Index: clang/include/clang/Basic/CodeGenOptions.def
===================================================================
--- clang/include/clang/Basic/CodeGenOptions.def
+++ clang/include/clang/Basic/CodeGenOptions.def
@@ -228,6 +228,9 @@
   /// If -fpcc-struct-return or -freg-struct-return is specified.
 ENUM_CODEGENOPT(StructReturnConvention, StructReturnConventionKind, 2, SRCK_Default)
 
+  /// If -fcomplex-ppc-gnu-abi for ppc32
+ENUM_CODEGENOPT(ComplexInRegABI, bool, 1,false)
+
 CODEGENOPT(RelaxAll          , 1, 0) ///< Relax all machine code instructions.
 CODEGENOPT(RelaxedAliasing   , 1, 0) ///< Set when -fno-strict-aliasing is enabled.
 CODEGENOPT(StructPathTBAA    , 1, 0) ///< Whether or not to use struct-path TBAA.
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2095,6 +2095,9 @@
   HelpText<"Form fused FP ops (e.g. FMAs)">,
   Values<"fast,on,off,fast-honor-pragmas">;
 
+def fcomplex_ppc_gnu_abi : Flag<["-"], "fcomplex-ppc-gnu-abi">, Group<f_Group>, Flags<[CC1Option]>,
+  DocBrief<"Follow the GNU ABI, store Complex values in GPR instead of stack for PowerPC-32.">,
+  HelpText<"Store Complex values in GPR instead of Stack for PowerPC-32.">;
 defm strict_float_cast_overflow : BoolFOption<"strict-float-cast-overflow",
   CodeGenOpts<"StrictFloatCastOverflow">, DefaultTrue,
   NegFlag<SetFalse, [CC1Option], "Relax language rules and try to match the behavior"
Index: clang/lib/CodeGen/Targets/PPC.cpp
===================================================================
--- clang/lib/CodeGen/Targets/PPC.cpp
+++ clang/lib/CodeGen/Targets/PPC.cpp
@@ -271,16 +271,21 @@
 class PPC32_SVR4_ABIInfo : public DefaultABIInfo {
   bool IsSoftFloatABI;
   bool IsRetSmallStructInRegABI;
+  bool isComplexInRegABI;
 
   CharUnits getParamTypeAlignment(QualType Ty) const;
+  ABIArgInfo handleComplex(QualType Ty) const;
 
 public:
   PPC32_SVR4_ABIInfo(CodeGen::CodeGenTypes &CGT, bool SoftFloatABI,
-                     bool RetSmallStructInRegABI)
+                     bool RetSmallStructInRegABI,
+                     bool ComplexInRegABI)
       : DefaultABIInfo(CGT), IsSoftFloatABI(SoftFloatABI),
-        IsRetSmallStructInRegABI(RetSmallStructInRegABI) {}
+        IsRetSmallStructInRegABI(RetSmallStructInRegABI),
+        isComplexInRegABI(ComplexInRegABI) {}
 
   ABIArgInfo classifyReturnType(QualType RetTy) const;
+  ABIArgInfo classifyArgumentType(QualType Ty) const;
 
   void computeInfo(CGFunctionInfo &FI) const override {
     if (!getCXXABI().classifyReturnType(FI))
@@ -296,9 +301,11 @@
 class PPC32TargetCodeGenInfo : public TargetCodeGenInfo {
 public:
   PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI,
-                         bool RetSmallStructInRegABI)
+                         bool RetSmallStructInRegABI,
+                         bool ComplexInRegABI)
       : TargetCodeGenInfo(std::make_unique<PPC32_SVR4_ABIInfo>(
-            CGT, SoftFloatABI, RetSmallStructInRegABI)) {}
+            CGT, SoftFloatABI, RetSmallStructInRegABI,
+            ComplexInRegABI)) {}
 
   static bool isStructReturnInRegABI(const llvm::Triple &Triple,
                                      const CodeGenOptions &Opts);
@@ -337,6 +344,32 @@
   return CharUnits::fromQuantity(4);
 }
 
