https://github.com/mmha created https://github.com/llvm/llvm-project/pull/151066
This fairly simple addition enables codegen for C++ conversion operators
>From 433b6af403ce2648717874d1cce0cb9ea8142804 Mon Sep 17 00:00:00 2001
From: Morris Hafner <mhaf...@nvidia.com>
Date: Tue, 29 Jul 2025 02:51:46 +0200
Subject: [PATCH] [CIR] Add support for C++ conversion operators
This fairly simple addition enables codegen for C++ conversion operators
---
clang/lib/CIR/CodeGen/CIRGenModule.cpp | 1 +
.../CIR/CodeGen/cxx-conversion-operators.cpp | 130 ++++++++++++++++++
2 files changed, 131 insertions(+)
create mode 100644 clang/test/CIR/CodeGen/cxx-conversion-operators.cpp
diff --git a/clang/lib/CIR/CodeGen/CIRGenModule.cpp
b/clang/lib/CIR/CodeGen/CIRGenModule.cpp
index 350270518156e..b1db5eeb70dc9 100644
--- a/clang/lib/CIR/CodeGen/CIRGenModule.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenModule.cpp
@@ -1235,6 +1235,7 @@ void CIRGenModule::emitTopLevelDecl(Decl *decl) {
decl->getDeclKindName());
break;
+ case Decl::CXXConversion:
case Decl::CXXMethod:
case Decl::Function: {
auto *fd = cast<FunctionDecl>(decl);
diff --git a/clang/test/CIR/CodeGen/cxx-conversion-operators.cpp
b/clang/test/CIR/CodeGen/cxx-conversion-operators.cpp
new file mode 100644
index 0000000000000..f56cb3d8e0205
--- /dev/null
+++ b/clang/test/CIR/CodeGen/cxx-conversion-operators.cpp
@@ -0,0 +1,130 @@
+// RUN: %clang_cc1 -std=c++11 -triple aarch64-none-linux-android21 -fclangir
-emit-cir %s -o %t.cir
+// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
+// RUN: %clang_cc1 -std=c++11 -triple aarch64-none-linux-android21 -fclangir
-emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --check-prefix=LLVM --input-file=%t-cir.ll %s
+// RUN: %clang_cc1 -std=c++11 -triple aarch64-none-linux-android21 -emit-llvm
%s -o %t.ll
+// RUN: FileCheck --check-prefix=OGCG --input-file=%t.ll %s
+
+struct inline_operator {
+ operator int() const {
+ return 987;
+ }
+
+ int operator+(inline_operator) {
+ return 666;
+ }
+};
+
+struct out_of_line_operator {
+ operator int();
+};
+
+out_of_line_operator::operator int() {
+ return 123;
+}
+
+void test() {
+ int x = 42;
+
+ inline_operator i;
+ x = i;
+
+ out_of_line_operator o;
+ x = o;
+}
+
+// CIR: cir.func dso_local @_ZN20out_of_line_operatorcviEv(%[[THIS_ARG:.+]]:
!cir.ptr<!rec_out_of_line_operator>{{.*}}) -> !s32i
+// CIR: %[[THIS_ALLOCA:.+]] = cir.alloca
!cir.ptr<!rec_out_of_line_operator>,
!cir.ptr<!cir.ptr<!rec_out_of_line_operator>>, ["this", init]
+// CIR: %[[RETVAL:.+]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["__retval"]
