[llvm] [TargetLowering] Lower ldexp into target supported instructions (PR #67552)

[via llvm-commits]

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@@ -26360,3 +26367,39 @@ bool AArch64TargetLowering::preferScalarizeSplat(SDNode *N) const {
   }
   return true;
 }
+
+SDValue AArch64TargetLowering::LowerFLDEXP(SDValue Op,
+                                           SelectionDAG &DAG) const {
+  SDValue X = Op.getOperand(0);
+  EVT XScalarTy = X.getValueType();
+  SDValue Exp = Op.getOperand(1);
+
+  SDLoc DL(Op);
+  EVT XVT, ExpVT;
+  switch (Op.getValueSizeInBits()) {
+  default:
+    return SDValue();
+  case 32:
+    XVT = MVT::nxv4f32;
+    ExpVT = MVT::nxv4i32;
+    break;
+  case 64:
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huhu233 wrote:

You are right, but it seems `f16` for `ldexp` is not fully supported? I got some compile failures as shown, 
https://godbolt.org/



https://github.com/llvm/llvm-project/pull/67552