[llvm] [SelectionDAG] Fix load/store legalization for softened x86_fp80 (PR #209991)

[Muhammed Shiyas N via llvm-commits]

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@@ -1016,10 +1016,19 @@ SDValue DAGTypeLegalizer::SoftenFloatRes_LOAD(SDNode *N) {
       ~(MachineMemOperand::MOInvariant | MachineMemOperand::MODereferenceable);
   SDValue NewL;
   if (L->getExtensionType() == ISD::NON_EXTLOAD) {
-    NewL = DAG.getLoad(L->getAddressingMode(), L->getExtensionType(), NVT, dl,
-                       L->getChain(), L->getBasePtr(), L->getOffset(),
-                       L->getPointerInfo(), NVT, L->getBaseAlign(), MMOFlags,
-                       L->getAAInfo());
+    // If softening widens the integer representation (e.g. x86_fp80 -> i96),
+    // load the original memory width and extend to the softened type.
+    EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits());
+    if (NVT.bitsGT(MemVT))
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Shiyas-N wrote:

updated to use single getLoad() call

https://github.com/llvm/llvm-project/pull/209991