https://github.com/Ami-zhang created
https://github.com/llvm/llvm-project/pull/140700
This adds support under LoongArch for the target("..") attributes.
The supported formats are:
- "arch=<arch>" strings, that specify the architecture features for a function
as per the -march=arch option.
- "tune=<cpu>" strings, that specify the tune-cpu cpu for a function as per
-mtune.
- "<feature>", "no-<feature>" enabled/disables the specific feature.
>From c5e14f95357d9d97255f50dab346232817df8e28 Mon Sep 17 00:00:00 2001
From: Ami-zhang <zhangli...@loongson.cn>
Date: Wed, 14 May 2025 15:21:54 +0800
Subject: [PATCH] [Clang][LoongArch] Support target attribute for function
This adds support under LoongArch for the target("..") attributes.
The supported formats are:
- "arch=<arch>" strings, that specify the architecture features for a
function as per the -march=arch option.
- "tune=<cpu>" strings, that specify the tune-cpu cpu for a function as
per -mtune.
- "<feature>", "no-<feature>" enabled/disables the specific feature.
---
clang/lib/Basic/Targets/LoongArch.cpp | 49 ++++++++++
clang/lib/Basic/Targets/LoongArch.h | 4 +
clang/lib/Sema/SemaDeclAttr.cpp | 11 +++
clang/test/CodeGen/LoongArch/targetattr.c | 92 +++++++++++++++++++
clang/test/Sema/attr-target-loongarch.c | 19 ++++
.../llvm/TargetParser/LoongArchTargetParser.h | 1 +
.../TargetParser/LoongArchTargetParser.cpp | 11 +++
7 files changed, 187 insertions(+)
create mode 100644 clang/test/CodeGen/LoongArch/targetattr.c
create mode 100644 clang/test/Sema/attr-target-loongarch.c
diff --git a/clang/lib/Basic/Targets/LoongArch.cpp
b/clang/lib/Basic/Targets/LoongArch.cpp
index ca742797d7a3b..aee273a76a608 100644
--- a/clang/lib/Basic/Targets/LoongArch.cpp
+++ b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -388,6 +388,51 @@ bool LoongArchTargetInfo::handleTargetFeatures(
return true;
}
+ParsedTargetAttr
+LoongArchTargetInfo::parseTargetAttr(StringRef Features) const {
+ ParsedTargetAttr Ret;
+ if (Features == "default")
+ return Ret;
+ SmallVector<StringRef, 1> AttrFeatures;
+ Features.split(AttrFeatures, ",");
+
+ for (auto &Feature : AttrFeatures) {
+ Feature = Feature.trim();
+
+ if (Feature.starts_with("arch=")) {
+ StringRef ArchValue = Feature.split("=").second.trim();
+
+ if (llvm::LoongArch::isValidArchName(ArchValue) ||
+ ArchValue == "la64v1.0" || ArchValue == "la64v1.1") {
+ std::vector<llvm::StringRef> ArchFeatures;
+ if (llvm::LoongArch::getArchFeatures(ArchValue, ArchFeatures)) {
+ Ret.Features.insert(Ret.Features.end(), ArchFeatures.begin(),
+ ArchFeatures.end());
+ }
+
+ if (!Ret.CPU.empty())
+ Ret.Duplicate = "arch=";
+ else if (ArchValue == "la64v1.0" || ArchValue == "la64v1.1")
+ Ret.CPU = "loongarch64";
+ else
+ Ret.CPU = ArchValue;
+ } else {
+ Ret.Features.push_back("!arch=" + ArchValue.str());
+ }
+ } else if (Feature.starts_with("tune=")) {
+ if (!Ret.Tune.empty())
+ Ret.Duplicate = "tune=";
+ else
+ Ret.Tune = Feature.split("=").second.trim();
+ } else if (Feature.starts_with("no-")) {
+ Ret.Features.push_back("-" + Feature.split("-").second.str());
+ } else {
+ Ret.Features.push_back("+" + Feature.str());
+ }
+ }
+ return Ret;
+}
+
bool LoongArchTargetInfo::isValidCPUName(StringRef Name) const {
return llvm::LoongArch::isValidCPUName(Name);
}
@@ -396,3 +441,7 @@ void LoongArchTargetInfo::fillValidCPUList(
SmallVectorImpl<StringRef> &Values) const {
llvm::LoongArch::fillValidCPUList(Values);
}
+
+bool LoongArchTargetInfo::isValidFeatureName(StringRef Name) const {
+ return llvm::LoongArch::isValidFeatureName(Name);
+}
diff --git a/clang/lib/Basic/Targets/LoongArch.h
b/clang/lib/Basic/Targets/LoongArch.h
index 4c7b53abfef9b..a83bb925bc310 100644
--- a/clang/lib/Basic/Targets/LoongArch.h
