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[X86][AVX] lowerShuffleAsLanePermuteAndSHUFP - only set the demanded elements of the lane mask.

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Fixes an cyclic dependency issue with an upcoming patch where getVectorShuffle canonicalizes masks with splat build vector sources.
This commit is contained in:
Simon Pilgrim 2020-01-12 09:41:40 +00:00
parent f9acff790a
commit 14db9ee673
1 changed files with 1 additions and 2 deletions
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3
lib/Target/X86/X86ISelLowering.cpp
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@ -14907,8 +14907,7 @@ static SDValue lowerShuffleAsLanePermuteAndSHUFP(const SDLoc &DL, MVT VT,
continue;
int LaneBase = i & ~1;
auto &LaneMask = (i & 1) ? RHSMask : LHSMask;
LaneMask[LaneBase + 0] = (M & ~1);
LaneMask[LaneBase + 1] = (M & ~1) + 1;
LaneMask[LaneBase + (M & 1)] = M;
SHUFPMask |= (M & 1) << i;
}