[llvm] [llvm][aarch64] Add support for the MS qualifiers __ptr32, __ptr64, _sptr, __uptr (PR #112793)

[Daniel Paoliello via llvm-commits]

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@@ -23602,12 +23656,28 @@ static SDValue performSTORECombine(SDNode *N,
   SDValue Value = ST->getValue();
   SDValue Ptr = ST->getBasePtr();
   EVT ValueVT = Value.getValueType();
+  EVT MemVT = ST->getMemoryVT();
+  const TargetLowering &TLI = DAG.getTargetLoweringInfo();
+  SDLoc DL(ST);
 
   auto hasValidElementTypeForFPTruncStore = [](EVT VT) {
     EVT EltVT = VT.getVectorElementType();
     return EltVT == MVT::f32 || EltVT == MVT::f64;
   };
 
+  // Cast ptr32 and ptr64 pointers to the default address space before a store.
+  unsigned AddrSpace = ST->getAddressSpace();
+  if (AddrSpace == ARM64AS::PTR64 || AddrSpace == ARM64AS::PTR32_SPTR ||
+      AddrSpace == ARM64AS::PTR32_UPTR) {
+    MVT PtrVT = TLI.getPointerTy(DAG.getDataLayout());
+    if (PtrVT != Ptr.getSimpleValueType()) {
+      SDValue Cast = DAG.getAddrSpaceCast(DL, PtrVT, Ptr, AddrSpace, 0);
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dpaoliello wrote:

Not sure what you mean: we're not changing the address space at this point - after this is handled, the source/dest address space of the operands is unchanged, we've just inserted the appropriate extend/truncation operation.

https://github.com/llvm/llvm-project/pull/112793