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5ea27d820a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11495 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
843 B
LLVM
33 lines
843 B
LLVM
; The unify-function-exit-nodes pass often makes basic blocks that just contain
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; a PHI node and a return. Make sure the simplify cfg can straighten out this
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; important case. This is basically the most trivial form of tail-duplication.
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; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep 'br label'
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int %test(bool %B, int %A, int %B) {
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br bool %B, label %T, label %F
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T:
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br label %ret
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F:
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br label %ret
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ret:
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%X = phi int [%A, %F], [%B, %T]
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ret int %X
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}
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; Make sure it's willing to move unconditional branches to return instructions
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; as well, even if the return block is shared and the source blocks are
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; non-empty.
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int %test2(bool %B, int %A, int %B) {
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br bool %B, label %T, label %F
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T:
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call int %test(bool true, int 5, int 8)
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br label %ret
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F:
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call int %test(bool true, int 5, int 8)
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br label %ret
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ret:
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ret int %A
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}
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