247016a735
We can use the same input for both operands to get a free compare with zero. We already use this trick in a couple places where we explicitly create PTESTM with the same input twice. This generalizes it. I'm hoping to remove the ISD opcodes and move this to isel patterns like we do for scalar cmp/test. llvm-svn: 323605
14 lines
508 B
LLVM
14 lines
508 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown -mcpu=skx | FileCheck %s
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define <2 x i48> @PR35272(<2 x i64> %a0, <2 x i48> %a1, <2 x i48> %a2) {
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; CHECK-LABEL: PR35272:
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; CHECK: # %bb.0:
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; CHECK-NEXT: vptestnmq %xmm0, %xmm0, %k1
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; CHECK-NEXT: vpblendmq %xmm1, %xmm2, %xmm0 {%k1}
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; CHECK-NEXT: retq
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%1 = icmp eq <2 x i64> %a0, zeroinitializer
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%2 = select <2 x i1> %1, <2 x i48> %a1, <2 x i48> %a2
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ret <2 x i48> %2
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}
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