+ABIArgInfo PPC32_SVR4_ABIInfo::handleComplex(QualType Ty) const{
+
+    uint64_t TyAlign = getContext().getTypeUnadjustedAlignInChars(Ty).getQuantity();
+    llvm::Type* ElemTy;
+    unsigned SizeRegs;
+
+    if (TyAlign <= 4) {
+      ElemTy = llvm::Type::getInt32Ty(getVMContext());
+      SizeRegs = (getContext().getTypeSize(Ty) + 31) / 32;
+    } else {
+      ElemTy = llvm::Type::getInt64Ty(getVMContext());
+      SizeRegs = (getContext().getTypeSize(Ty) + 63) / 64;
+    }
+    return ABIArgInfo::getDirect(llvm::ArrayType::get(ElemTy, SizeRegs));
+}
+
+ABIArgInfo PPC32_SVR4_ABIInfo::classifyArgumentType(QualType Ty) const{
+
+  Ty = useFirstFieldIfTransparentUnion(Ty);
+
+  if (isComplexInRegABI && Ty->isAnyComplexType()) {
+    return handleComplex(Ty);
+  }
+  return DefaultABIInfo::classifyArgumentType(Ty);
+}
+
 ABIArgInfo PPC32_SVR4_ABIInfo::classifyReturnType(QualType RetTy) const {
   uint64_t Size;
 
@@ -362,6 +395,10 @@
     }
   }
 
+  if(isComplexInRegABI && RetTy->isAnyComplexType()) {
+    return handleComplex(RetTy);
+  }
+
   return DefaultABIInfo::classifyReturnType(RetTy);
 }
 
@@ -956,8 +993,11 @@
 CodeGen::createPPC32TargetCodeGenInfo(CodeGenModule &CGM, bool SoftFloatABI) {
   bool RetSmallStructInRegABI = PPC32TargetCodeGenInfo::isStructReturnInRegABI(
       CGM.getTriple(), CGM.getCodeGenOpts());
+  bool isComplexInRegABI = CGM.getCodeGenOpts().getComplexInRegABI();
+
   return std::make_unique<PPC32TargetCodeGenInfo>(CGM.getTypes(), SoftFloatABI,
-                                                  RetSmallStructInRegABI);
+                                                  RetSmallStructInRegABI,
+                                                  isComplexInRegABI);
 }
 
 std::unique_ptr<TargetCodeGenInfo>
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -5415,6 +5415,15 @@
     }
   }
 
+  if(Arg *A = Args.getLastArg(options::OPT_fcomplex_ppc_gnu_abi)){
+    if(!TC.getTriple().isPPC32() || !TC.getTriple().isOSBinFormatELF()) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+        << A->getSpelling() << RawTriple.str();
+    } else {
+        CmdArgs.push_back("-fcomplex-ppc-gnu-abi");
+    }
+  }
+
   if (Args.hasFlag(options::OPT_mrtd, options::OPT_mno_rtd, false))
     CmdArgs.push_back("-fdefault-calling-conv=stdcall");
 
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -1929,6 +1929,10 @@
     }
   }
 
