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[X86][SSE] combineShuffleWithHorizOp - avoid unnecessary subtraction. NFCI. 

We can safely replace ((M - NumElts) % NumEltsPerLane) with (M % NumEltsPerLane) as the modulo result will be the same.
This commit is contained in:
Simon Pilgrim 2020-08-11 16:42:37 +01:00
parent c135744b1d
commit fe1f36986b
1 changed files with 1 additions and 1 deletions
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2
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -35900,7 +35900,7 @@ static SDValue combineShuffleWithHorizOp(SDValue N, MVT VT, const SDLoc &DL,
(M % NumEltsPerLane) >= NumHalfEltsPerLane)
M -= NumHalfEltsPerLane;
if (NumElts <= M && BC1.getOperand(0) == BC1.getOperand(1) &&
((M - NumElts) % NumEltsPerLane) >= NumHalfEltsPerLane)
(M % NumEltsPerLane) >= NumHalfEltsPerLane)
M -= NumHalfEltsPerLane;
}
}