[Clang][LoongArch] Add support for UEFI target #155598
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@llvm/pr-subscribers-clang-driver Author: None (leecheechen) ChangesThis patch adds basic UEFI target support for loongarch64. It enable Clang to recognize and handle Full diff: https://github.com/llvm/llvm-project/pull/155598.diff 7 Files Affected:
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index e3f9760ac7ce3..ea854e42e4396 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -760,6 +760,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
case llvm::Triple::OpenBSD:
return std::make_unique<OpenBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
Opts);
+ case llvm::Triple::UEFI:
+ return std::make_unique<UEFITargetInfo<LoongArch64TargetInfo>>(Triple,
+ Opts);
default:
return std::make_unique<LoongArch64TargetInfo>(Triple, Opts);
}
diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
index 88dc433924d6c..ae0838a58dd63 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -13,6 +13,7 @@
#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
#define LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
+#include "OSTargets.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "llvm/Support/Compiler.h"
@@ -159,6 +160,8 @@ class LLVM_LIBRARY_VISIBILITY LoongArch64TargetInfo
IntMaxType = Int64Type = SignedLong;
HasUnalignedAccess = true;
resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
+ if (Triple.isUEFI())
+ resetDataLayout("e-m:w-p:64:64-i64:64-i128:128-n32:64-S128");
// TODO: select appropriate ABI.
setABI("lp64d");
}
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index d682ffc832c83..9faeb33ba10b6 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -698,8 +698,10 @@ static llvm::Triple computeTargetTriple(const Driver &D,
}
}
- // Currently the only architecture supported by *-uefi triples are x86_64.
- if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64)
+ // Currently the only architectures supported by *-uefi triples are
+ // x86_64 and loongarch64.
+ if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64 &&
+ Target.getArch() != llvm::Triple::loongarch64)
D.Diag(diag::err_target_unknown_triple) << Target.str();
// The `-maix[32|64]` flags are only valid for AIX targets.
diff --git a/clang/test/CodeGen/LoongArch/uefi-data-layout.c b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
new file mode 100644
index 0000000000000..8c3e0b00d9d05
--- /dev/null
+++ b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
@@ -0,0 +1,3 @@
+// RUN: %clang -target loongarch64-unknown-uefi -S -emit-llvm -o - %s | \
+// RUN: FileCheck --check-prefix=LA64_UEFI %s
+// LA64_UEFI: target datalayout = "e-m:w-p:64:64-i64:64-i128:128-n32:64-S128"
diff --git a/clang/test/Driver/uefi-constructed-args.c b/clang/test/Driver/uefi-constructed-args.c
index 49ede47a8953e..c9f3cbaf105d3 100644
--- a/clang/test/Driver/uefi-constructed-args.c
+++ b/clang/test/Driver/uefi-constructed-args.c
@@ -12,3 +12,18 @@
// CHECK-SAME: "-entry:EfiMain"
// CHECK-SAME: "-tsaware:no"
// CHECK-SAME: "-debug"
+
+// RUN: %clang -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// RUN: %clang_cl -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// LA64: "-cc1"
+// LA64-SAME: "-triple" "loongarch64-unknown-uefi"
+// LA64-SAME: "-mrelocation-model" "pic" "-pic-level" "2"
+// LA64-SAME: "-mframe-pointer=all"
+// LA64-SAME: "-fms-extensions"
+// LA64-NEXT: "-nologo"
+// LA64-SAME: "-subsystem:efi_application"
+// LA64-SAME: "-entry:EfiMain"
+// LA64-SAME: "-tsaware:no"
+// LA64-SAME: "-debug"
diff --git a/clang/test/Driver/unsupported-target-arch.c b/clang/test/Driver/unsupported-target-arch.c
index 426f646db50b0..2f2fa4f8244df 100644
--- a/clang/test/Driver/unsupported-target-arch.c
+++ b/clang/test/Driver/unsupported-target-arch.c
@@ -77,3 +77,9 @@
// RUN: not %clang_cl --target=x86-unknown-uefi -o %t.o %s 2> %t.err
// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-x86 %s
// CHECK-x86: error: unknown target triple 'x86-unknown-uefi'{{$}}
+
