[PATCH] D102398: [RISCV] Optimize or/xor with immediate

Fri May 14 08:07:24 PDT 2021

benshi001 added a comment.

In D102398#2758657 <https://reviews.llvm.org/D102398#2758657>, @MaskRay wrote:

> Can this be moved into `RISCVTargetLowering::targetShrinkDemandedConstant`? aarch64 has a great `optimizeLogicalImm` which may give some inspiration.

Thanks. I have investigated AArch64's `targetShrinkDemandedConstant` and `optimizeLogicalImm`, but do not think my optimization is suitable to be there.

AArch64's `optimizeLogicalImm` does optimize the immediate operand but does not change the operator.

While my optimization changes the operator or/xor to bseti/binvi.

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https://reviews.llvm.org/D102398