[clang] [clang][PowerPC] Add flag to enable compatibility with GNU for complex arguments (PR #77732)

[Kishan Parmar via cfe-commits]

================
@@ -337,12 +350,77 @@ CharUnits PPC32_SVR4_ABIInfo::getParamTypeAlignment(QualType Ty) const {
   return CharUnits::fromQuantity(4);
 }
 
+ABIArgInfo PPC32_SVR4_ABIInfo::handleComplex(QualType Ty,
+                                             uint64_t &TypeSize) const {
+
+  assert(Ty->isAnyComplexType());
+  llvm::Type *ElemTy;
+  unsigned SizeRegs;
+
+  if (TypeSize == 64) {
+    ElemTy = llvm::Type::getInt64Ty(getVMContext());
+    SizeRegs = 1;
+  } else {
+    ElemTy = llvm::Type::getInt32Ty(getVMContext());
----------------
Long5hot wrote:

Reason for using llvm::Type::getInt64Ty(getVMContext()) for floats here was to follow ABI ATR-PASS-COMPLEX-IN-GPRS

> complex single-precision float : If gr is even, set gr = gr + 1. Load the lower-addressed word of the
> argument into gr and the higher-addressed word into gr + 1, set gr = gr + 2.
> 
> complex double-precision float: Load the words of the argument, in memory-address order, into gr, gr + 1,
> gr + 2 and gr + 3, set gr = gr + 4.

You can check the previous discussion here. : https://reviews.llvm.org/D146942

https://github.com/llvm/llvm-project/pull/77732