+  if(Args.getLastArg(OPT_fcomplex_ppc_gnu_abi)){
+    Opts.setComplexInRegABI(true);
+  }
+
   if (Arg *A = Args.getLastArg(OPT_mxcoff_roptr)) {
     if (!T.isOSAIX())
       Diags.Report(diag::err_drv_unsupported_opt_for_target)
Index: clang/test/CodeGen/PowerPC/ppc32-complex-gnu-abi.c
===================================================================
--- /dev/null
+++ clang/test/CodeGen/PowerPC/ppc32-complex-gnu-abi.c
@@ -0,0 +1,133 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 2
+
+// RUN: %clang_cc1 -triple powerpcle-unknown-linux-gnu -target-cpu pwr8 \
+// RUN:   -emit-llvm %s -o - | FileCheck %s --check-prefix=CHECK-DEF
+// RUN: %clang_cc1 -triple powerpcle-unknown-linux-gnu -target-cpu pwr8 -fcomplex-ppc-gnu-abi \
+// RUN:   -emit-llvm %s -o -  | FileCheck %s --check-prefix=CHECK-GNU
+
+
+// CHECK-DEF-LABEL: define dso_local void @foo1
+// CHECK-DEF-SAME: (ptr noalias sret({ float, float }) align 4 [[AGG_RESULT:%.*]], ptr noundef byval({ float, float }) align 4 [[X:%.*]]) #[[ATTR0:[0-9]+]] {
+// CHECK-DEF-NEXT:  entry:
+// CHECK-DEF-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[X]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[X_REAL:%.*]] = load float, ptr [[X_REALP]], align 4
+// CHECK-DEF-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[X]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[X_IMAG:%.*]] = load float, ptr [[X_IMAGP]], align 4
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store float [[X_REAL]], ptr [[AGG_RESULT_REALP]], align 4
+// CHECK-DEF-NEXT:    store float [[X_IMAG]], ptr [[AGG_RESULT_IMAGP]], align 4
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP1:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REAL:%.*]] = load float, ptr [[AGG_RESULT_REALP1]], align 4
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP2:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAG:%.*]] = load float, ptr [[AGG_RESULT_IMAGP2]], align 4
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP3:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP4:%.*]] = getelementptr inbounds { float, float }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store float [[AGG_RESULT_REAL]], ptr [[AGG_RESULT_REALP3]], align 4
+// CHECK-DEF-NEXT:    store float [[AGG_RESULT_IMAG]], ptr [[AGG_RESULT_IMAGP4]], align 4
+// CHECK-DEF-NEXT:    ret void
+//
+// CHECK-GNU-LABEL: define dso_local [2 x i32] @foo1
+// CHECK-GNU-SAME: ([2 x i32] noundef [[X_COERCE:%.*]]) #[[ATTR0:[0-9]+]] {
+// CHECK-GNU-NEXT:  entry:
+// CHECK-GNU-NEXT:    [[RETVAL:%.*]] = alloca { float, float }, align 4
+// CHECK-GNU-NEXT:    [[X:%.*]] = alloca { float, float }, align 4
+// CHECK-GNU-NEXT:    store [2 x i32] [[X_COERCE]], ptr [[X]], align 4
+// CHECK-GNU-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[X]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[X_REAL:%.*]] = load float, ptr [[X_REALP]], align 4
+// CHECK-GNU-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[X]], i32 0, i32 1
+// CHECK-GNU-NEXT:    [[X_IMAG:%.*]] = load float, ptr [[X_IMAGP]], align 4
+// CHECK-GNU-NEXT:    [[RETVAL_REALP:%.*]] = getelementptr inbounds { float, float }, ptr [[RETVAL]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[RETVAL_IMAGP:%.*]] = getelementptr inbounds { float, float }, ptr [[RETVAL]], i32 0, i32 1
+// CHECK-GNU-NEXT:    store float [[X_REAL]], ptr [[RETVAL_REALP]], align 4
+// CHECK-GNU-NEXT:    store float [[X_IMAG]], ptr [[RETVAL_IMAGP]], align 4
+// CHECK-GNU-NEXT:    [[TMP0:%.*]] = load [2 x i32], ptr [[RETVAL]], align 4
+// CHECK-GNU-NEXT:    ret [2 x i32] [[TMP0]]
+//
+_Complex float foo1(_Complex float x) {
+  return x;
+}
+
+// CHECK-DEF-LABEL: define dso_local void @foo2
+// CHECK-DEF-SAME: (ptr noalias sret({ double, double }) align 8 [[AGG_RESULT:%.*]], ptr noundef byval({ double, double }) align 8 [[X:%.*]]) #[[ATTR0]] {
+// CHECK-DEF-NEXT:  entry:
+// CHECK-DEF-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { double, double }, ptr [[X]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[X_REAL:%.*]] = load double, ptr [[X_REALP]], align 8
+// CHECK-DEF-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { double, double }, ptr [[X]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[X_IMAG:%.*]] = load double, ptr [[X_IMAGP]], align 8
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store double [[X_REAL]], ptr [[AGG_RESULT_REALP]], align 8
+// CHECK-DEF-NEXT:    store double [[X_IMAG]], ptr [[AGG_RESULT_IMAGP]], align 8
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP1:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REAL:%.*]] = load double, ptr [[AGG_RESULT_REALP1]], align 8
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP2:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAG:%.*]] = load double, ptr [[AGG_RESULT_IMAGP2]], align 8
