[PATCH] D95214: [RISCV]A bug when llc -O0 vfmv.f.s.ll

Fri Jan 22 19:25:15 PST 2021

StephenFan added a comment.

In D95214#2517277 <https://reviews.llvm.org/D95214#2517277>, @craig.topper wrote:

> @StephenFan  thank you for the bug report. I had a feeling that converting FPR32 to FPR64 with a SUBREG_TO_REG could cause a problem.

I have a question that why not make the scalar float point as FPR64 (not FPR32) then when encounter the FPR32  or FPR16, use the EXTRACT_SUBREG opcode.

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https://reviews.llvm.org/D95214