[llvm] [llvm][CodeGen] Intrinsic `llvm.powi/ldexp.*` code gen for vector arguments (PR #118242)

[Matt Arsenault via llvm-commits]

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@@ -2572,6 +2572,9 @@ SDValue DAGTypeLegalizer::PromoteIntOp_FRAMERETURNADDR(SDNode *N) {
 }
 
 SDValue DAGTypeLegalizer::PromoteIntOp_ExpOp(SDNode *N) {
+  if (N->getValueType(0).isVector())
+    return DAG.UnrollVectorOp(N);
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arsenm wrote:

This probably shouldn't be the first thing tried. If a vector libcall happens to be available, that would be preferable. Can you move this down before the scalar call is introduced? 

https://github.com/llvm/llvm-project/pull/118242