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Added ROLW/RORW/SLLW/SRAW/SRLW for canCreateUndefOrPoisonForTargetNode #152609

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Added ROLW/RORW/SLLW/SRAW/SRLW for canCreateUndefOrPoisonForTargetNode #152609

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8 changes: 8 additions & 0 deletions llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -21477,6 +21477,14 @@ bool RISCVTargetLowering::canCreateUndefOrPoisonForTargetNode(

// TODO: Add more target nodes.
switch (Op.getOpcode()) {
case RISCVISD::SLLW:
case RISCVISD::SRAW:
case RISCVISD::SRLW:
case RISCVISD::RORW:
case RISCVISD::ROLW:
// Only the lower 5 bits of RHS are read, guaranteeing the rotate/shift
// amount is bounds.
return false;
case RISCVISD::SELECT_CC:
// Integer select_cc cannot create poison.
// TODO: What are the FP poison semantics?
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