+// RUN: not %clang --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// RUN: not %clang_cl --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// CHECK-la: error: unknown target triple 'loongarch-unknown-uefi'{{$}}
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 4fa27297cfd87..c61a7d69d2dbc 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -594,6 +594,19 @@ TEST(ToolChainTest, UEFICallingConventionTest) {
EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
TargetInfo::CallingConvKind::CCK_MicrosoftWin64);
+
+ TrStr = "loongarch64-unknown-uefi";
+ Tr.setOS(llvm::Triple::OSType::UEFI);
+ Tr.setVendor(llvm::Triple::VendorType::UnknownVendor);
+ Tr.setEnvironment(llvm::Triple::EnvironmentType::UnknownEnvironment);
+ Tr.setArch(llvm::Triple::ArchType::loongarch64);
+
+ compiler.getTargetOpts().Triple = Tr.getTriple();
+ compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+ compiler.getDiagnostics(), compiler.getTargetOpts()));
+
+ EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
+ TargetInfo::CallingConvKind::CCK_Default);
}
TEST(ToolChainTest, UEFIDefaultDebugFormatTest) {
|
|
@llvm/pr-subscribers-backend-loongarch Author: None (leecheechen) ChangesThis patch adds basic UEFI target support for loongarch64. It enable Clang to recognize and handle Full diff: https://github.com/llvm/llvm-project/pull/155598.diff 7 Files Affected:
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index e3f9760ac7ce3..ea854e42e4396 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -760,6 +760,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
case llvm::Triple::OpenBSD:
return std::make_unique<OpenBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
Opts);
+ case llvm::Triple::UEFI:
+ return std::make_unique<UEFITargetInfo<LoongArch64TargetInfo>>(Triple,
+ Opts);
default:
return std::make_unique<LoongArch64TargetInfo>(Triple, Opts);
}
diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
index 88dc433924d6c..ae0838a58dd63 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -13,6 +13,7 @@
#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
#define LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
+#include "OSTargets.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "llvm/Support/Compiler.h"
@@ -159,6 +160,8 @@ class LLVM_LIBRARY_VISIBILITY LoongArch64TargetInfo
IntMaxType = Int64Type = SignedLong;
HasUnalignedAccess = true;
resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
+ if (Triple.isUEFI())
+ resetDataLayout("e-m:w-p:64:64-i64:64-i128:128-n32:64-S128");
// TODO: select appropriate ABI.
setABI("lp64d");
}
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index d682ffc832c83..9faeb33ba10b6 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -698,8 +698,10 @@ static llvm::Triple computeTargetTriple(const Driver &D,
}
}
- // Currently the only architecture supported by *-uefi triples are x86_64.
- if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64)
+ // Currently the only architectures supported by *-uefi triples are
+ // x86_64 and loongarch64.
+ if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64 &&
+ Target.getArch() != llvm::Triple::loongarch64)
D.Diag(diag::err_target_unknown_triple) << Target.str();
// The `-maix[32|64]` flags are only valid for AIX targets.
diff --git a/clang/test/CodeGen/LoongArch/uefi-data-layout.c b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
new file mode 100644
index 0000000000000..8c3e0b00d9d05
--- /dev/null
+++ b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
@@ -0,0 +1,3 @@
+// RUN: %clang -target loongarch64-unknown-uefi -S -emit-llvm -o - %s | \
+// RUN: FileCheck --check-prefix=LA64_UEFI %s
+// LA64_UEFI: target datalayout = "e-m:w-p:64:64-i64:64-i128:128-n32:64-S128"
diff --git a/clang/test/Driver/uefi-constructed-args.c b/clang/test/Driver/uefi-constructed-args.c
index 49ede47a8953e..c9f3cbaf105d3 100644
--- a/clang/test/Driver/uefi-constructed-args.c
+++ b/clang/test/Driver/uefi-constructed-args.c
@@ -12,3 +12,18 @@
// CHECK-SAME: "-entry:EfiMain"
// CHECK-SAME: "-tsaware:no"
// CHECK-SAME: "-debug"
+
+// RUN: %clang -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// RUN: %clang_cl -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// LA64: "-cc1"