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP3:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP4:%.*]] = getelementptr inbounds { double, double }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store double [[AGG_RESULT_REAL]], ptr [[AGG_RESULT_REALP3]], align 8
+// CHECK-DEF-NEXT:    store double [[AGG_RESULT_IMAG]], ptr [[AGG_RESULT_IMAGP4]], align 8
+// CHECK-DEF-NEXT:    ret void
+//
+// CHECK-GNU-LABEL: define dso_local [2 x i64] @foo2
+// CHECK-GNU-SAME: ([2 x i64] noundef [[X_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK-GNU-NEXT:  entry:
+// CHECK-GNU-NEXT:    [[RETVAL:%.*]] = alloca { double, double }, align 8
+// CHECK-GNU-NEXT:    [[X:%.*]] = alloca { double, double }, align 8
+// CHECK-GNU-NEXT:    store [2 x i64] [[X_COERCE]], ptr [[X]], align 8
+// CHECK-GNU-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { double, double }, ptr [[X]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[X_REAL:%.*]] = load double, ptr [[X_REALP]], align 8
+// CHECK-GNU-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { double, double }, ptr [[X]], i32 0, i32 1
+// CHECK-GNU-NEXT:    [[X_IMAG:%.*]] = load double, ptr [[X_IMAGP]], align 8
+// CHECK-GNU-NEXT:    [[RETVAL_REALP:%.*]] = getelementptr inbounds { double, double }, ptr [[RETVAL]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[RETVAL_IMAGP:%.*]] = getelementptr inbounds { double, double }, ptr [[RETVAL]], i32 0, i32 1
+// CHECK-GNU-NEXT:    store double [[X_REAL]], ptr [[RETVAL_REALP]], align 8
+// CHECK-GNU-NEXT:    store double [[X_IMAG]], ptr [[RETVAL_IMAGP]], align 8
+// CHECK-GNU-NEXT:    [[TMP0:%.*]] = load [2 x i64], ptr [[RETVAL]], align 8
+// CHECK-GNU-NEXT:    ret [2 x i64] [[TMP0]]
+//
+_Complex double foo2(_Complex double x) {
+  return x;
+}
+
+// CHECK-DEF-LABEL: define dso_local void @foo3
+// CHECK-DEF-SAME: (ptr noalias sret({ ppc_fp128, ppc_fp128 }) align 16 [[AGG_RESULT:%.*]], ptr noundef byval({ ppc_fp128, ppc_fp128 }) align 16 [[X:%.*]]) #[[ATTR0]] {
+// CHECK-DEF-NEXT:  entry:
+// CHECK-DEF-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[X]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[X_REAL:%.*]] = load ppc_fp128, ptr [[X_REALP]], align 16
+// CHECK-DEF-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[X]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[X_IMAG:%.*]] = load ppc_fp128, ptr [[X_IMAGP]], align 16
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store ppc_fp128 [[X_REAL]], ptr [[AGG_RESULT_REALP]], align 16
+// CHECK-DEF-NEXT:    store ppc_fp128 [[X_IMAG]], ptr [[AGG_RESULT_IMAGP]], align 16
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP1:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REAL:%.*]] = load ppc_fp128, ptr [[AGG_RESULT_REALP1]], align 16
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP2:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAG:%.*]] = load ppc_fp128, ptr [[AGG_RESULT_IMAGP2]], align 16
+// CHECK-DEF-NEXT:    [[AGG_RESULT_REALP3:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 0
+// CHECK-DEF-NEXT:    [[AGG_RESULT_IMAGP4:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[AGG_RESULT]], i32 0, i32 1
+// CHECK-DEF-NEXT:    store ppc_fp128 [[AGG_RESULT_REAL]], ptr [[AGG_RESULT_REALP3]], align 16
+// CHECK-DEF-NEXT:    store ppc_fp128 [[AGG_RESULT_IMAG]], ptr [[AGG_RESULT_IMAGP4]], align 16
+// CHECK-DEF-NEXT:    ret void
+//
+// CHECK-GNU-LABEL: define dso_local [4 x i64] @foo3
+// CHECK-GNU-SAME: ([4 x i64] noundef [[X_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK-GNU-NEXT:  entry:
+// CHECK-GNU-NEXT:    [[RETVAL:%.*]] = alloca { ppc_fp128, ppc_fp128 }, align 16
+// CHECK-GNU-NEXT:    [[X:%.*]] = alloca { ppc_fp128, ppc_fp128 }, align 16
+// CHECK-GNU-NEXT:    store [4 x i64] [[X_COERCE]], ptr [[X]], align 16
+// CHECK-GNU-NEXT:    [[X_REALP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[X]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[X_REAL:%.*]] = load ppc_fp128, ptr [[X_REALP]], align 16
+// CHECK-GNU-NEXT:    [[X_IMAGP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[X]], i32 0, i32 1
+// CHECK-GNU-NEXT:    [[X_IMAG:%.*]] = load ppc_fp128, ptr [[X_IMAGP]], align 16
+// CHECK-GNU-NEXT:    [[RETVAL_REALP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[RETVAL]], i32 0, i32 0
+// CHECK-GNU-NEXT:    [[RETVAL_IMAGP:%.*]] = getelementptr inbounds { ppc_fp128, ppc_fp128 }, ptr [[RETVAL]], i32 0, i32 1
+// CHECK-GNU-NEXT:    store ppc_fp128 [[X_REAL]], ptr [[RETVAL_REALP]], align 16
+// CHECK-GNU-NEXT:    store ppc_fp128 [[X_IMAG]], ptr [[RETVAL_IMAGP]], align 16
+// CHECK-GNU-NEXT:    [[TMP0:%.*]] = load [4 x i64], ptr [[RETVAL]], align 16
+// CHECK-GNU-NEXT:    ret [4 x i64] [[TMP0]]
+//
+_Complex long double foo3(_Complex long double x) {
+  return x;
+}