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nodes unless we KNOW that we are able to promote all of them. In this case promoting the phi to a select is silly because we will always have to do the call conditionally. As such, select promotion is actually a pessimization. llvm-svn: 16972
30 lines
713 B
LLVM
30 lines
713 B
LLVM
; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep select
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;; The PHI node in this example should not be turned into a select, as we are
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;; not able to ifcvt the entire block. As such, converting to a select just
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;; introduces inefficiency without saving copies.
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int %bar(bool %C) {
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entry:
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br bool %C, label %then, label %endif
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then:
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%tmp.3 = call int %qux()
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br label %endif
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endif:
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%R = phi int [123, %entry], [12312, %then]
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;; stuff to disable tail duplication
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call int %qux()
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call int %qux()
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call int %qux()
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call int %qux()
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call int %qux()
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call int %qux()
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call int %qux()
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ret int %R
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}
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declare int %qux()
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