+// LA64-SAME: "-triple" "loongarch64-unknown-uefi"
+// LA64-SAME: "-mrelocation-model" "pic" "-pic-level" "2"
+// LA64-SAME: "-mframe-pointer=all"
+// LA64-SAME: "-fms-extensions"
+// LA64-NEXT: "-nologo"
+// LA64-SAME: "-subsystem:efi_application"
+// LA64-SAME: "-entry:EfiMain"
+// LA64-SAME: "-tsaware:no"
+// LA64-SAME: "-debug"
diff --git a/clang/test/Driver/unsupported-target-arch.c b/clang/test/Driver/unsupported-target-arch.c
index 426f646db50b0..2f2fa4f8244df 100644
--- a/clang/test/Driver/unsupported-target-arch.c
+++ b/clang/test/Driver/unsupported-target-arch.c
@@ -77,3 +77,9 @@
// RUN: not %clang_cl --target=x86-unknown-uefi -o %t.o %s 2> %t.err
// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-x86 %s
// CHECK-x86: error: unknown target triple 'x86-unknown-uefi'{{$}}
+
+// RUN: not %clang --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// RUN: not %clang_cl --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// CHECK-la: error: unknown target triple 'loongarch-unknown-uefi'{{$}}
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 4fa27297cfd87..c61a7d69d2dbc 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -594,6 +594,19 @@ TEST(ToolChainTest, UEFICallingConventionTest) {
EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
TargetInfo::CallingConvKind::CCK_MicrosoftWin64);
+
+ TrStr = "loongarch64-unknown-uefi";
+ Tr.setOS(llvm::Triple::OSType::UEFI);
+ Tr.setVendor(llvm::Triple::VendorType::UnknownVendor);
+ Tr.setEnvironment(llvm::Triple::EnvironmentType::UnknownEnvironment);
+ Tr.setArch(llvm::Triple::ArchType::loongarch64);
+
+ compiler.getTargetOpts().Triple = Tr.getTriple();
+ compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+ compiler.getDiagnostics(), compiler.getTargetOpts()));
+
+ EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
+ TargetInfo::CallingConvKind::CCK_Default);
}
TEST(ToolChainTest, UEFIDefaultDebugFormatTest) {
|
|
@llvm/pr-subscribers-clang Author: None (leecheechen) ChangesThis patch adds basic UEFI target support for loongarch64. It enable Clang to recognize and handle Full diff: https://github.com/llvm/llvm-project/pull/155598.diff 7 Files Affected:
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index e3f9760ac7ce3..ea854e42e4396 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -760,6 +760,9 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
case llvm::Triple::OpenBSD:
return std::make_unique<OpenBSDTargetInfo<LoongArch64TargetInfo>>(Triple,
Opts);
+ case llvm::Triple::UEFI:
+ return std::make_unique<UEFITargetInfo<LoongArch64TargetInfo>>(Triple,
+ Opts);
default:
return std::make_unique<LoongArch64TargetInfo>(Triple, Opts);
}
diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
index 88dc433924d6c..ae0838a58dd63 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -13,6 +13,7 @@
#ifndef LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
#define LLVM_CLANG_LIB_BASIC_TARGETS_LOONGARCH_H
+#include "OSTargets.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/Basic/TargetOptions.h"
#include "llvm/Support/Compiler.h"
@@ -159,6 +160,8 @@ class LLVM_LIBRARY_VISIBILITY LoongArch64TargetInfo
IntMaxType = Int64Type = SignedLong;
HasUnalignedAccess = true;
resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
+ if (Triple.isUEFI())
+ resetDataLayout("e-m:w-p:64:64-i64:64-i128:128-n32:64-S128");
// TODO: select appropriate ABI.
setABI("lp64d");
}
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index d682ffc832c83..9faeb33ba10b6 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -698,8 +698,10 @@ static llvm::Triple computeTargetTriple(const Driver &D,
}
}
- // Currently the only architecture supported by *-uefi triples are x86_64.
- if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64)
+ // Currently the only architectures supported by *-uefi triples are
+ // x86_64 and loongarch64.
+ if (Target.isUEFI() && Target.getArch() != llvm::Triple::x86_64 &&
+ Target.getArch() != llvm::Triple::loongarch64)
D.Diag(diag::err_target_unknown_triple) << Target.str();
// The `-maix[32|64]` flags are only valid for AIX targets.
