[llvm] [llvm][RISCV] Optimize fcopysign for fixed vectors (PR #193802)

[Brandon Wu via llvm-commits]

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@@ -1679,7 +1679,7 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
           }
           setOperationAction(ISD::FNEG, VT, Expand);
           setOperationAction(ISD::FABS, VT, Expand);
-          setOperationAction(ISD::FCOPYSIGN, VT, Expand);
+          setOperationAction(ISD::FCOPYSIGN, VT, Custom);
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4vtomat wrote:

Umm, I think they are essentially same code, but I think yeah we should only handle those illegal promoted type only as mentioned in commit message😅

https://github.com/llvm/llvm-project/pull/193802