Reland "[LoongArch] Support -march=native and -mtune="

As described in [1][2], `-mtune=` is used to select the type of target microarchitecture, defaults to the value of `-march`. The set of possible values should be a superset of `-march` values. Currently possible values of `-march=` and `-mtune=` are `native`, `loongarch64` and `la464`. D136146 has supported `-march={loongarch64,la464}` and this patch adds support for `-march=native` and `-mtune=`. A new ProcessorModel called `loongarch64` is defined in LoongArch.td to support `-mtune=loongarch64`. `llvm::sys::getHostCPUName()` returns `generic` on unknown or future LoongArch CPUs, e.g. the not yet added `la664`, leading to `llvm::LoongArch::isValidArchName()` failing to parse the arch name. In this case, use `loongarch64` as the default arch name for 64-bit CPUs. And these two preprocessor macros are defined: - __loongarch_arch - __loongarch_tune [1]: https://github.com/loongson/LoongArch-Documentation/blob/2023.04.20/docs/LoongArch-toolchain-conventions-EN.adoc [2]: https://github.com/loongson/la-softdev-convention/blob/v0.1/la-softdev-convention.adoc Reviewed By: xen0n, wangleiat Differential Revision: https://reviews.llvm.org/D155824
llvm · Jul 26, 2023 · c56514f · c56514f
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diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
@@ -139,6 +139,9 @@ Windows Support
 LoongArch Support
 ^^^^^^^^^^^^^^^^^
 
+- The ``-march=native`` ``-mtune=`` options and ``__loongarch_{arch,tune}``
+  macros are now supported.
+
 RISC-V Support
 ^^^^^^^^^^^^^^
 

diff --git a/clang/lib/Basic/Targets/LoongArch.cpp b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -15,7 +15,7 @@
 #include "clang/Basic/MacroBuilder.h"
 #include "clang/Basic/TargetBuiltins.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/TargetParser/TargetParser.h"
+#include "llvm/TargetParser/LoongArchTargetParser.h"
 
 using namespace clang;
 using namespace clang::targets;
@@ -198,7 +198,19 @@ void LoongArchTargetInfo::getTargetDefines(const LangOptions &Opts,
   else
     Builder.defineMacro("__loongarch_frlen", "0");
 
-  // TODO: define __loongarch_arch and __loongarch_tune.
+  // Define __loongarch_arch.
+  StringRef Arch = llvm::LoongArch::getArch();
+  if (Arch.empty())
+    Arch = llvm::LoongArch::getDefaultArch(GRLen == 64);
+  if (!Arch.empty())
+    Builder.defineMacro("__loongarch_arch", Arch);
+
+  // Define __loongarch_tune.
+  StringRef TuneCPU = llvm::LoongArch::getTuneCPU();
+  if (TuneCPU.empty())
+    TuneCPU = Arch;
+  if (!TuneCPU.empty())
+    Builder.defineMacro("__loongarch_tune", TuneCPU);
 
   StringRef ABI = getABI();
   if (ABI == "lp64d" || ABI == "lp64f" || ABI == "lp64s")
@@ -270,3 +282,12 @@ bool LoongArchTargetInfo::handleTargetFeatures(
   }
   return true;
 }
+
+bool LoongArchTargetInfo::isValidTuneCPUName(StringRef Name) const {
+  return llvm::LoongArch::isValidTuneCPUName(Name);
+}
+
+void LoongArchTargetInfo::fillValidTuneCPUList(
+    SmallVectorImpl<StringRef> &Values) const {
+  llvm::LoongArch::fillValidTuneCPUList(Values);
+}
diff --git a/clang/lib/Basic/Targets/LoongArch.h b/clang/lib/Basic/Targets/LoongArch.h
@@ -80,6 +80,9 @@ class LLVM_LIBRARY_VISIBILITY LoongArchTargetInfo : public TargetInfo {
                  const std::vector<std::string> &FeaturesVec) const override;
 