diff --git a/clang/test/CodeGen/LoongArch/uefi-data-layout.c b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
new file mode 100644
index 0000000000000..8c3e0b00d9d05
--- /dev/null
+++ b/clang/test/CodeGen/LoongArch/uefi-data-layout.c
@@ -0,0 +1,3 @@
+// RUN: %clang -target loongarch64-unknown-uefi -S -emit-llvm -o - %s | \
+// RUN: FileCheck --check-prefix=LA64_UEFI %s
+// LA64_UEFI: target datalayout = "e-m:w-p:64:64-i64:64-i128:128-n32:64-S128"
diff --git a/clang/test/Driver/uefi-constructed-args.c b/clang/test/Driver/uefi-constructed-args.c
index 49ede47a8953e..c9f3cbaf105d3 100644
--- a/clang/test/Driver/uefi-constructed-args.c
+++ b/clang/test/Driver/uefi-constructed-args.c
@@ -12,3 +12,18 @@
// CHECK-SAME: "-entry:EfiMain"
// CHECK-SAME: "-tsaware:no"
// CHECK-SAME: "-debug"
+
+// RUN: %clang -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// RUN: %clang_cl -### --target=loongarch64-unknown-uefi -g -- %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=LA64 %s
+// LA64: "-cc1"
+// LA64-SAME: "-triple" "loongarch64-unknown-uefi"
+// LA64-SAME: "-mrelocation-model" "pic" "-pic-level" "2"
+// LA64-SAME: "-mframe-pointer=all"
+// LA64-SAME: "-fms-extensions"
+// LA64-NEXT: "-nologo"
+// LA64-SAME: "-subsystem:efi_application"
+// LA64-SAME: "-entry:EfiMain"
+// LA64-SAME: "-tsaware:no"
+// LA64-SAME: "-debug"
diff --git a/clang/test/Driver/unsupported-target-arch.c b/clang/test/Driver/unsupported-target-arch.c
index 426f646db50b0..2f2fa4f8244df 100644
--- a/clang/test/Driver/unsupported-target-arch.c
+++ b/clang/test/Driver/unsupported-target-arch.c
@@ -77,3 +77,9 @@
// RUN: not %clang_cl --target=x86-unknown-uefi -o %t.o %s 2> %t.err
// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-x86 %s
// CHECK-x86: error: unknown target triple 'x86-unknown-uefi'{{$}}
+
+// RUN: not %clang --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// RUN: not %clang_cl --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err
+// RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s
+// CHECK-la: error: unknown target triple 'loongarch-unknown-uefi'{{$}}
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 4fa27297cfd87..c61a7d69d2dbc 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -594,6 +594,19 @@ TEST(ToolChainTest, UEFICallingConventionTest) {
EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
TargetInfo::CallingConvKind::CCK_MicrosoftWin64);
+
+ TrStr = "loongarch64-unknown-uefi";
+ Tr.setOS(llvm::Triple::OSType::UEFI);
+ Tr.setVendor(llvm::Triple::VendorType::UnknownVendor);
+ Tr.setEnvironment(llvm::Triple::EnvironmentType::UnknownEnvironment);
+ Tr.setArch(llvm::Triple::ArchType::loongarch64);
+
+ compiler.getTargetOpts().Triple = Tr.getTriple();
+ compiler.setTarget(clang::TargetInfo::CreateTargetInfo(
+ compiler.getDiagnostics(), compiler.getTargetOpts()));
+
+ EXPECT_EQ(compiler.getTarget().getCallingConvKind(true),
+ TargetInfo::CallingConvKind::CCK_Default);
}
TEST(ToolChainTest, UEFIDefaultDebugFormatTest) {
|
SixWeining
reviewed
Aug 28, 2025
Comment on lines
81
to
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| // RUN: not %clang --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err | ||
| // RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s | ||
| // RUN: not %clang_cl --target=loongarch-unknown-uefi -o %t.o %s 2> %t.err | ||
| // RUN: FileCheck --input-file=%t.err -check-prefixes=CHECK-la %s | ||
| // CHECK-la: error: unknown target triple 'loongarch-unknown-uefi'{{$}} |
There was a problem hiding this comment.
I think it's not need to add this invalid-arch test.
Comment on lines
597
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|
|
||
| TrStr = "loongarch64-unknown-uefi"; | ||
| Tr.setOS(llvm::Triple::OSType::UEFI); | ||
| Tr.setVendor(llvm::Triple::VendorType::UnknownVendor); | ||
| Tr.setEnvironment(llvm::Triple::EnvironmentType::UnknownEnvironment); | ||
| Tr.setArch(llvm::Triple::ArchType::loongarch64); | ||
|
|
||
| compiler.getTargetOpts().Triple = Tr.getTriple(); | ||
| compiler.setTarget(clang::TargetInfo::CreateTargetInfo( | ||
| compiler.getDiagnostics(), compiler.getTargetOpts())); | ||
|
|
||
| EXPECT_EQ(compiler.getTarget().getCallingConvKind(true), | ||
| TargetInfo::CallingConvKind::CCK_Default); |
There was a problem hiding this comment.
No need to add this test until you override the getCallingConvKind interface in Basic/Targets/X86.h.
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This patch adds basic UEFI target support for loongarch64, enabling Clang to recognize and handle the loongarch64-unknown-uefi target triple.
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This patch adds basic UEFI target support for loongarch64, enabling Clang to recognize and handle the loongarch64-unknown-uefi target triple.
Depends on #154883