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

[zhijian lin via cfe-commits]

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@@ -271,22 +271,33 @@ namespace {
 class PPC32_SVR4_ABIInfo : public DefaultABIInfo {
   bool IsSoftFloatABI;
   bool IsRetSmallStructInRegABI;
+  bool isComplexInRegABI;
+  // Size of GPR in bits
+  unsigned RLen;
+  static const int NumArgGPRs = 8;
 
   CharUnits getParamTypeAlignment(QualType Ty) const;
+  ABIArgInfo handleComplex(QualType Ty, uint64_t &TypeSize) const;
 
 public:
   PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI,
-                     bool RetSmallStructInRegABI)
+                     bool RetSmallStructInRegABI, unsigned RLen,
+                     bool ComplexInRegABI)
       : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI),
-        IsRetSmallStructInRegABI(RetSmallStructInRegABI) {}
+        IsRetSmallStructInRegABI(RetSmallStructInRegABI),
+        isComplexInRegABI(ComplexInRegABI), RLen(RLen) {}
 
   ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty, int &ArgGPRsLeft) const;
 
   void computeInfo(CGFunctionInfo &FI) const override {
+
+    int ArgGPRsLeft = NumArgGPRs;
+
     if (!getCXXABI().classifyReturnType(FI))
       FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
     for (auto &I : FI.arguments())
-      I.info = classifyArgumentType(I.type);
+      I.info = classifyArgumentType(I.type, ArgGPRsLeft);
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diggerlin wrote:

why do you need  introduce a new variable `ArgGPRsLeft` since you do not use the new variable after the call .

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