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

[Craig Topper via llvm-commits]

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@@ -4648,6 +4648,24 @@ void SelectionDAGLegalize::ConvertNodeToLibcall(SDNode *Node) {
     bool ExponentHasSizeOfInt =
         DAG.getLibInfo().getIntSize() ==
         Node->getOperand(1 + Offset).getValueType().getSizeInBits();
+    if (!ExponentHasSizeOfInt) {
+      // In some backends, such as RISCV64 and LoongArch64, the i32 type is
+      // illegal and is promoted by previous process. For such cases, the
+      // exponent actually matches with sizeof(int) and a libcall should be
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topperc wrote:

Why would it be 8? getIntSize is in bits and `int` on RISCV64 is 32 bits.

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