   bool hasFeature(StringRef Feature) const override;
+
+  bool isValidTuneCPUName(StringRef Name) const override;
+  void fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values) const override;
 };
 
 class LLVM_LIBRARY_VISIBILITY LoongArch32TargetInfo

diff --git a/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp b/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp
@@ -12,6 +12,7 @@
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
 #include "clang/Driver/Options.h"
+#include "llvm/TargetParser/Host.h"
 #include "llvm/TargetParser/LoongArchTargetParser.h"
 
 using namespace clang::driver;
@@ -128,21 +129,29 @@ void loongarch::getLoongArchTargetFeatures(const Driver &D,
                                            std::vector<StringRef> &Features) {
   StringRef ArchName;
   if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
-    if (!llvm::LoongArch::isValidArchName(A->getValue())) {
+    ArchName = A->getValue();
+
+    // Handle -march=native.
+    if (ArchName == "native") {
+      ArchName = llvm::sys::getHostCPUName();
+      if (ArchName == "generic")
+        ArchName = llvm::LoongArch::getDefaultArch(Triple.isLoongArch64());
+    }
+
+    if (!llvm::LoongArch::isValidArchName(ArchName)) {
       D.Diag(clang::diag::err_drv_invalid_arch_name) << A->getAsString(Args);
       return;
     }
-    ArchName = A->getValue();
   }
 
-  // TODO: handle -march=native and -mtune=xx.
-
   // Select a default arch name.
-  if (ArchName.empty() && Triple.isLoongArch64())
-    ArchName = "loongarch64";
+  if (ArchName.empty())
+    ArchName = llvm::LoongArch::getDefaultArch(Triple.isLoongArch64());
 
-  if (!ArchName.empty())
+  if (!ArchName.empty()) {
     llvm::LoongArch::getArchFeatures(ArchName, Features);
+    llvm::LoongArch::setArch(ArchName);
+  }
 
   // Select floating-point features determined by -mdouble-float,
   // -msingle-float, -msoft-float and -mfpu.

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -56,6 +56,7 @@
 #include "llvm/Support/YAMLParser.h"
 #include "llvm/TargetParser/ARMTargetParserCommon.h"
 #include "llvm/TargetParser/Host.h"
+#include "llvm/TargetParser/LoongArchTargetParser.h"
 #include "llvm/TargetParser/RISCVTargetParser.h"
 #include <cctype>
 
@@ -1853,10 +1854,25 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
 
 void Clang::AddLoongArchTargetArgs(const ArgList &Args,
                                    ArgStringList &CmdArgs) const {
+  const llvm::Triple &Triple = getToolChain().getTriple();
+
   CmdArgs.push_back("-target-abi");
-  CmdArgs.push_back(loongarch::getLoongArchABI(getToolChain().getDriver(), Args,
-                                               getToolChain().getTriple())
-                        .data());
+  CmdArgs.push_back(
+      loongarch::getLoongArchABI(getToolChain().getDriver(), Args, Triple)
+          .data());
+
+  // Handle -mtune.
+  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
+    StringRef TuneCPU = A->getValue();
+    if (TuneCPU == "native") {
+      TuneCPU = llvm::sys::getHostCPUName();
+      if (TuneCPU == "generic")
+        TuneCPU = llvm::LoongArch::getDefaultArch(Triple.isLoongArch64());
+    }
+    CmdArgs.push_back("-tune-cpu");
+    CmdArgs.push_back(Args.MakeArgString(TuneCPU));
+    llvm::LoongArch::setTuneCPU(TuneCPU);
+  }
 }
 
