[llvm] [RISCV] Lower vector UINT_TO_FP i1 to VSELECT 1.0/0.0 (PR #219426)

[Craig Topper via llvm-commits]

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@@ -8521,6 +8521,16 @@ SDValue RISCVTargetLowering::LowerOperation(SDValue Op,
     return lowerStrictFPExtendOrRoundLike(Op, DAG);
   case ISD::SINT_TO_FP:
   case ISD::UINT_TO_FP:
+    // An unsigned i1-to-fp conversion is equivalent to selecting between
+    // 1.0 and 0.0. This avoids extending the mask before converting it.
+    if (Op.getOpcode() == ISD::UINT_TO_FP && Op.getValueType().isVector() &&
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topperc wrote:

Can we do something similar for SINT_TO_FP with -1.0 and 0.0?

https://github.com/llvm/llvm-project/pull/219426