1 //===--- PPC.cpp - PPC Helpers for Tools ------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "PPC.h"
10 #include "ToolChains/CommonArgs.h"
11 #include "clang/Driver/Driver.h"
12 #include "clang/Driver/DriverDiagnostic.h"
13 #include "clang/Driver/Options.h"
14 #include "llvm/ADT/StringSwitch.h"
15 #include "llvm/Option/ArgList.h"
16 #include "llvm/Support/Host.h"
17
18 using namespace clang::driver;
19 using namespace clang::driver::tools;
20 using namespace clang;
21 using namespace llvm::opt;
22
getPPCGenericTargetCPU(const llvm::Triple & T)23 static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
24 // LLVM may default to generating code for the native CPU,
25 // but, like gcc, we default to a more generic option for
26 // each architecture. (except on AIX)
27 if (T.isOSAIX())
28 return "pwr7";
29 else if (T.getArch() == llvm::Triple::ppc64le)
30 return "ppc64le";
31 else if (T.getArch() == llvm::Triple::ppc64)
32 return "ppc64";
33 else
34 return "ppc";
35 }
36
normalizeCPUName(StringRef CPUName,const llvm::Triple & T)37 static std::string normalizeCPUName(StringRef CPUName, const llvm::Triple &T) {
38 // Clang/LLVM does not actually support code generation
39 // for the 405 CPU. However, there are uses of this CPU ID
40 // in projects that previously used GCC and rely on Clang
41 // accepting it. Clang has always ignored it and passed the
42 // generic CPU ID to the back end.
43 if (CPUName == "generic" || CPUName == "405")
44 return getPPCGenericTargetCPU(T);
45
46 if (CPUName == "native") {
47 std::string CPU = std::string(llvm::sys::getHostCPUName());
48 if (!CPU.empty() && CPU != "generic")
49 return CPU;
50 else
51 return getPPCGenericTargetCPU(T);
52 }
53
54 return llvm::StringSwitch<const char *>(CPUName)
55 .Case("common", "generic")
56 .Case("440fp", "440")
57 .Case("630", "pwr3")
58 .Case("G3", "g3")
59 .Case("G4", "g4")
60 .Case("G4+", "g4+")
61 .Case("8548", "e500")
62 .Case("G5", "g5")
63 .Case("power3", "pwr3")
64 .Case("power4", "pwr4")
65 .Case("power5", "pwr5")
66 .Case("power5x", "pwr5x")
67 .Case("power6", "pwr6")
68 .Case("power6x", "pwr6x")
69 .Case("power7", "pwr7")
70 .Case("power8", "pwr8")
71 .Case("power9", "pwr9")
72 .Case("power10", "pwr10")
73 .Case("future", "future")
74 .Case("powerpc", "ppc")
75 .Case("powerpc64", "ppc64")
76 .Case("powerpc64le", "ppc64le")
77 .Default(CPUName.data());
78 }
79
80 /// Get the (LLVM) name of the PowerPC cpu we are tuning for.
getPPCTuneCPU(const ArgList & Args,const llvm::Triple & T)81 std::string ppc::getPPCTuneCPU(const ArgList &Args, const llvm::Triple &T) {
82 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))
83 return normalizeCPUName(A->getValue(), T);
84 return getPPCGenericTargetCPU(T);
85 }
86
87 /// Get the (LLVM) name of the PowerPC cpu we are targeting.
getPPCTargetCPU(const ArgList & Args,const llvm::Triple & T)88 std::string ppc::getPPCTargetCPU(const ArgList &Args, const llvm::Triple &T) {
89 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ))
90 return normalizeCPUName(A->getValue(), T);
91 return getPPCGenericTargetCPU(T);
92 }
93
getPPCAsmModeForCPU(StringRef Name)94 const char *ppc::getPPCAsmModeForCPU(StringRef Name) {
95 return llvm::StringSwitch<const char *>(Name)
96 .Case("pwr7", "-mpower7")
97 .Case("power7", "-mpower7")
98 .Case("pwr8", "-mpower8")
99 .Case("power8", "-mpower8")
100 .Case("ppc64le", "-mpower8")
101 .Case("pwr9", "-mpower9")
102 .Case("power9", "-mpower9")
103 .Case("pwr10", "-mpower10")
104 .Case("power10", "-mpower10")
105 .Default("-many");
106 }
107
getPPCTargetFeatures(const Driver & D,const llvm::Triple & Triple,const ArgList & Args,std::vector<StringRef> & Features)108 void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
109 const ArgList &Args,
110 std::vector<StringRef> &Features) {
111 if (Triple.getSubArch() == llvm::Triple::PPCSubArch_spe)
112 Features.push_back("+spe");
113
114 handleTargetFeaturesGroup(Args, Features, options::OPT_m_ppc_Features_Group);
115
116 ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
117 if (FloatABI == ppc::FloatABI::Soft)
118 Features.push_back("-hard-float");
119
120 ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Triple, Args);
121 if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt)
122 Features.push_back("+secure-plt");
123 }
124
getPPCReadGOTPtrMode(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)125 ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple,
126 const ArgList &Args) {
127 if (Args.getLastArg(options::OPT_msecure_plt))
128 return ppc::ReadGOTPtrMode::SecurePlt;
129 if ((Triple.isOSFreeBSD() && Triple.getOSMajorVersion() >= 13) ||
130 Triple.isOSNetBSD() || Triple.isOSOpenBSD() || Triple.isMusl())
131 return ppc::ReadGOTPtrMode::SecurePlt;
132 else
133 return ppc::ReadGOTPtrMode::Bss;
134 }
135
getPPCFloatABI(const Driver & D,const ArgList & Args)136 ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
137 ppc::FloatABI ABI = ppc::FloatABI::Invalid;
138 if (Arg *A =
139 Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
140 options::OPT_mfloat_abi_EQ)) {
141 if (A->getOption().matches(options::OPT_msoft_float))
142 ABI = ppc::FloatABI::Soft;
143 else if (A->getOption().matches(options::OPT_mhard_float))
144 ABI = ppc::FloatABI::Hard;
145 else {
146 ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
147 .Case("soft", ppc::FloatABI::Soft)
148 .Case("hard", ppc::FloatABI::Hard)
149 .Default(ppc::FloatABI::Invalid);
150 if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
151 D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
152 ABI = ppc::FloatABI::Hard;
153 }
154 }
155 }
156
157 // If unspecified, choose the default based on the platform.
158 if (ABI == ppc::FloatABI::Invalid) {
159 ABI = ppc::FloatABI::Hard;
160 }
161
162 return ABI;
163 }
164
hasPPCAbiArg(const ArgList & Args,const char * Value)165 bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) {
166 Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
167 return A && (A->getValue() == StringRef(Value));
168 }
169