[flang] Add 32-bit AIX target specific in order to build 32-bit flang-rt (#136051)

Author: DanielCChen

Diff for: flang/lib/Optimizer/CodeGen/Target.cpp

@@ -1020,6 +1020,37 @@ struct TargetAArch64 : public GenericTarget<TargetAArch64> {
 };
 } // namespace
 
+//===----------------------------------------------------------------------===//
+// PPC (AIX 32 bit) target specifics.
+//===----------------------------------------------------------------------===//
+namespace {
+struct TargetPPC : public GenericTarget<TargetPPC> {
+  using GenericTarget::GenericTarget;
+
+  static constexpr int defaultWidth = 32;
+
+  CodeGenSpecifics::Marshalling
+  complexArgumentType(mlir::Location, mlir::Type eleTy) const override {
+    CodeGenSpecifics::Marshalling marshal;
+    // two distinct element type arguments (re, im)
+    marshal.emplace_back(eleTy, AT{});
+    marshal.emplace_back(eleTy, AT{});
+    return marshal;
+  }
+
+  CodeGenSpecifics::Marshalling
+  complexReturnType(mlir::Location, mlir::Type eleTy) const override {
+    CodeGenSpecifics::Marshalling marshal;
+    // Use a type that will be translated into LLVM as:
+    // { t, t }   struct of 2 element type
+    marshal.emplace_back(
+        mlir::TupleType::get(eleTy.getContext(), mlir::TypeRange{eleTy, eleTy}),
+        AT{});
+    return marshal;
+  }
+};
+} // namespace
+
 //===----------------------------------------------------------------------===//
 // PPC64 (AIX 64 bit) target specifics.
 //===----------------------------------------------------------------------===//
@@ -1847,6 +1878,9 @@ fir::CodeGenSpecifics::get(mlir::MLIRContext *ctx, llvm::Triple &&trp,
   case llvm::Triple::ArchType::aarch64:
     return std::make_unique<TargetAArch64>(
         ctx, std::move(trp), std::move(kindMap), targetCPU, targetFeatures, dl);
+  case llvm::Triple::ArchType::ppc:
+    return std::make_unique<TargetPPC>(ctx, std::move(trp), std::move(kindMap),
+                                       targetCPU, targetFeatures, dl);
   case llvm::Triple::ArchType::ppc64:
     return std::make_unique<TargetPPC64>(
         ctx, std::move(trp), std::move(kindMap), targetCPU, targetFeatures, dl);

Diff for: flang/test/Fir/comdat.fir

@@ -3,6 +3,7 @@
 // RUN: fir-opt %s --fir-to-llvm-ir="target=x86_64-pc-windows-msvc" | FileCheck %s --check-prefixes="CHECK-COMDAT"
 // RUN: fir-opt %s --fir-to-llvm-ir="target=aarch64-apple-darwin" | FileCheck %s --check-prefixes="CHECK-NOCOMDAT"
 // RUN: fir-opt %s --fir-to-llvm-ir="target=powerpc64-ibm-aix" | FileCheck %s --check-prefixes="CHECK-NOCOMDAT"
+// RUN: fir-opt %s --fir-to-llvm-ir="target=powerpc-ibm-aix" | FileCheck %s --check-prefixes="CHECK-NOCOMDAT"
 
 // CHECK-COMDAT: llvm.func linkonce @fun_linkonce(%arg0: i32) -> i32 comdat(@__llvm_comdat::@fun_linkonce)
 // CHECK-NOCOMDAT: llvm.func linkonce @fun_linkonce(%arg0: i32) -> i32 {
@@ -38,4 +39,4 @@ fir.global linkonce @global_linkonce constant : i32 {
 fir.global linkonce_odr @global_linkonce_odr constant : i32 {
   %0 = arith.constant 0 : i32
   fir.has_value %0 : i32
-}
+}