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

This reverts commit c56514f. This
commit adds global state that is shared between clang driver and clang
cc1, which is not correct when clang is used with `-fno-integrated-cc1`
option (no integrated cc1). The -march and -mtune option needs to be
properly passed through cc1 command-line and stored in TargetInfo.

clang/docs/ReleaseNotes.rst

@@ -156,9 +156,6 @@ Windows Support
 LoongArch Support
 ^^^^^^^^^^^^^^^^^
 
-- The ``-march=native`` ``-mtune=`` options and ``__loongarch_{arch,tune}``
-  macros are now supported.
-
 RISC-V Support
 ^^^^^^^^^^^^^^
 

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/LoongArchTargetParser.h"
+#include "llvm/TargetParser/TargetParser.h"
 
 using namespace clang;
 using namespace clang::targets;
@@ -198,19 +198,7 @@ void LoongArchTargetInfo::getTargetDefines(const LangOptions &Opts,
   else
     Builder.defineMacro("__loongarch_frlen", "0");
 
-  // 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);
+  // TODO: define __loongarch_arch and __loongarch_tune.
 
   StringRef ABI = getABI();
   if (ABI == "lp64d" || ABI == "lp64f" || ABI == "lp64s")
@@ -282,12 +270,3 @@ 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);
-}

clang/lib/Basic/Targets/LoongArch.h

@@ -80,9 +80,6 @@ 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

clang/lib/Driver/ToolChains/Arch/LoongArch.cpp

@@ -12,7 +12,6 @@
 #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;
@@ -129,29 +128,21 @@ void loongarch::getLoongArchTargetFeatures(const Driver &D,
                                            std::vector<StringRef> &Features) {
   StringRef ArchName;
   if (const Arg *A = Args.getLastArg(options::OPT_march_EQ)) {
-    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)) {
+    if (!llvm::LoongArch::isValidArchName(A->getValue())) {
       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())
-    ArchName = llvm::LoongArch::getDefaultArch(Triple.isLoongArch64());
+  if (ArchName.empty() && Triple.isLoongArch64())
+    ArchName = "loongarch64";
 
-  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.

clang/lib/Driver/ToolChains/Clang.cpp

@@ -56,7 +56,6 @@
 #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>
 
@@ -1854,25 +1853,10 @@ 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, 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);
-  }
+  CmdArgs.push_back(loongarch::getLoongArchABI(getToolChain().getDriver(), Args,
+                                               getToolChain().getTriple())
+                        .data());
 }
 
 void Clang::AddMIPSTargetArgs(const ArgList &Args,

clang/test/Preprocessor/init-loongarch.c

@@ -787,23 +787,3 @@
 // 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]]

llvm/include/llvm/TargetParser/LoongArchTargetParser.h

@@ -66,16 +66,9 @@ 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_TARGETPARSER_LOONGARCHTARGETPARSER_H
+#endif // LLVM_SUPPORT_LOONGARCHTARGETPARSER_H

llvm/lib/Target/LoongArch/LoongArch.td

@@ -117,11 +117,6 @@ 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, []>;

llvm/lib/TargetParser/LoongArchTargetParser.cpp

@@ -16,9 +16,6 @@
 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"
@@ -49,25 +46,3 @@ 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; }