Revert "[Exegesis][RISCV] Add RISCV support for llvm-exegesis (#120419)"

This reverts commit 6993d32.

Reason: buildbot breakage
(https://lab.llvm.org/buildbot/#/builders/51/builds/7908)

CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /home/b/sanitizer-aarch64-linux/build/llvm_build0/bin/clang++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/b/sanitizer-aarch64-linux/build/build_default/tools/llvm-exegesis/lib/RISCV -I/home/b/sanitizer-aarch64-linux/build/llvm-project/llvm/tools/llvm-exegesis/lib/RISCV -I/home/b/sanitizer-aarch64-linux/build/build_default/include -I/home/b/sanitizer-aarch64-linux/build/llvm-project/llvm/include -I/home/b/sanitizer-aarch64-linux/build/llvm-project/llvm/lib/Target/RISCV -I/home/b/sanitizer-aarch64-linux/build/build_default/lib/Target/RISCV -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT tools/llvm-exegesis/lib/RISCV/CMakeFiles/LLVMExegesisRISCV.dir/Target.cpp.o -MF tools/llvm-exegesis/lib/RISCV/CMakeFiles/LLVMExegesisRISCV.dir/Target.cpp.o.d -o tools/llvm-exegesis/lib/RISCV/CMakeFiles/LLVMExegesisRISCV.dir/Target.cpp.o -c /home/b/sanitizer-aarch64-linux/build/llvm-project/llvm/tools/llvm-exegesis/lib/RISCV/Target.cpp
In file included from /home/b/sanitizer-aarch64-linux/build/llvm-project/llvm/tools/llvm-exegesis/lib/RISCV/Target.cpp:139:
/home/b/sanitizer-aarch64-linux/build/build_default/lib/Target/RISCV/RISCVGenAsmMatcher.inc:239:19: error: unused function 'MatchRegisterName' [-Werror,-Wunused-function]
  239 | static MCRegister MatchRegisterName(StringRef Name) {
      |                   ^~~~~~~~~~~~~~~~~
/home/b/sanitizer-aarch64-linux/build/build_default/lib/Target/RISCV/RISCVGenAsmMatcher.inc:568:19: error: unused function 'MatchRegisterAltName' [-Werror,-Wunused-function]
  568 | static MCRegister MatchRegisterAltName(StringRef Name) {
      |                   ^~~~~~~~~~~~~~~~~~~~

Author: thurstond

llvm/test/tools/llvm-exegesis/RISCV/latency-by-extension-A.s

@@ -12,9 +12,6 @@ endif()
 if (LLVM_TARGETS_TO_BUILD MATCHES "Mips")
   list(APPEND LLVM_EXEGESIS_TARGETS "Mips")
 endif()
-if(LLVM_TARGETS_TO_BUILD MATCHES "RISCV")
-  list(APPEND LLVM_EXEGESIS_TARGETS "RISCV")
-endif()
 
 set(LLVM_EXEGESIS_TARGETS ${LLVM_EXEGESIS_TARGETS} PARENT_SCOPE)
 

llvm/test/tools/llvm-exegesis/RISCV/latency-by-extension-C.s

@@ -95,12 +95,11 @@ Instruction::Instruction(const MCInstrDesc *Description, StringRef Name,
                          const BitVector *ImplDefRegs,
                          const BitVector *ImplUseRegs,
                          const BitVector *AllDefRegs,
-                         const BitVector *AllUseRegs,
-                         const BitVector *NonMemoryRegs)
+                         const BitVector *AllUseRegs)
     : Description(*Description), Name(Name), Operands(std::move(Operands)),
       Variables(std::move(Variables)), ImplDefRegs(*ImplDefRegs),
       ImplUseRegs(*ImplUseRegs), AllDefRegs(*AllDefRegs),
-      AllUseRegs(*AllUseRegs), NonMemoryRegs(*NonMemoryRegs) {}
+      AllUseRegs(*AllUseRegs) {}
 
