[clang] [llvm] [clang] Support the Swift calling convention on 32-bit PowerPC (PR #205457)

[Alsey Coleman Miller via cfe-commits]

https://github.com/colemancda updated https://github.com/llvm/llvm-project/pull/205457

>From 5bc2dbe86f599464ad81ee0a72273bd1412d2895 Mon Sep 17 00:00:00 2001
From: Alsey Coleman Miller <alseycmiller at gmail.com>
Date: Fri, 26 Jun 2026 09:14:41 -0400
Subject: [PATCH] [clang] Add Swift support for 32-bit PowerPC

---
 clang/lib/CodeGen/Targets/PPC.cpp           | 5 ++++-
 llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 7 ++++---
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/clang/lib/CodeGen/Targets/PPC.cpp b/clang/lib/CodeGen/Targets/PPC.cpp
index ab069bfbd1b51..d2e8d607806b5 100644
--- a/clang/lib/CodeGen/Targets/PPC.cpp
+++ b/clang/lib/CodeGen/Targets/PPC.cpp
@@ -387,7 +387,10 @@ class PPC32TargetCodeGenInfo : public TargetCodeGenInfo {
   PPC32TargetCodeGenInfo(CodeGenTypes &CGT, bool SoftFloatABI,
                          bool RetSmallStructInRegABI)
       : TargetCodeGenInfo(std::make_unique<PPC32_SVR4_ABIInfo>(
-            CGT, SoftFloatABI, RetSmallStructInRegABI)) {}
+            CGT, SoftFloatABI, RetSmallStructInRegABI)) {
+    SwiftInfo =
+        std::make_unique<SwiftABIInfo>(CGT, /*SwiftErrorInRegister=*/false);
+  }
 
   static bool isStructReturnInRegABI(const llvm::Triple &Triple,
                                      const CodeGenOptions &Opts);
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 76cc06f2b4ed9..1c30846a3182c 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -5978,9 +5978,10 @@ SDValue PPCTargetLowering::LowerCall_32SVR4(
   const bool IsVarArg = CFlags.IsVarArg;
   const bool IsTailCall = CFlags.IsTailCall;
 
-  assert((CallConv == CallingConv::C ||
-          CallConv == CallingConv::Cold ||
-          CallConv == CallingConv::Fast) && "Unknown calling convention!");
+  assert((CallConv == CallingConv::C || CallConv == CallingConv::Cold ||
+          CallConv == CallingConv::Fast || CallConv == CallingConv::Swift ||
+          CallConv == CallingConv::SwiftTail) &&
+         "Unknown calling convention!");
 
   const Align PtrAlign(4);