+++ b/clang/lib/Basic/Targets/LoongArch.h
@@ -101,6 +101,9 @@ class LLVM_LIBRARY_VISIBILITY LoongArchTargetInfo : public
TargetInfo {
bool handleTargetFeatures(std::vector<std::string> &Features,
DiagnosticsEngine &Diags) override;
+ ParsedTargetAttr parseTargetAttr(StringRef Str) const override;
+ bool supportsTargetAttributeTune() const override { return true; }
+
bool
initFeatureMap(llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags,
StringRef CPU,
@@ -110,6 +113,7 @@ class LLVM_LIBRARY_VISIBILITY LoongArchTargetInfo : public
TargetInfo {
bool isValidCPUName(StringRef Name) const override;
void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
+ bool isValidFeatureName(StringRef Name) const override;
};
class LLVM_LIBRARY_VISIBILITY LoongArch32TargetInfo
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 4d7f0455444f1..8e44e2e44bb24 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3195,6 +3195,17 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc,
StringRef AttrStr) {
}
}
+ if (Context.getTargetInfo().getTriple().isLoongArch()) {
+ for (const auto &Feature : ParsedAttrs.Features) {
+ StringRef CurFeature = Feature;
+ if (CurFeature.starts_with("!arch=")) {
+ StringRef ArchValue = CurFeature.split("=").second.trim();
+ return Diag(LiteralLoc, diag::err_attribute_unsupported)
+ << "target(arch=..)" << ArchValue;
+ }
+ }
+ }
+
if (ParsedAttrs.Duplicate != "")
return Diag(LiteralLoc, diag::warn_unsupported_target_attribute)
<< Duplicate << None << ParsedAttrs.Duplicate << Target;
diff --git a/clang/test/CodeGen/LoongArch/targetattr.c
b/clang/test/CodeGen/LoongArch/targetattr.c
new file mode 100644
index 0000000000000..a99e12051452b
--- /dev/null
+++ b/clang/test/CodeGen/LoongArch/targetattr.c
@@ -0,0 +1,92 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
UTC_ARGS: --check-globals all --version 5
+// RUN: %clang --target=loongarch64-linux-gnu %s -S -emit-llvm -o - \
+// RUN: | FileCheck %s
+
+__attribute__((target("div32")))
+// CHECK-LABEL: define dso_local void @testdiv32(
+// CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testdiv32() {}
+
+__attribute__((target("arch=loongarch64")))
+// CHECK-LABEL: define dso_local void @testLoongarch64(
+// CHECK-SAME: ) #[[ATTR1:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testLoongarch64() {}
+
+__attribute__((target("arch=la64v1.0")))
+// CHECK-LABEL: define dso_local void @testLa64v10(
+// CHECK-SAME: ) #[[ATTR1]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testLa64v10() {}
+
+__attribute__((target("arch=la64v1.1")))
+// CHECK-LABEL: define dso_local void @testLa64v11(
+// CHECK-SAME: ) #[[ATTR2:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testLa64v11() {}
+
+__attribute__((target("arch=la464")))
+// CHECK-LABEL: define dso_local void @testLa464(
+// CHECK-SAME: ) #[[ATTR3:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testLa464() {}
+
+__attribute__((target("arch=la664")))
+// CHECK-LABEL: define dso_local void @testLa664(
+// CHECK-SAME: ) #[[ATTR4:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void testLa664() {}
+
+__attribute__((target("arch=la664, no-div32")))
+// CHECK-LABEL: define dso_local void @la664Nodiv32(
+// CHECK-SAME: ) #[[ATTR5:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void la664Nodiv32() {}
+
+__attribute__((target("tune=la464")))
+// CHECK-LABEL: define dso_local void @tuneLa664(
+// CHECK-SAME: ) #[[ATTR6:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void tuneLa664() {}
+
+__attribute__((target("arch=la464, tune=la664")))
+// CHECK-LABEL: define dso_local void @archLa464tuneLa664(
+// CHECK-SAME: ) #[[ATTR7:[0-9]+]] {
+// CHECK-NEXT: [[ENTRY:.*:]]
+// CHECK-NEXT: ret void
+//
+void archLa464tuneLa664() {}
+
+//.