 std::unique_ptr<Instruction>
 Instruction::create(const MCInstrInfo &InstrInfo,
@@ -167,8 +166,6 @@ Instruction::create(const MCInstrInfo &InstrInfo,
   BitVector ImplUseRegs = RATC.emptyRegisters();
   BitVector AllDefRegs = RATC.emptyRegisters();
   BitVector AllUseRegs = RATC.emptyRegisters();
-  BitVector NonMemoryRegs = RATC.emptyRegisters();
-
   for (const auto &Op : Operands) {
     if (Op.isReg()) {
       const auto &AliasingBits = Op.getRegisterAliasing().aliasedBits();
@@ -180,8 +177,6 @@ Instruction::create(const MCInstrInfo &InstrInfo,
         ImplDefRegs |= AliasingBits;
       if (Op.isUse() && Op.isImplicit())
         ImplUseRegs |= AliasingBits;
-      if (Op.isUse() && !Op.isMemory())
-        NonMemoryRegs |= AliasingBits;
     }
   }
   // Can't use make_unique because constructor is private.
@@ -190,8 +185,7 @@ Instruction::create(const MCInstrInfo &InstrInfo,
       std::move(Variables), BVC.getUnique(std::move(ImplDefRegs)),
       BVC.getUnique(std::move(ImplUseRegs)),
       BVC.getUnique(std::move(AllDefRegs)),
-      BVC.getUnique(std::move(AllUseRegs)),
-      BVC.getUnique(std::move(NonMemoryRegs))));
+      BVC.getUnique(std::move(AllUseRegs))));
 }
 
 const Operand &Instruction::getPrimaryOperand(const Variable &Var) const {
@@ -246,12 +240,6 @@ bool Instruction::hasAliasingRegisters(
                                      ForbiddenRegisters);
 }
 
-bool Instruction::hasAliasingNotMemoryRegisters(
-    const BitVector &ForbiddenRegisters) const {
-  return anyCommonExcludingForbidden(AllDefRegs, NonMemoryRegs,
-                                     ForbiddenRegisters);
-}
-
 bool Instruction::hasOneUseOrOneDef() const {
   return AllDefRegs.count() || AllUseRegs.count();
 }

llvm/test/tools/llvm-exegesis/RISCV/latency-by-opcode-name-FADD_D.s

@@ -133,12 +133,6 @@ struct Instruction {
   // aliasing Use and Def registers.
   bool hasAliasingRegisters(const BitVector &ForbiddenRegisters) const;
 
-  // Whether this instruction is self aliasing through some registers.
-  // Repeating this instruction may execute sequentially by picking aliasing
-  // Def and Not Memory Use registers. It may also execute in parallel by
-  // picking non aliasing Def and Not Memory Use registers.
-  bool hasAliasingNotMemoryRegisters(const BitVector &ForbiddenRegisters) const;
-
   // Whether this instruction's registers alias with OtherInstr's registers.
   bool hasAliasingRegistersThrough(const Instruction &OtherInstr,
                                    const BitVector &ForbiddenRegisters) const;
@@ -166,15 +160,12 @@ struct Instruction {
   const BitVector &ImplUseRegs; // The set of aliased implicit use registers.
   const BitVector &AllDefRegs;  // The set of all aliased def registers.
   const BitVector &AllUseRegs;  // The set of all aliased use registers.
-  // The set of all aliased not memory use registers.
-  const BitVector &NonMemoryRegs;
-
 private:
   Instruction(const MCInstrDesc *Description, StringRef Name,
               SmallVector<Operand, 8> Operands,
               SmallVector<Variable, 4> Variables, const BitVector *ImplDefRegs,
               const BitVector *ImplUseRegs, const BitVector *AllDefRegs,
-              const BitVector *AllUseRegs, const BitVector *NonMemoryRegs);
+              const BitVector *AllUseRegs);
 };
 
 // Instructions are expensive to instantiate. This class provides a cache of