1 //===--- RISCV.cpp - Implement RISCV target feature support ---------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements RISCV TargetInfo objects.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "RISCV.h"
15 #include "clang/Basic/MacroBuilder.h"
16 #include "llvm/ADT/StringSwitch.h"
17 
18 using namespace clang;
19 using namespace clang::targets;
20 
21 ArrayRef<const char *> RISCVTargetInfo::getGCCRegNames() const {
22   static const char *const GCCRegNames[] = {
23       "x0",  "x1",  "x2",  "x3",  "x4",  "x5",  "x6",  "x7",
24       "x8",  "x9",  "x10", "x11", "x12", "x13", "x14", "x15",
25       "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23",
26       "x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31"};
27   return llvm::makeArrayRef(GCCRegNames);
28 }
29 
30 ArrayRef<TargetInfo::GCCRegAlias> RISCVTargetInfo::getGCCRegAliases() const {
31   static const TargetInfo::GCCRegAlias GCCRegAliases[] = {
32       {{"zero"}, "x0"}, {{"ra"}, "x1"},  {{"sp"}, "x2"},   {{"gp"}, "x3"},
33       {{"tp"}, "x4"},   {{"t0"}, "x5"},  {{"t1"}, "x6"},   {{"t2"}, "x7"},
34       {{"s0"}, "x8"},   {{"s1"}, "x9"},  {{"a0"}, "x10"},  {{"a1"}, "x11"},
35       {{"a2"}, "x12"},  {{"a3"}, "x13"}, {{"a4"}, "x15"},  {{"a5"}, "x15"},
36       {{"a6"}, "x16"},  {{"a7"}, "x17"}, {{"s2"}, "x18"},  {{"s3"}, "x19"},
37       {{"s4"}, "x20"},  {{"s5"}, "x21"}, {{"s6"}, "x22"},  {{"s7"}, "x23"},
38       {{"s8"}, "x24"},  {{"s9"}, "x25"}, {{"s10"}, "x26"}, {{"s11"}, "x27"},
39       {{"t3"}, "x28"},  {{"t4"}, "x29"}, {{"t5"}, "x30"},  {{"t6"}, "x31"}};
40   return llvm::makeArrayRef(GCCRegAliases);
41 }
42 
43 void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
44                                        MacroBuilder &Builder) const {
45   Builder.defineMacro("__ELF__");
46   Builder.defineMacro("__riscv");
47   bool Is64Bit = getTriple().getArch() == llvm::Triple::riscv64;
48   Builder.defineMacro("__riscv_xlen", Is64Bit ? "64" : "32");
49   // TODO: modify when more code models and ABIs are supported.
50   Builder.defineMacro("__riscv_cmodel_medlow");
51   Builder.defineMacro("__riscv_float_abi_soft");
52 
53   if (HasM) {
54     Builder.defineMacro("__riscv_mul");
55     Builder.defineMacro("__riscv_div");
56     Builder.defineMacro("__riscv_muldiv");
57   }
58 
59   if (HasA)
60     Builder.defineMacro("__riscv_atomic");
61 
62   if (HasF || HasD) {
63     Builder.defineMacro("__riscv_flen", HasD ? "64" : "32");
64     Builder.defineMacro("__riscv_fdiv");
65     Builder.defineMacro("__riscv_fsqrt");
66   }
67 
68   if (HasC)
69     Builder.defineMacro("__riscv_compressed");
70 }
71 
72 /// Return true if has this feature, need to sync with handleTargetFeatures.
73 bool RISCVTargetInfo::hasFeature(StringRef Feature) const {
74   bool Is64Bit = getTriple().getArch() == llvm::Triple::riscv64;
75   return llvm::StringSwitch<bool>(Feature)
76       .Case("riscv", true)
77       .Case("riscv32", !Is64Bit)
78       .Case("riscv64", Is64Bit)
79       .Case("m", HasM)
80       .Case("a", HasA)
81       .Case("f", HasF)
82       .Case("d", HasD)
83       .Case("c", HasC)
84       .Default(false);
85 }
86 
87 /// Perform initialization based on the user configured set of features.
88 bool RISCVTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
89                                            DiagnosticsEngine &Diags) {
90   for (const auto &Feature : Features) {
91     if (Feature == "+m")
92       HasM = true;
93     else if (Feature == "+a")
94       HasA = true;
95     else if (Feature == "+f")
96       HasF = true;
97     else if (Feature == "+d")
98       HasD = true;
99     else if (Feature == "+c")
100       HasC = true;
101   }
102 
103   return true;
104 }
105