f066d7504e
This patch relands https://github.com/llvm/llvm-project/pull/124270. Closes https://github.com/llvm/llvm-project/issues/126409. The root cause is that we incorrectly preserve the samesign flag after truncating operands of an icmp: https://alive2.llvm.org/ce/z/4NE9gS --------- Co-authored-by: Ramkumar Ramachandra <ramkumar.ramachandra@codasip.com>
32 lines
1.0 KiB
LLVM
32 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes=indvars < %s | FileCheck %s
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define void @pr126409() {
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; CHECK-LABEL: define void @pr126409() {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[X:%.*]] = xor i32 0, 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp samesign ult i32 [[X]], 155
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; CHECK-NEXT: br i1 [[CMP]], label %[[FOR_BODY_PREHEADER:.*]], label %[[IF_END:.*]]
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; CHECK: [[FOR_BODY_PREHEADER]]:
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; CHECK-NEXT: br label %[[FOR_BODY:.*]]
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; CHECK: [[FOR_BODY]]:
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; CHECK-NEXT: br i1 false, label %[[FOR_BODY]], label %[[IF_END_LOOPEXIT:.*]]
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; CHECK: [[IF_END_LOOPEXIT]]:
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; CHECK-NEXT: br label %[[IF_END]]
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; CHECK: [[IF_END]]:
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; CHECK-NEXT: ret void
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;
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entry:
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%x = xor i32 0, 1
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%cmp = icmp samesign ult i32 %x, 155
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br i1 %cmp, label %for.body, label %if.end
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for.body:
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%phi = phi i8 [ 1, %for.body ], [ 0, %entry ]
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%cmp2 = icmp slt i8 %phi, 1
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br i1 %cmp2, label %for.body, label %if.end
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if.end:
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ret void
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}
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