[llvm] [LoongArch] Load floating-point immediate using VLDI (PR #101923)

[Lu Weining via llvm-commits]

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@@ -5573,14 +5573,31 @@ SDValue LoongArchTargetLowering::LowerReturn(
   return DAG.getNode(LoongArchISD::RET, DL, MVT::Other, RetOps);
 }
 
+bool LoongArchTargetLowering::isFPImmVLDILegal(const APFloat &Imm,
+                                               EVT VT) const {
+  if (!Subtarget.hasExtLSX())
+    return false;
+
+  uint64_t val = Imm.bitcastToAPInt().getZExtValue();
+  if (VT == MVT::f32) {
+    uint64_t masked = val & 0x7e07ffff;
+    return (masked == 0x3e000000 || masked == 0x40000000);
+  } else if (VT == MVT::f64) {
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SixWeining wrote:

else-after-return
https://llvm.org/docs/CodingStandards.html#don-t-use-else-after-a-return

https://github.com/llvm/llvm-project/pull/101923