[clang] [Sparc][clang] make `_Complex` ABI GCC-compatible (PR #212340)

[via cfe-commits]

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@@ -277,6 +313,22 @@ ABIArgInfo SparcV9ABIInfo::classifyType(QualType Ty, unsigned SizeLimit,
       return ABIArgInfo::getExtend(Ty);
     }
 
+  // When being GCC-compatible, cast a complex char, short and int to an integer
+  // type of the right size to get the correct scalar-like behavior. Other
+  // complex types fall through and are treated like a struct containing the
+  // real and imaginary parts, e.g. `{ i64, i64 }` or `{ double, double }`.
+  if (IsComplexGnuABI) {
+    const auto *CT = Ty->getAs<ComplexType>();
+    if (CT && CT->getElementType()->isIntegerType()) {
+      uint64_t ElementTypeSize = Context.getTypeSize(CT->getElementType());
+      if (ElementTypeSize < 32) {
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koachan wrote:

AFAIK `int` will have ElementTypeSize == 32 right?
Don't we need to extend it?

https://github.com/llvm/llvm-project/pull/212340