84733b0f17
Reproducer:
; RUN: opt -S -jump-threading < %s
define void @test() {
entry:
br i1 false, label %loop, label %exit
loop:
%bool = phi i1 [ %xor, %loop.latch ], [ false, %entry ]
%cmp = icmp eq i16 0, 1
%xor = xor i1 %cmp, %bool
br i1 %bool, label %loop.latch, label %exit
loop.latch:
%dummy = phi i16 [ 0, %loop ]
br label %loop
exit:
ret void
}
On this occassion, phi node %bool is actually %xor, and doing substitution causes assertion failure.
Fixes: https://github.com/llvm/llvm-project/issues/58812
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D139783
34 lines
877 B
LLVM
34 lines
877 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=jump-threading %s | FileCheck %s
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; https://github.com/llvm/llvm-project/issues/58812
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define void @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[EXIT:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[DUMMY:%.*]] = phi i16 [ 0, [[LOOP:%.*]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i16 0, 1
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; CHECK-NEXT: [[XOR:%.*]] = xor i1 false, [[XOR]]
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; CHECK-NEXT: br i1 [[XOR]], label [[LOOP]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br i1 false, label %loop, label %exit
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loop:
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%bool = phi i1 [ %xor, %loop.latch ], [ false, %entry ]
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%cmp = icmp eq i16 0, 1
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%xor = xor i1 %cmp, %bool
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br i1 %bool, label %loop.latch, label %exit
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loop.latch:
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%dummy = phi i16 [ 0, %loop ]
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br label %loop
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exit:
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ret void
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}
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