https://github.com/svs-quic updated
https://github.com/llvm/llvm-project/pull/97315
>From 3c744fe6111f0b6d24356a584f94c6d1cb273f7a Mon Sep 17 00:00:00 2001
From: Sudharsan Veeravalli <quic_...@quicinc.com>
Date: Mon, 1 Jul 2024 21:58:37 +0530
Subject: [PATCH 1/3] [RISCV] Handle empty structs/unions passing in C++
---
clang/lib/CodeGen/Targets/RISCV.cpp | 9 +++---
clang/test/CodeGen/RISCV/abi-empty-structs.c | 34 ++++++++++++++++++++
2 files changed, 39 insertions(+), 4 deletions(-)
diff --git a/clang/lib/CodeGen/Targets/RISCV.cpp
b/clang/lib/CodeGen/Targets/RISCV.cpp
index a4c5ec315b8df..f2add9351c03c 100644
--- a/clang/lib/CodeGen/Targets/RISCV.cpp
+++ b/clang/lib/CodeGen/Targets/RISCV.cpp
@@ -361,12 +361,13 @@ ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType
Ty, bool IsFixed,
CGCXXABI::RAA_DirectInMemory);
}
- // Ignore empty structs/unions.
- if (isEmptyRecord(getContext(), Ty, true))
- return ABIArgInfo::getIgnore();
-
uint64_t Size = getContext().getTypeSize(Ty);
+ // Ignore empty structs/unions whose size is zero. According to the calling
+ // convention empty structs/unions are required to be sized types in C++.
+ if (isEmptyRecord(getContext(), Ty, true) && Size == 0)
+ return ABIArgInfo::getIgnore();
+
// Pass floating point values via FPRs if possible.
if (IsFixed && Ty->isFloatingType() && !Ty->isComplexType() &&
FLen >= Size && ArgFPRsLeft) {
diff --git a/clang/test/CodeGen/RISCV/abi-empty-structs.c
b/clang/test/CodeGen/RISCV/abi-empty-structs.c
index c48a2891627d4..877ed4962d4e8 100644
--- a/clang/test/CodeGen/RISCV/abi-empty-structs.c
+++ b/clang/test/CodeGen/RISCV/abi-empty-structs.c
@@ -167,6 +167,40 @@ struct s9 {
//
void test_s9(struct s9 a) {}
+struct s10 { };
+// CHECK-C-LABEL: define dso_local void @test_s10
+// CHECK-C-SAME: () #[[ATTR0]] {
+// CHECK-C: entry:
+//
+// CHECK32-CXX-LABEL: define dso_local i32 @_Z8test_s103s10
+// CHECK32-CXX-SAME: (i32 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK32-CXX: entry:
+//
+// CHECK64-CXX-LABEL: define dso_local i64 @_Z8test_s103s10
+// CHECK64-CXX-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK64-CXX: entry:
+//
+struct s10 test_s10(struct s10 a) {
+ return a;
+}
+
+struct s11 { int : 0; };
+// CHECK-C-LABEL: define dso_local void @test_s11
+// CHECK-C-SAME: () #[[ATTR0]] {
+// CHECK-C: entry:
+//
+// CHECK32-CXX-LABEL: define dso_local i32 @_Z8test_s113s11
+// CHECK32-CXX-SAME: (i32 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK32-CXX: entry:
+//
+// CHECK64-CXX-LABEL: define dso_local i64 @_Z8test_s113s11
+// CHECK64-CXX-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK64-CXX: entry:
+//
+struct s11 test_s11(struct s11 a) {
+ return a;
+}
+
//// NOTE: These prefixes are unused and the list is autogenerated. Do not add
tests below this line:
// CHECK32-C: {{.*}}
// CHECK64-C: {{.*}}
>From 004881e8b3453532bd5253e36a7c75b125784eda Mon Sep 17 00:00:00 2001
From: Sudharsan Veeravalli <quic_...@quicinc.com>
Date: Thu, 4 Jul 2024 08:57:37 +0530
Subject: [PATCH 2/3] Add test case
---
clang/test/CodeGen/RISCV/abi-empty-structs.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/clang/test/CodeGen/RISCV/abi-empty-structs.c
