forked from OSchip/llvm-project
20 lines
868 B
LLVM
20 lines
868 B
LLVM
; RUN: llc -mattr=+ssse3 -mtriple=x86_64-unknown-unknown < %s | FileCheck %s
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; The pshufb from function @pr24562 was wrongly folded into its first operand
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; as a result of a late target shuffle combine on the legalized selection dag.
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;
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; Check that the pshufb is correctly folded to a zero vector.
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define <2 x i64> @pr24562() {
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; CHECK-LABEL: pr24562:
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; CHECK: # BB#0: # %entry
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; CHECK-NEXT: xorps %xmm0, %xmm0
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; CHECK-NEXT: retq
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entry:
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%0 = call <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>, <16 x i8> <i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1, i8 -1>) #2
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%1 = bitcast <16 x i8> %0 to <2 x i64>
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ret <2 x i64> %1
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}
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declare <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8>, <16 x i8>)
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