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[X86] canCreateUndefOrPoisonForTargetNode - add SSE bit logic + VPTERNLOG handling #155600

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Merged
merged 1 commit into from
Aug 27, 2025
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[X86] canCreateUndefOrPoisonForTargetNode - add SSE bit logic + VPTERNLOG handling #155600

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8 changes: 8 additions & 0 deletions llvm/lib/Target/X86/X86ISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45150,6 +45150,14 @@ bool X86TargetLowering::canCreateUndefOrPoisonForTargetNode(
bool PoisonOnly, bool ConsiderFlags, unsigned Depth) const {

switch (Op.getOpcode()) {
// SSE bit logic.
case X86ISD::FAND:
case X86ISD::FOR:
case X86ISD::FXOR:
case X86ISD::FANDN:
case X86ISD::ANDNP:
case X86ISD::VPTERNLOG:
return false;
// SSE vector insert/extracts use modulo indices.
case X86ISD::PINSRB:
case X86ISD::PINSRW:
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