preloop_at_loclamp]], 0
; CHECK: [[exit_preloop_at:[^ ]+]] = select i1 [[exit_preloop_at_cond]], i32 [[exit_preloop_at_loclamp]], i32 0
[SCEV] Pass NoWrapFlags when expanding an AddExpr InsertBinop now accepts NoWrapFlags, so pass them through when expanding a simple add expression. This is the first re-commit of the functional changes from rL362687, which was previously reverted. Differential Revision: https://reviews.llvm.org/D61934 llvm-svn: 363364
2019-06-14 17:19:41 +08:00
; CHECK: [[len_minus_sint_max:[^ ]+]] = add nuw nsw i32 %len, -2147483647
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: [[check_len_min_sint_offset:[^ ]+]] = icmp sgt i32 %offset, [[len_minus_sint_max]]
; CHECK: [[safe_offset_mainloop:[^ ]+]] = select i1 [[check_len_min_sint_offset]], i32 %offset, i32 [[len_minus_sint_max]]
; If Offset was a SINT_MIN, we could have an overflow here. That is why we calculated its safe version.
Revert "[SCEV] Use wrap flags in InsertBinop" This reverts commit r362687. Miscompiles llvm-profdata during selfhost. llvm-svn: 362699
2019-06-06 20:35:46 +08:00
; CHECK: [[safe_upper_end:[^ ]+]] = sub i32 %len, [[safe_offset_mainloop]]
[SCEV] Add explicit representations of umin/smin Summary: Currently we express umin as `~umax(~x, ~y)`. However, this becomes a problem for operands in non-integral pointer spaces, because `~x` is not something we can compute for `x` non-integral. However, since comparisons are generally still allowed, we are actually able to express `umin(x, y)` directly as long as we don't try to express is as a umax. Support this by adding an explicit umin/smin representation to SCEV. We do this by factoring the existing getUMax/getSMax functions into a new function that does all four. The previous two functions were largely identical. Reviewed By: sanjoy Differential Revision: https://reviews.llvm.org/D50167 llvm-svn: 360159
2019-05-07 23:28:47 +08:00
; CHECK: [[exit_mainloop_at_cond_loclamp:[^ ]+]] = icmp slt i32 %n, [[safe_upper_end]]
; CHECK: [[exit_mainloop_at_loclamp:[^ ]+]] = select i1 [[exit_mainloop_at_cond_loclamp]], i32 %n, i32 [[safe_upper_end]]
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: [[check_offset_mainloop_2:[^ ]+]] = icmp sgt i32 %offset, 0
; CHECK: [[safe_offset_mainloop_2:[^ ]+]] = select i1 [[check_offset_mainloop_2]], i32 %offset, i32 0
Revert "[SCEV] Use wrap flags in InsertBinop" This reverts commit r362687. Miscompiles llvm-profdata during selfhost. llvm-svn: 362699
2019-06-06 20:35:46 +08:00
; CHECK: [[safe_lower_end:[^ ]+]] = sub i32 2147483647, [[safe_offset_mainloop_2]]
[SCEV] Add explicit representations of umin/smin Summary: Currently we express umin as `~umax(~x, ~y)`. However, this becomes a problem for operands in non-integral pointer spaces, because `~x` is not something we can compute for `x` non-integral. However, since comparisons are generally still allowed, we are actually able to express `umin(x, y)` directly as long as we don't try to express is as a umax. Support this by adding an explicit umin/smin representation to SCEV. We do this by factoring the existing getUMax/getSMax functions into a new function that does all four. The previous two functions were largely identical. Reviewed By: sanjoy Differential Revision: https://reviews.llvm.org/D50167 llvm-svn: 360159
2019-05-07 23:28:47 +08:00
; CHECK: [[exit_mainloop_at_cond_hiclamp:[^ ]+]] = icmp slt i32 [[exit_mainloop_at_loclamp]], [[safe_lower_end]]
; CHECK: [[exit_mainloop_at_hiclamp:[^ ]+]] = select i1 [[exit_mainloop_at_cond_hiclamp]], i32 [[exit_mainloop_at_loclamp]], i32 [[safe_lower_end]]
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: [[exit_mainloop_at_cmp:[^ ]+]] = icmp sgt i32 [[exit_mainloop_at_hiclamp]], 0
; CHECK: [[exit_mainloop_at:[^ ]+]] = select i1 [[exit_mainloop_at_cmp]], i32 [[exit_mainloop_at_hiclamp]], i32 0
; CHECK: mainloop:
; CHECK: br label %loop
; CHECK: loop:
; CHECK: %abc.high = icmp slt i32 %array.idx, %len
; CHECK: %abc.low = icmp sge i32 %array.idx, 0
; CHECK: %abc = and i1 true, true
[SCEV] Add explicit representations of umin/smin Summary: Currently we express umin as `~umax(~x, ~y)`. However, this becomes a problem for operands in non-integral pointer spaces, because `~x` is not something we can compute for `x` non-integral. However, since comparisons are generally still allowed, we are actually able to express `umin(x, y)` directly as long as we don't try to express is as a umax. Support this by adding an explicit umin/smin representation to SCEV. We do this by factoring the existing getUMax/getSMax functions into a new function that does all four. The previous two functions were largely identical. Reviewed By: sanjoy Differential Revision: https://reviews.llvm.org/D50167 llvm-svn: 360159
2019-05-07 23:28:47 +08:00
; CHECK: br i1 %abc, label %in.bounds, label %[[loopexit:[^ ,]+]]
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: in.bounds:
; CHECK: [[continue_mainloop_cond:[^ ]+]] = icmp slt i32 %idx.next, [[exit_mainloop_at]]
; CHECK: br i1 [[continue_mainloop_cond]], label %loop, label %main.exit.selector
; CHECK: main.exit.selector:
; CHECK: [[mainloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.lcssa, %n
; CHECK: br i1 [[mainloop_its_left]], label %main.pseudo.exit, label %exit.loopexit
; CHECK: in.bounds.preloop:
; CHECK: [[continue_preloop_cond:[^ ]+]] = icmp slt i32 %idx.next.preloop, [[exit_preloop_at]]
; CHECK: br i1 [[continue_preloop_cond]], label %loop.preloop, label %preloop.exit.selector
; CHECK: preloop.exit.selector:
; CHECK: [[preloop_its_left:[^ ]+]] = icmp slt i32 %idx.next.preloop.lcssa, %n
; CHECK: br i1 [[preloop_its_left]], label %preloop.pseudo.exit, label %exit.loopexit
; CHECK: in.bounds.postloop:
; CHECK: %next.postloop = icmp slt i32 %idx.next.postloop, %n
; CHECK: br i1 %next.postloop, label %loop.postloop, label %exit.loopexit
!0 = !{i32 0, i32 2147483647}
!1 = !{!"branch_weights", i32 64, i32 4}