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[X86][SSE] Add missing comment describing combing to SHUFPS. NFCI
author
Simon Pilgrim
<llvm-dev@redking.me.uk>
Fri, 10 Feb 2017 13:16:01 +0000
(13:16 +0000)
committer
Simon Pilgrim
<llvm-dev@redking.me.uk>
Fri, 10 Feb 2017 13:16:01 +0000
(13:16 +0000)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294745
91177308
-0d34-0410-b5e6-
96231b3b80d8
lib/Target/X86/X86ISelLowering.cpp
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diff --git
a/lib/Target/X86/X86ISelLowering.cpp
b/lib/Target/X86/X86ISelLowering.cpp
index
86b78fe
..
4fddf3f
100644
(file)
--- a/
lib/Target/X86/X86ISelLowering.cpp
+++ b/
lib/Target/X86/X86ISelLowering.cpp
@@
-26759,6
+26759,8
@@
static bool matchBinaryPermuteVectorShuffle(MVT MaskVT, ArrayRef<int> Mask,
(MaskVT == MVT::v16f32 && Subtarget.hasAVX512())) {
SmallVector<int, 4> RepeatedMask;
if (isRepeatedTargetShuffleMask(128, MaskVT, Mask, RepeatedMask)) {
+ // Match each half of the repeated mask, to determine if its just
+ // referencing one of the vectors, is zeroable or entirely undef.
auto MatchHalf = [&](unsigned Offset, int &S0, int &S1) {
int M0 = RepeatedMask[Offset];
int M1 = RepeatedMask[Offset + 1];