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//===--- PPC.cpp - PPC Helpers for Tools ------------------------*- 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
//
//===----------------------------------------------------------------------===//
#include "PPC.h"
#include "ToolChains/CommonArgs.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Host.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;
static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
// LLVM may default to generating code for the native CPU,
// but, like gcc, we default to a more generic option for
// each architecture. (except on AIX)
if (T.isOSAIX())
return "pwr7";
else if (T.getArch() == llvm::Triple::ppc64le)
return "ppc64le";
else if (T.getArch() == llvm::Triple::ppc64)
return "ppc64";
else
return "ppc";
}
static std::string normalizeCPUName(StringRef CPUName, const llvm::Triple &T) {
// Clang/LLVM does not actually support code generation
// for the 405 CPU. However, there are uses of this CPU ID
// in projects that previously used GCC and rely on Clang
// accepting it. Clang has always ignored it and passed the
// generic CPU ID to the back end.
if (CPUName == "generic" || CPUName == "405")
return getPPCGenericTargetCPU(T);
if (CPUName == "native") {
std::string CPU = std::string(llvm::sys::getHostCPUName());
if (!CPU.empty() && CPU != "generic")
return CPU;
else
return getPPCGenericTargetCPU(T);
}
return llvm::StringSwitch<const char *>(CPUName)
.Case("common", "generic")
.Case("440fp", "440")
.Case("630", "pwr3")
.Case("G3", "g3")
.Case("G4", "g4")
.Case("G4+", "g4+")
.Case("8548", "e500")
.Case("G5", "g5")
.Case("power3", "pwr3")
.Case("power4", "pwr4")
.Case("power5", "pwr5")
.Case("power5x", "pwr5x")
.Case("power6", "pwr6")
.Case("power6x", "pwr6x")
.Case("power7", "pwr7")
.Case("power8", "pwr8")
.Case("power9", "pwr9")
.Case("power10", "pwr10")
.Case("future", "future")
.Case("powerpc", "ppc")
.Case("powerpc64", "ppc64")
.Case("powerpc64le", "ppc64le")
.Default(CPUName.data());
}
/// Get the (LLVM) name of the PowerPC cpu we are tuning for.
std::string ppc::getPPCTuneCPU(const ArgList &Args, const llvm::Triple &T) {
if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))
return normalizeCPUName(A->getValue(), T);
return getPPCGenericTargetCPU(T);
}
/// Get the (LLVM) name of the PowerPC cpu we are targeting.
std::string ppc::getPPCTargetCPU(const ArgList &Args, const llvm::Triple &T) {
if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ))
return normalizeCPUName(A->getValue(), T);
return getPPCGenericTargetCPU(T);
}
const char *ppc::getPPCAsmModeForCPU(StringRef Name) {
return llvm::StringSwitch<const char *>(Name)
.Case("pwr7", "-mpower7")
.Case("power7", "-mpower7")
.Case("pwr8", "-mpower8")
.Case("power8", "-mpower8")
.Case("ppc64le", "-mpower8")
.Case("pwr9", "-mpower9")
.Case("power9", "-mpower9")
.Case("pwr10", "-mpower10")
.Case("power10", "-mpower10")
.Default("-many");
}
void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args,
std::vector<StringRef> &Features) {
if (Triple.getSubArch() == llvm::Triple::PPCSubArch_spe)
Features.push_back("+spe");
handleTargetFeaturesGroup(Args, Features, options::OPT_m_ppc_Features_Group);
ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
if (FloatABI == ppc::FloatABI::Soft)
Features.push_back("-hard-float");
ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Triple, Args);
if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt)
Features.push_back("+secure-plt");
}
ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple,
const ArgList &Args) {
if (Args.getLastArg(options::OPT_msecure_plt))
return ppc::ReadGOTPtrMode::SecurePlt;
if ((Triple.isOSFreeBSD() && Triple.getOSMajorVersion() >= 13) ||
Triple.isOSNetBSD() || Triple.isOSOpenBSD() || Triple.isMusl())
return ppc::ReadGOTPtrMode::SecurePlt;
else
return ppc::ReadGOTPtrMode::Bss;
}
ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
ppc::FloatABI ABI = ppc::FloatABI::Invalid;
if (Arg *A =
Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
options::OPT_mfloat_abi_EQ)) {
if (A->getOption().matches(options::OPT_msoft_float))
ABI = ppc::FloatABI::Soft;
else if (A->getOption().matches(options::OPT_mhard_float))
ABI = ppc::FloatABI::Hard;
else {
ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
.Case("soft", ppc::FloatABI::Soft)
.Case("hard", ppc::FloatABI::Hard)
.Default(ppc::FloatABI::Invalid);
if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
ABI = ppc::FloatABI::Hard;
}
}
}
// If unspecified, choose the default based on the platform.
if (ABI == ppc::FloatABI::Invalid) {
ABI = ppc::FloatABI::Hard;
}
return ABI;
}
bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) {
Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
return A && (A->getValue() == StringRef(Value));
}
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