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[X86] getFauxShuffleMask - use std::iota for insert_subvector shuffle mask population. NFC.

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This commit is contained in:
Simon Pilgrim 2025-04-09 12:51:39 +01:00
parent a6edaeb824
commit 2896bbe148
1 changed files with 4 additions and 5 deletions
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9
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -6180,7 +6180,7 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
uint64_t InsertIdx = N.getConstantOperandVal(2);
// Subvector isn't demanded - just return the base vector.
if (DemandedElts.extractBits(NumSubElts, InsertIdx) == 0) {
Mask.resize(NumElts, SM_SentinelUndef);
Mask.resize(NumElts);
std::iota(Mask.begin(), Mask.end(), 0);
Ops.push_back(Src);
return true;
@ -6194,10 +6194,9 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
Src.getConstantOperandVal(2) == 0 &&
(NumBitsPerElt == 64 || Src.getOperand(1) == Sub) &&
SDNode::areOnlyUsersOf({N.getNode(), Src.getNode()}, Sub.getNode())) {
for (int i = 0; i != (int)NumSubElts; ++i)
Mask.push_back(i);
for (int i = 0; i != (int)NumSubElts; ++i)
Mask.push_back(i + NumElts);
Mask.resize(NumElts);
std::iota(Mask.begin(), Mask.begin() + NumSubElts, 0);
std::iota(Mask.begin() + NumSubElts, Mask.end(), NumElts);
Ops.push_back(Src.getOperand(1));
Ops.push_back(Sub);
return true;