+// CHECK: attributes #[[ATTR0]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="loongarch64"
"target-features"="+64bit,+d,+div32,+f,+lsx,+ual" }
+// CHECK: attributes #[[ATTR1]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="loongarch64"
"target-features"="+64bit,+d,+f,+lsx,+ual" }
+// CHECK: attributes #[[ATTR2]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="loongarch64"
"target-features"="+64bit,+d,+div32,+f,+frecipe,+lam-bh,+lamcas,+ld-seq-sa,+lsx,+scq,+ual"
}
+// CHECK: attributes #[[ATTR3]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="la464"
"target-features"="+64bit,+d,+f,+lasx,+lsx,+ual" }
+// CHECK: attributes #[[ATTR4]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="la664"
"target-features"="+64bit,+d,+div32,+f,+frecipe,+lam-bh,+lamcas,+lasx,+ld-seq-sa,+lsx,+scq,+ual"
}
+// CHECK: attributes #[[ATTR5]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="la664"
"target-features"="+64bit,+d,+f,+frecipe,+lam-bh,+lamcas,+lasx,+ld-seq-sa,+lsx,+scq,+ual,-div32"
}
+// CHECK: attributes #[[ATTR6]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="loongarch64"
"target-features"="+64bit,+d,+f,+lsx,+ual" "tune-cpu"="la464" }
+// CHECK: attributes #[[ATTR7]] = { noinline nounwind optnone
"frame-pointer"="all" "no-trapping-math"="true"
"stack-protector-buffer-size"="8" "target-cpu"="la464"
"target-features"="+64bit,+d,+f,+lasx,+lsx,+ual" "tune-cpu"="la664" }
+//.
+// CHECK: [[META0:![0-9]+]] = !{i32 1, !"wchar_size", i32 4}
+// CHECK: [[META1:![0-9]+]] = !{i32 8, !"PIC Level", i32 2}
+// CHECK: [[META2:![0-9]+]] = !{i32 7, !"PIE Level", i32 2}
+// CHECK: [[META3:![0-9]+]] = !{i32 7, !"frame-pointer", i32 2}
+// CHECK: [[META4:![0-9]+]] = !{!"{{.*}}clang version {{.*}}"}
+//.
diff --git a/clang/test/Sema/attr-target-loongarch.c
b/clang/test/Sema/attr-target-loongarch.c
new file mode 100644
index 0000000000000..77f13e891ea63
--- /dev/null
+++ b/clang/test/Sema/attr-target-loongarch.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple loongarch64-linux-gnu -fsyntax-only -verify %s
+
+// expected-error@+1 {{function multiversioning is not supported on the
current target}}
+void __attribute__((target("default"))) bar(void){}
+
+// expected-error@+1 {{target(arch=..) attribute is not supported on targets
missing invalid; specify an appropriate -march= or -mcpu=}}
+void __attribute__((target("arch=invalid"))) foo(void){}
+
+//expected-warning@+1 {{unsupported 'aaa' in the 'target' attribute string;
'target' attribute ignored}}
+int __attribute__((target("aaa"))) test_feature(void) { return 4; }
+
+//expected-warning@+1 {{unsupported 'aaa' in the 'target' attribute string;
'target' attribute ignored}}
+int __attribute__((target("no-aaa"))) test_nofeature(void) { return 4; }
+
+//expected-warning@+1 {{duplicate 'arch=' in the 'target' attribute string;
'target' attribute ignored}}
+int __attribute__((target("arch=la464,arch=la664"))) test_duplarch(void) {
return 4; }
+
+//expected-warning@+1 {{unknown tune CPU 'la64v1.0' in the 'target' attribute
string; 'target' attribute ignored}}
+int __attribute__((target("tune=la64v1.0"))) test_tune(void) { return 4; }
diff --git a/llvm/include/llvm/TargetParser/LoongArchTargetParser.h
b/llvm/include/llvm/TargetParser/LoongArchTargetParser.h
index e08e7bc182e11..c425ce271c559 100644
--- a/llvm/include/llvm/TargetParser/LoongArchTargetParser.h
+++ b/llvm/include/llvm/TargetParser/LoongArchTargetParser.h
@@ -85,6 +85,7 @@ struct ArchInfo {
};
bool isValidArchName(StringRef Arch);
+bool isValidFeatureName(StringRef Arch);
bool getArchFeatures(StringRef Arch, std::vector<StringRef> &Features);
bool isValidCPUName(StringRef TuneCPU);
void fillValidCPUList(SmallVectorImpl<StringRef> &Values);
diff --git a/llvm/lib/TargetParser/LoongArchTargetParser.cpp
b/llvm/lib/TargetParser/LoongArchTargetParser.cpp
index e394c0c15b207..7bd1711538d25 100644
--- a/llvm/lib/TargetParser/LoongArchTargetParser.cpp
+++ b/llvm/lib/TargetParser/LoongArchTargetParser.cpp
@@ -34,6 +34,17 @@ bool LoongArch::isValidArchName(StringRef Arch) {
return false;
}
+bool LoongArch::isValidFeatureName(StringRef Feature) {
+ Feature = Feature.starts_with("+") ? Feature.drop_front() : Feature;
+ for (const auto F : AllFeatures) {
+ StringRef CanonicalName =
+ F.Name.starts_with("+") ? F.Name.drop_front() : F.Name;
+ if (CanonicalName == Feature)
+ return true;
+ }
+ return false;
+}
+
bool LoongArch::getArchFeatures(StringRef Arch,
std::vector<StringRef> &Features) {
for (const auto A : AllArchs) {
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