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https://github.com/c64scene-ar/llvm-6502.git
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8d5e4e48bc
This previously caused miscompilations as a result of phi nodes receiving undef incoming values from blocks dominated by such successors. Differential Revision: http://reviews.llvm.org/D10726 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240670 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
657 B
LLVM
39 lines
657 B
LLVM
; RUN: opt -gvn -S -o - %s | FileCheck %s
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; If a branch has two identical successors, we cannot declare either dead.
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define void @widget(i1 %p) {
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entry:
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br label %bb2
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bb2:
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%t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ]
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%t2 = add i64 %t1, 1
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%t3 = icmp ult i64 0, %t2
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br i1 %t3, label %bb3, label %bb4
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bb3:
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%t4 = call i64 @f()
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br label %bb4
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bb4:
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; CHECK-NOT: phi {{.*}} undef
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%foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ]
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br i1 %p, label %bb5, label %bb6
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bb5:
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br i1 true, label %bb7, label %bb7
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bb6:
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br i1 true, label %bb7, label %bb7
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bb7:
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%t5 = add i64 %t1, 1
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br i1 %p, label %bb2, label %bb8
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bb8:
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ret void
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}
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declare i64 @f()
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