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[RISCV] Remove dead code from doPeepholeMaskedRVV [nfc]

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This is after lowering of undef to IMPLICIT_DEF, so the condition is always false.  Rather than fixing the intent (which was to match implicit_def per the comment), just delete it.  We're in the process of migrating away from the TA pseudos, so using _TA more often is fine.
This commit is contained in:
Philip Reames 2023-06-14 12:57:49 -07:00 committed by Philip Reames
parent 43593a0a14
commit c4a3bd7f8b
1 changed files with 5 additions and 8 deletions
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13
llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
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@ -3193,14 +3193,11 @@ bool RISCVDAGToDAGISel::doPeepholeMaskedRVV(SDNode *N) {
TailPolicyOpIdx = getVecPolicyOpIdx(N, MaskedMCID);
if (!(N->getConstantOperandVal(*TailPolicyOpIdx) &
RISCVII::TAIL_AGNOSTIC)) {
// We can't use TA if the tie-operand is not IMPLICIT_DEF
if (!N->getOperand(0).isUndef()) {
// Keep the true-masked instruction when there is no unmasked TU
// instruction
if (I->UnmaskedTUPseudo == I->MaskedPseudo)
return false;
UseTUPseudo = true;
}
// Keep the true-masked instruction when there is no unmasked TU
// instruction
if (I->UnmaskedTUPseudo == I->MaskedPseudo)
return false;
UseTUPseudo = true;
}
}
}