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d9e087bbc3
The pattern "A&(A^B) -> A & ~B" recreated itself because ~B is actually a xor -1. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125557 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
819 B
LLVM
20 lines
819 B
LLVM
; This testcase causes an infinite loop in the instruction combiner,
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; because it changes a pattern and the original pattern is almost
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; identical to the newly-generated pattern.
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; RUN: opt < %s -instcombine -disable-output
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;PR PR9216
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target triple = "x86_64-unknown-linux-gnu"
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define <4 x float> @m_387(i8* noalias nocapture %A, i8* nocapture %B, <4 x i1> %C) nounwind {
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entry:
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%movcsext20 = sext <4 x i1> %C to <4 x i32>
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%tmp2389 = xor <4 x i32> %movcsext20, <i32 -1, i32 -1, i32 -1, i32 -1>
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%movcand25 = and <4 x i32> %tmp2389, <i32 undef, i32 undef, i32 undef, i32 -1>
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%movcor26 = or <4 x i32> %movcand25, zeroinitializer
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%L2 = bitcast <4 x i32> %movcor26 to <4 x float>
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%L3 = shufflevector <4 x float> zeroinitializer, <4 x float> %L2, <4 x i32> <i32 0, i32 1, i32 2, i32 7>
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ret <4 x float> %L3
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}
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