| Issue |
149285
|
| Summary |
[RISCV] canCreateUndefOrPoisonForTargetNode - can ROLW/RORW + SLLW/SRAW/SRLW create undef/poison?
|
| Labels |
backend:RISC-V
|
| Assignees |
|
| Reporter |
RKSimon
|
AFAICT the RISCV spec states the rotate/shift amounts are always `amt & 31` modulo so there are no out of bound shift amounts that can create poison.
We already say ISD::ROTL/ROTR can't create undef/poison for the same reason, so RISCISD::ROLW/RORW should be OK, but its whether everyone is happy to handle SLLW/SRAW/SRLW similarly.
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