 void Clang::AddMIPSTargetArgs(const ArgList &Args,

diff --git a/clang/test/Driver/loongarch-mtune-error.c b/clang/test/Driver/loongarch-mtune-error.c
@@ -0,0 +1,6 @@
+// RUN: not %clang --target=loongarch64 -mtune=invalidcpu -fsyntax-only %s 2>&1 | FileCheck %s
+// RUN: not %clang --target=loongarch64 -mtune=generic -fsyntax-only %s 2>&1 | FileCheck %s
+// RUN: not %clang --target=loongarch64 -mtune=generic-la64 -fsyntax-only %s 2>&1 | FileCheck %s
+
+// CHECK: error: unknown target CPU '{{.*}}'
+// CHECK-NEXT: note: valid target CPU values are: {{.*}}
diff --git a/clang/test/Driver/loongarch-mtune.c b/clang/test/Driver/loongarch-mtune.c
@@ -0,0 +1,16 @@
+// RUN: %clang --target=loongarch64 -mtune=loongarch64 -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefix=CC1ARG -DCPU=loongarch64
+// RUN: %clang --target=loongarch64 -mtune=loongarch64 -S -emit-llvm %s -o - | \
+// RUN:   FileCheck %s --check-prefix=IRATTR -DCPU=loongarch64
+//
+// RUN: %clang --target=loongarch64 -mtune=la464 -fsyntax-only %s -### 2>&1 | \
+// RUN:   FileCheck %s --check-prefix=CC1ARG -DCPU=la464
+// RUN: %clang --target=loongarch64 -mtune=la464 -S -emit-llvm %s -o - | \
+// RUN:   FileCheck %s --check-prefix=IRATTR -DCPU=la464
+
+// CC1ARG: "-tune-cpu" "[[CPU]]"
+// IRATTR: "tune-cpu"="[[CPU]]"
+
+int foo(void) {
+  return 3;
+}
diff --git a/clang/test/Preprocessor/init-loongarch.c b/clang/test/Preprocessor/init-loongarch.c
@@ -787,3 +787,23 @@
 // LA64-FPU0-LP64S: #define __loongarch_lp64 1
 // LA64-FPU0-LP64S-NOT: #define __loongarch_single_float
 // LA64-FPU0-LP64S: #define __loongarch_soft_float 1
+
+/// Check __loongarch_arch and __loongarch_tune.
+
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=loongarch64 -DTUNE=loongarch64 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -march=loongarch64 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=loongarch64 -DTUNE=loongarch64 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -march=la464 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=la464 -DTUNE=la464 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -mtune=loongarch64 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=loongarch64 -DTUNE=loongarch64 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -mtune=la464 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=loongarch64 -DTUNE=la464 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -march=loongarch64 -mtune=la464 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=loongarch64 -DTUNE=la464 %s
+// RUN: %clang --target=loongarch64 -x c -E -dM %s -o - -march=la464 -mtune=loongarch64 | \
+// RUN:   FileCheck --match-full-lines --check-prefix=ARCH-TUNE -DARCH=la464 -DTUNE=loongarch64 %s
+
+// ARCH-TUNE: #define __loongarch_arch [[ARCH]]
+// ARCH-TUNE: #define __loongarch_tune [[TUNE]]
diff --git a/llvm/include/llvm/TargetParser/LoongArchTargetParser.h b/llvm/include/llvm/TargetParser/LoongArchTargetParser.h
@@ -66,9 +66,16 @@ struct ArchInfo {
 
 bool isValidArchName(StringRef Arch);
 bool getArchFeatures(StringRef Arch, std::vector<StringRef> &Features);
+bool isValidTuneCPUName(StringRef TuneCPU);
+void fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values);
+StringRef getDefaultArch(bool Is64Bit);
+void setArch(StringRef Arch);
+StringRef getArch();
+void setTuneCPU(StringRef TuneCPU);
+StringRef getTuneCPU();
 
