From e3b557809604d036af6e00c60f012c2025b59a5e Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 11 Feb 2023 13:38:04 +0100
Subject: Vendor import of llvm-project main
 llvmorg-16-init-18548-gb0daacf58f41, the last commit before the upstream
 release/17.x branch was created.

---
 llvm/lib/TargetParser/RISCVTargetParser.cpp | 104 ++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 llvm/lib/TargetParser/RISCVTargetParser.cpp

(limited to 'llvm/lib/TargetParser/RISCVTargetParser.cpp')

diff --git a/llvm/lib/TargetParser/RISCVTargetParser.cpp b/llvm/lib/TargetParser/RISCVTargetParser.cpp
new file mode 100644
index 000000000000..89cd5c082d72
--- /dev/null
+++ b/llvm/lib/TargetParser/RISCVTargetParser.cpp
@@ -0,0 +1,104 @@
+//===-- RISCVTargetParser.cpp - Parser for target features ------*- C++ -*-===//
+//
+// 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 implements a target parser to recognise hardware features
+// FOR RISC-V CPUS.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/TargetParser/RISCVTargetParser.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringSwitch.h"
+
+namespace llvm {
+namespace RISCV {
+
+struct CPUInfo {
+  StringLiteral Name;
+  CPUKind Kind;
+  StringLiteral DefaultMarch;
+  bool isInvalid() const { return DefaultMarch.empty(); }
+  bool is64Bit() const { return DefaultMarch.starts_with("rv64"); }
+};
+
+constexpr CPUInfo RISCVCPUInfo[] = {
+#define PROC(ENUM, NAME, DEFAULT_MARCH)                              \
+  {NAME, CK_##ENUM, DEFAULT_MARCH},
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+};
+
+bool checkCPUKind(CPUKind Kind, bool IsRV64) {
+  if (Kind == CK_INVALID)
+    return false;
+  return RISCVCPUInfo[static_cast<unsigned>(Kind)].is64Bit() == IsRV64;
+}
+
+bool checkTuneCPUKind(CPUKind Kind, bool IsRV64) {
+  if (Kind == CK_INVALID)
+    return false;
+#define TUNE_PROC(ENUM, NAME)                                                  \
+  if (Kind == CK_##ENUM)                                                       \
+    return true;
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+  return RISCVCPUInfo[static_cast<unsigned>(Kind)].is64Bit() == IsRV64;
+}
+
+CPUKind parseCPUKind(StringRef CPU) {
+  return llvm::StringSwitch<CPUKind>(CPU)
+#define PROC(ENUM, NAME, DEFAULT_MARCH) .Case(NAME, CK_##ENUM)
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+      .Default(CK_INVALID);
+}
+
+CPUKind parseTuneCPUKind(StringRef TuneCPU, bool IsRV64) {
+  return llvm::StringSwitch<CPUKind>(TuneCPU)
+#define PROC(ENUM, NAME, DEFAULT_MARCH) .Case(NAME, CK_##ENUM)
+#define TUNE_PROC(ENUM, NAME) .Case(NAME, CK_##ENUM)
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+      .Default(CK_INVALID);
+}
+
+StringRef getMArchFromMcpu(StringRef CPU) {
+  CPUKind Kind = parseCPUKind(CPU);
+  return RISCVCPUInfo[static_cast<unsigned>(Kind)].DefaultMarch;
+}
+
+void fillValidCPUArchList(SmallVectorImpl<StringRef> &Values, bool IsRV64) {
+  for (const auto &C : RISCVCPUInfo) {
+    if (C.Kind != CK_INVALID && IsRV64 == C.is64Bit())
+      Values.emplace_back(C.Name);
+  }
+}
+
+void fillValidTuneCPUArchList(SmallVectorImpl<StringRef> &Values, bool IsRV64) {
+  for (const auto &C : RISCVCPUInfo) {
+    if (C.Kind != CK_INVALID && IsRV64 == C.is64Bit())
+      Values.emplace_back(C.Name);
+  }
+#define TUNE_PROC(ENUM, NAME) Values.emplace_back(StringRef(NAME));
+#include "llvm/TargetParser/RISCVTargetParserDef.inc"
+}
+
+// Get all features except standard extension feature
+bool getCPUFeaturesExceptStdExt(CPUKind Kind,
+                                std::vector<StringRef> &Features) {
+  const CPUInfo &Info = RISCVCPUInfo[static_cast<unsigned>(Kind)];
+
+  if (Info.isInvalid())
+    return false;
+
+  if (Info.is64Bit())
+    Features.push_back("+64bit");
+  else
+    Features.push_back("-64bit");
+
+  return true;
+}
+
+} // namespace RISCV
+} // namespace llvm
-- 
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