b/clang/test/CodeGen/RISCV/abi-empty-structs.c
index 877ed4962d4e8..fd119fbda046d 100644
--- a/clang/test/CodeGen/RISCV/abi-empty-structs.c
+++ b/clang/test/CodeGen/RISCV/abi-empty-structs.c
@@ -201,6 +201,19 @@ struct s11 test_s11(struct s11 a) {
return a;
}
+struct s12 {int x[0];};
+// CHECK-C-LABEL: define dso_local void @test_s12
+// CHECK-C-SAME: () #[[ATTR0]] {
+// CHECK-C: entry:
+//
+// CHECK-CXX-LABEL: define dso_local void @_Z8test_s123s12
+// CHECK-CXX-SAME: () #[[ATTR0]] {
+// CHECK-CXX: entry:
+//
+struct s12 test_s12(struct s12 a) {
+ return a;
+}
+
//// NOTE: These prefixes are unused and the list is autogenerated. Do not add
tests below this line:
// CHECK32-C: {{.*}}
// CHECK64-C: {{.*}}
>From d6b523c859218ca1c982b289de269bc828087701 Mon Sep 17 00:00:00 2001
From: Sudharsan Veeravalli <quic_...@quicinc.com>
Date: Sat, 6 Jul 2024 09:54:49 +0530
Subject: [PATCH 3/3] Change check and add release notes
---
clang/docs/ReleaseNotes.rst | 1 +
clang/lib/CodeGen/Targets/RISCV.cpp | 3 ++-
clang/test/CodeGen/RISCV/abi-empty-structs.c | 10 +++++++---
3 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 90c2469c1c89a..53ff40b1afef7 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1061,6 +1061,7 @@ RISC-V Support
- ``__attribute__((rvv_vector_bits(N)))`` is now supported for RVV vbool*_t
types.
- Profile names in ``-march`` option are now supported.
+- Passing empty structs/unions as arguments in C++ is now handled correctly.
The behavior is similar to GCC's.
CUDA/HIP Language Changes
^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/CodeGen/Targets/RISCV.cpp
b/clang/lib/CodeGen/Targets/RISCV.cpp
index f2add9351c03c..d1b84fd1724d7 100644
--- a/clang/lib/CodeGen/Targets/RISCV.cpp
+++ b/clang/lib/CodeGen/Targets/RISCV.cpp
@@ -365,7 +365,8 @@ ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty,
bool IsFixed,
// Ignore empty structs/unions whose size is zero. According to the calling
// convention empty structs/unions are required to be sized types in C++.
- if (isEmptyRecord(getContext(), Ty, true) && Size == 0)
+ if (isEmptyRecord(getContext(), Ty, true) &&
+ !getContext().getLangOpts().CPlusPlus)
return ABIArgInfo::getIgnore();
// Pass floating point values via FPRs if possible.
diff --git a/clang/test/CodeGen/RISCV/abi-empty-structs.c
b/clang/test/CodeGen/RISCV/abi-empty-structs.c
index fd119fbda046d..5a54838060368 100644
--- a/clang/test/CodeGen/RISCV/abi-empty-structs.c
+++ b/clang/test/CodeGen/RISCV/abi-empty-structs.c
@@ -206,9 +206,13 @@ struct s12 {int x[0];};
// CHECK-C-SAME: () #[[ATTR0]] {
// CHECK-C: entry:
//
-// CHECK-CXX-LABEL: define dso_local void @_Z8test_s123s12
-// CHECK-CXX-SAME: () #[[ATTR0]] {
-// CHECK-CXX: entry:
+// CHECK32-CXX-LABEL: define dso_local i32 @_Z8test_s123s12
+// CHECK32-CXX-SAME: (i32 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK32-CXX: entry:
+//
+// CHECK64-CXX-LABEL: define dso_local i64 @_Z8test_s123s12
+// CHECK64-CXX-SAME: (i64 [[A_COERCE:%.*]]) #[[ATTR0]] {
+// CHECK64-CXX: entry:
//
struct s12 test_s12(struct s12 a) {
return a;
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