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all compute the same value. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43777 91177308-0d34-0410-b5e6-96231b3b80d8
32 lines
662 B
LLVM
32 lines
662 B
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep {phi i32}
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; PR1777
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declare i1 @rrr()
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define i1 @zxcv() {
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entry:
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%a = alloca i32
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%i = ptrtoint i32* %a to i32
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%b = call i1 @rrr()
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br i1 %b, label %one, label %two
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one:
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%x = phi i32 [%i, %entry], [%y, %two]
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%c = call i1 @rrr()
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br i1 %c, label %two, label %end
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two:
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%y = phi i32 [%i, %entry], [%x, %one]
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%d = call i1 @rrr()
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br i1 %d, label %one, label %end
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end:
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%f = phi i32 [ %x, %one], [%y, %two]
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; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
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; even though %f must equal %i at this point
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%g = inttoptr i32 %f to i32*
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store i32 10, i32* %g
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%z = call i1 @rrr()
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ret i1 %z
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}
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