+// CIR: cir.store %[[THIS_ARG]], %[[THIS_ALLOCA]] :
!cir.ptr<!rec_out_of_line_operator>,
!cir.ptr<!cir.ptr<!rec_out_of_line_operator>>
+// CIR: %[[THIS_LOAD:.+]] = cir.load %[[THIS_ALLOCA]] :
!cir.ptr<!cir.ptr<!rec_out_of_line_operator>>,
!cir.ptr<!rec_out_of_line_operator>
+// CIR: %[[CONST_123:.+]] = cir.const #cir.int<123> : !s32i
+// CIR: cir.store %[[CONST_123]], %[[RETVAL]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[RET_LOAD:.+]] = cir.load %[[RETVAL]] : !cir.ptr<!s32i>, !s32i
+// CIR: cir.return %[[RET_LOAD]] : !s32i
+// CIR: }
+
+// CIR: cir.func comdat linkonce_odr
@_ZNK15inline_operatorcviEv(%[[INLINE_THIS_ARG:.+]]:
!cir.ptr<!rec_inline_operator>{{.*}}) -> !s32i
+// CIR: %[[INLINE_THIS_ALLOCA:.+]] = cir.alloca
!cir.ptr<!rec_inline_operator>, !cir.ptr<!cir.ptr<!rec_inline_operator>>,
["this", init]
+// CIR: %[[INLINE_RETVAL:.+]] = cir.alloca !s32i, !cir.ptr<!s32i>,
["__retval"]
+// CIR: cir.store %[[INLINE_THIS_ARG]], %[[INLINE_THIS_ALLOCA]] :
!cir.ptr<!rec_inline_operator>, !cir.ptr<!cir.ptr<!rec_inline_operator>>
+// CIR: %[[INLINE_THIS_LOAD:.+]] = cir.load %[[INLINE_THIS_ALLOCA]] :
!cir.ptr<!cir.ptr<!rec_inline_operator>>, !cir.ptr<!rec_inline_operator>
+// CIR: %[[CONST_987:.+]] = cir.const #cir.int<987> : !s32i
+// CIR: cir.store %[[CONST_987]], %[[INLINE_RETVAL]] : !s32i, !cir.ptr<!s32i>
+// CIR: %[[INLINE_RET_LOAD:.+]] = cir.load %[[INLINE_RETVAL]] :
!cir.ptr<!s32i>, !s32i
+// CIR: cir.return %[[INLINE_RET_LOAD]] : !s32i
+// CIR: }
+
+// CIR: cir.func dso_local @_Z4testv()
+// CIR: %[[X_ALLOCA:.+]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["x", init]
+// CIR: %[[I_ALLOCA:.+]] = cir.alloca {{.*}}, {{.*}}, ["i"]
+// CIR: %[[O_ALLOCA:.+]] = cir.alloca {{.*}}, {{.*}}, ["o"]
+// CIR: %[[CONST_42:.+]] = cir.const #cir.int<42> : !s32i
+// CIR: cir.store align(4) %[[CONST_42]], %[[X_ALLOCA]] : !s32i,
!cir.ptr<!s32i>
+// CIR: %[[INLINE_CALL:.+]] = cir.call
@_ZNK15inline_operatorcviEv(%[[I_ALLOCA]]) : ({{.*}}) -> !s32i
+// CIR: cir.store align(4) %[[INLINE_CALL]], %[[X_ALLOCA]] : !s32i,
!cir.ptr<!s32i>
+// CIR: %[[OUTLINE_CALL:.+]] = cir.call
@_ZN20out_of_line_operatorcviEv(%[[O_ALLOCA]]) : ({{.*}}) -> !s32i
+// CIR: cir.store align(4) %[[OUTLINE_CALL]], %[[X_ALLOCA]] : !s32i,
!cir.ptr<!s32i>
+// CIR: cir.return
+// CIR: }
+
+// LLVM: define dso_local i32 @_ZN20out_of_line_operatorcviEv(ptr
%[[PARAM0:.+]])
+// LLVM: %[[THIS_ALLOCA:.+]] = alloca ptr, i64 1
+// LLVM: %[[RETVAL:.+]] = alloca i32, i64 1
+// LLVM: store ptr %[[PARAM0]], ptr %[[THIS_ALLOCA]]
