[llvm] [Legalizer] Soften EXTRACT_ELEMENT on ppcf128 (PR #77412)

[Qiu Chaofan via llvm-commits]

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@@ -262,6 +264,16 @@ SDValue DAGTypeLegalizer::SoftenFloatRes_ConstantFP(SDNode *N) {
   }
 }
 
+SDValue DAGTypeLegalizer::SoftenFloatRes_EXTRACT_ELEMENT(SDNode *N) {
+  SDValue Src = N->getOperand(0);
+  assert(Src.getValueType() == MVT::ppcf128 &&
+         Src.getOperand(0)->getOpcode() == ISD::BUILD_PAIR &&
+         "In floats only ppcf128 can be extracted by element!");
+  EVT DestVT = EVT::getIntegerVT(*DAG.getContext(), N->getValueSizeInBits(0));
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ecnelises wrote:

(see log above) here we are softening float types, they need to be bitcasted to integer as no float register exists in soft float mode

https://github.com/llvm/llvm-project/pull/77412