 } // namespace LoongArch
 
 } // namespace llvm
 
-#endif // LLVM_SUPPORT_LOONGARCHTARGETPARSER_H
+#endif // LLVM_TARGETPARSER_LOONGARCHTARGETPARSER_H
diff --git a/llvm/lib/Target/LoongArch/LoongArch.td b/llvm/lib/Target/LoongArch/LoongArch.td
@@ -117,6 +117,11 @@ include "LoongArchInstrInfo.td"
 def : ProcessorModel<"generic-la32", NoSchedModel, [Feature32Bit]>;
 def : ProcessorModel<"generic-la64", NoSchedModel, [Feature64Bit, FeatureUAL]>;
 
+// Generic 64-bit processor with double-precision floating-point support.
+def : ProcessorModel<"loongarch64", NoSchedModel, [Feature64Bit,
+                                                   FeatureUAL,
+                                                   FeatureBasicD]>;
+
 // Support generic for compatibility with other targets. The triple will be used
 // to change to the appropriate la32/la64 version.
 def : ProcessorModel<"generic", NoSchedModel, []>;

diff --git a/llvm/lib/TargetParser/LoongArchTargetParser.cpp b/llvm/lib/TargetParser/LoongArchTargetParser.cpp
@@ -16,6 +16,9 @@
 using namespace llvm;
 using namespace llvm::LoongArch;
 
+StringRef Arch;
+StringRef TuneCPU;
+
 const FeatureInfo AllFeatures[] = {
 #define LOONGARCH_FEATURE(NAME, KIND) {NAME, KIND},
 #include "llvm/TargetParser/LoongArchTargetParser.def"
@@ -46,3 +49,25 @@ bool LoongArch::getArchFeatures(StringRef Arch,
   }
   return false;
 }
+
+bool LoongArch::isValidTuneCPUName(StringRef TuneCPU) {
+  return isValidArchName(TuneCPU);
+}
+
+void LoongArch::fillValidTuneCPUList(SmallVectorImpl<StringRef> &Values) {
+  for (const auto A : AllArchs)
+    Values.emplace_back(A.Name);
+}
+
+StringRef LoongArch::getDefaultArch(bool Is64Bit) {
+  // TODO: use a real 32-bit arch name.
+  return Is64Bit ? "loongarch64" : "";
+}
+
+void LoongArch::setArch(StringRef Name) { Arch = Name; }
+
+StringRef LoongArch::getArch() { return Arch; }
+
+void LoongArch::setTuneCPU(StringRef Name) { TuneCPU = Name; }
+
+StringRef LoongArch::getTuneCPU() { return TuneCPU; }
diff --git a/llvm/test/CodeGen/LoongArch/cpus-invalid.ll b/llvm/test/CodeGen/LoongArch/cpus-invalid.ll
@@ -0,0 +1,7 @@
+; RUN: llc < %s --mtriple=loongarch64 --mattr=+64bit --mcpu=invalidcpu 2>&1 | FileCheck %s
+
+; CHECK: {{.*}} is not a recognized processor for this target
+
+define void @f() {
+  ret void
+}
diff --git a/llvm/test/CodeGen/LoongArch/cpus.ll b/llvm/test/CodeGen/LoongArch/cpus.ll
@@ -0,0 +1,20 @@
+;; This tests that llc accepts all valid LoongArch CPUs.
+;; Note the 'generic' names have been tested in cpu-name-generic.ll.
+
+; RUN: llc < %s --mtriple=loongarch64 --mcpu=loongarch64 2>&1 | FileCheck %s
+; RUN: llc < %s --mtriple=loongarch64 --mcpu=la464 2>&1 | FileCheck %s
+; RUN: llc < %s --mtriple=loongarch64 2>&1 | FileCheck %s
+
+; CHECK-NOT: {{.*}} is not a recognized processor for this target
+
+define void @f() {
+  ret void
+}
+
+define void @tune_cpu_loongarch64() "tune-cpu"="loongarch64" {
+  ret void
+}
+
+define void @tune_cpu_la464() "tune-cpu"="la464" {
+  ret void
+}