1469d82e1c
As defined in LangRef, branching on `undef` is undefined behavior. This PR aims to remove undefined behavior from tests. As UB tests break Alive2 and may be the root cause of breaking future optimizations. Here's an Alive2 proof for one of the examples: https://alive2.llvm.org/ce/z/TncxhP
35 lines
904 B
LLVM
35 lines
904 B
LLVM
; RUN: opt -disable-output -debug-pass-manager \
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; RUN: -passes='no-op-loopnest' %s 2>&1 \
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; RUN: | FileCheck %s
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; @f()
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; / \
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; loop.0 loop.1
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; / \ \
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; loop.0.0 loop.0.1 loop.1.0
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;
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; CHECK: Running pass: NoOpLoopNestPass on loop %loop.0 in function f
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; CHECK: Running pass: NoOpLoopNestPass on loop %loop.1 in function f
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; CHECK-NOT: Running pass: NoOpLoopNestPass on {{loop\..*\..*}}
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define void @f(i1 %arg) {
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entry:
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br label %loop.0
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loop.0:
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br i1 %arg, label %loop.0.0, label %loop.1
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loop.0.0:
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br i1 %arg, label %loop.0.0, label %loop.0.1
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loop.0.1:
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br i1 %arg, label %loop.0.1, label %loop.0
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loop.1:
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br i1 %arg, label %loop.1, label %loop.1.bb1
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loop.1.bb1:
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br i1 %arg, label %loop.1, label %loop.1.bb2
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loop.1.bb2:
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br i1 %arg, label %end, label %loop.1.0
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loop.1.0:
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br i1 %arg, label %loop.1.0, label %loop.1
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end:
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ret void
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}
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