1 files changed, 142 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp b/contrib/llvm-project/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
new file mode 100644
index 000000000000..fa36234d0f5f
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.cpp
@@ -0,0 +1,142 @@
+//===-- RISCVBaseInfo.cpp - Top level definitions for RISCV MC ------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains small standalone enum definitions for the RISCV target
+// useful for the compiler back-end and the MC libraries.
+//
+//===----------------------------------------------------------------------===//
+
+#include "RISCVBaseInfo.h"
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+namespace RISCVSysReg {
+#define GET_SysRegsList_IMPL
+#include "RISCVGenSearchableTables.inc"
+} // namespace RISCVSysReg
+
+namespace RISCVABI {
+ABI computeTargetABI(const Triple &TT, FeatureBitset FeatureBits,
+                     StringRef ABIName) {
+  auto TargetABI = getTargetABI(ABIName);
+  bool IsRV64 = TT.isArch64Bit();
+  bool IsRV32E = FeatureBits[RISCV::FeatureRV32E];
+
+  if (!ABIName.empty() && TargetABI == ABI_Unknown) {
+    errs()
+        << "'" << ABIName
+        << "' is not a recognized ABI for this target (ignoring target-abi)\n";
+  } else if (ABIName.startswith("ilp32") && IsRV64) {
+    errs() << "32-bit ABIs are not supported for 64-bit targets (ignoring "
+              "target-abi)\n";
+    TargetABI = ABI_Unknown;
+  } else if (ABIName.startswith("lp64") && !IsRV64) {
+    errs() << "64-bit ABIs are not supported for 32-bit targets (ignoring "
+              "target-abi)\n";
+    TargetABI = ABI_Unknown;
+  } else if (IsRV32E && TargetABI != ABI_ILP32E && TargetABI != ABI_Unknown) {
+    // TODO: move this checking to RISCVTargetLowering and RISCVAsmParser
+    errs()
+        << "Only the ilp32e ABI is supported for RV32E (ignoring target-abi)\n";
+    TargetABI = ABI_Unknown;
+  }
+
+  if (TargetABI != ABI_Unknown)
+    return TargetABI;
+
+  // For now, default to the ilp32/ilp32e/lp64 ABI if no explicit ABI is given
+  // or an invalid/unrecognised string is given. In the future, it might be
+  // worth changing this to default to ilp32f/lp64f and ilp32d/lp64d when
+  // hardware support for floating point is present.
+  if (IsRV32E)
+    return ABI_ILP32E;
+  if (IsRV64)
+    return ABI_LP64;
+  return ABI_ILP32;
+}
+
+ABI getTargetABI(StringRef ABIName) {
+  auto TargetABI = StringSwitch<ABI>(ABIName)
+                       .Case("ilp32", ABI_ILP32)
+                       .Case("ilp32f", ABI_ILP32F)
+                       .Case("ilp32d", ABI_ILP32D)
+                       .Case("ilp32e", ABI_ILP32E)
+                       .Case("lp64", ABI_LP64)
+                       .Case("lp64f", ABI_LP64F)
+                       .Case("lp64d", ABI_LP64D)
+                       .Default(ABI_Unknown);
+  return TargetABI;
+}
+
+// To avoid the BP value clobbered by a function call, we need to choose a
+// callee saved register to save the value. RV32E only has X8 and X9 as callee
+// saved registers and X8 will be used as fp. So we choose X9 as bp.
+MCRegister getBPReg() { return RISCV::X9; }
+
+// Returns the register holding shadow call stack pointer.
+MCRegister getSCSPReg() { return RISCV::X18; }
+
+} // namespace RISCVABI
+
+namespace RISCVFeatures {
+
+void validate(const Triple &TT, const FeatureBitset &FeatureBits) {
+  if (TT.isArch64Bit() && FeatureBits[RISCV::FeatureRV32E])
+    report_fatal_error("RV32E can't be enabled for an RV64 target");
+}
+
+} // namespace RISCVFeatures
+
+namespace RISCVVPseudosTable {
+
+#define GET_RISCVVPseudosTable_IMPL
+#include "RISCVGenSearchableTables.inc"
+
+} // namespace RISCVVPseudosTable
+
+void RISCVVType::printVType(unsigned VType, raw_ostream &OS) {
+  RISCVVSEW VSEW = getVSEW(VType);
+  RISCVVLMUL VLMUL = getVLMUL(VType);
+
+  unsigned Sew = 1 << (static_cast<unsigned>(VSEW) + 3);
+  OS << "e" << Sew;
+
+  switch (VLMUL) {
+  case RISCVVLMUL::LMUL_RESERVED:
+    llvm_unreachable("Unexpected LMUL value!");
+  case RISCVVLMUL::LMUL_1:
+  case RISCVVLMUL::LMUL_2:
+  case RISCVVLMUL::LMUL_4:
+  case RISCVVLMUL::LMUL_8: {
+    unsigned LMul = 1 << static_cast<unsigned>(VLMUL);
+    OS << ",m" << LMul;
+    break;
+  }
+  case RISCVVLMUL::LMUL_F2:
+  case RISCVVLMUL::LMUL_F4:
+  case RISCVVLMUL::LMUL_F8: {
+    unsigned LMul = 1 << (8 - static_cast<unsigned>(VLMUL));
+    OS << ",mf" << LMul;
+    break;
+  }
+  }
+
+  if (isTailAgnostic(VType))
+    OS << ",ta";
+  else
+    OS << ",tu";
+
+  if (isMaskAgnostic(VType))
+    OS << ",ma";
+  else
+    OS << ",mu";
+}
+
+} // namespace llvm