+// LLVM: %[[THIS_LOAD:.+]] = load ptr, ptr %[[THIS_ALLOCA]]
+// LLVM: store i32 123, ptr %[[RETVAL]]
+// LLVM: %[[RET_LOAD:.+]] = load i32, ptr %[[RETVAL]]
+// LLVM: ret i32 %[[RET_LOAD]]
+// LLVM: }
+
+// LLVM: define linkonce_odr i32 @_ZNK15inline_operatorcviEv(ptr
%[[INLINE_PARAM0:.+]])
+// LLVM: %[[INLINE_THIS_ALLOCA:.+]] = alloca ptr, i64 1
+// LLVM: %[[INLINE_RETVAL:.+]] = alloca i32, i64 1
+// LLVM: store ptr %[[INLINE_PARAM0]], ptr %[[INLINE_THIS_ALLOCA]]
+// LLVM: %[[INLINE_THIS_LOAD:.+]] = load ptr, ptr %[[INLINE_THIS_ALLOCA]]
+// LLVM: store i32 987, ptr %[[INLINE_RETVAL]]
+// LLVM: %[[INLINE_RET_LOAD:.+]] = load i32, ptr %[[INLINE_RETVAL]]
+// LLVM: ret i32 %[[INLINE_RET_LOAD]]
+// LLVM: }
+
+// LLVM: define dso_local void @_Z4testv()
+// LLVM: %[[X_ALLOCA:.+]] = alloca i32, i64 1
+// LLVM: %[[I_ALLOCA:.+]] = alloca {{.*}}, i64 1
+// LLVM: %[[O_ALLOCA:.+]] = alloca {{.*}}, i64 1
+// LLVM: store i32 42, ptr %[[X_ALLOCA]]
+// LLVM: %[[INLINE_CALL:.+]] = call i32 @_ZNK15inline_operatorcviEv(ptr
%[[I_ALLOCA]])
+// LLVM: store i32 %[[INLINE_CALL]], ptr %[[X_ALLOCA]]
+// LLVM: %[[OUTLINE_CALL:.+]] = call i32 @_ZN20out_of_line_operatorcviEv(ptr
%[[O_ALLOCA]])
+// LLVM: store i32 %[[OUTLINE_CALL]], ptr %[[X_ALLOCA]]
+// LLVM: ret void
+// LLVM: }
+
+// OGCG: define dso_local noundef i32 @_ZN20out_of_line_operatorcviEv(ptr
{{.*}} %[[THIS_PARAM:.+]])
+// OGCG: entry:
+// OGCG: %[[THIS_ADDR:.+]] = alloca ptr
+// OGCG: store ptr %[[THIS_PARAM]], ptr %[[THIS_ADDR]]
+// OGCG: %[[THIS_LOAD:.+]] = load ptr, ptr %[[THIS_ADDR]]
+// OGCG: ret i32 123
+// OGCG: }
+
+// OGCG: define dso_local void @_Z4testv()
+// OGCG: entry:
+// OGCG: %[[X_VAR:.+]] = alloca i32
+// OGCG: %[[I_VAR:.+]] = alloca {{.*}}
+// OGCG: %[[O_VAR:.+]] = alloca {{.*}}
+// OGCG: store i32 42, ptr %[[X_VAR]]
+// OGCG: %[[INLINE_CALL:.+]] = call noundef i32
@_ZNK15inline_operatorcviEv(ptr {{.*}} %[[I_VAR]])
+// OGCG: store i32 %[[INLINE_CALL]], ptr %[[X_VAR]]
+// OGCG: %[[OUTLINE_CALL:.+]] = call noundef i32
@_ZN20out_of_line_operatorcviEv(ptr {{.*}} %[[O_VAR]])
+// OGCG: store i32 %[[OUTLINE_CALL]], ptr %[[X_VAR]]
+// OGCG: ret void
+// OGCG: }
+
+// OGCG: define linkonce_odr noundef i32 @_ZNK15inline_operatorcviEv(ptr
{{.*}} %[[INLINE_THIS_PARAM:.+]])
+// OGCG: entry:
+// OGCG: %[[INLINE_THIS_ADDR:.+]] = alloca ptr
+// OGCG: store ptr %[[INLINE_THIS_PARAM]], ptr %[[INLINE_THIS_ADDR]]
+// OGCG: %[[INLINE_THIS_LOAD:.+]] = load ptr, ptr %[[INLINE_THIS_ADDR]]
+// OGCG: ret i32 987
+// OGCG: }
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