169 lines
5.8 KiB
C++
169 lines
5.8 KiB
C++
//===--- PPC.cpp - PPC Helpers for Tools ------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "PPC.h"
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#include "ToolChains/CommonArgs.h"
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#include "clang/Driver/Driver.h"
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#include "clang/Driver/DriverDiagnostic.h"
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#include "clang/Driver/Options.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/Option/ArgList.h"
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#include "llvm/TargetParser/Host.h"
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using namespace clang::driver;
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using namespace clang::driver::tools;
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using namespace clang;
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using namespace llvm::opt;
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static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
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// LLVM may default to generating code for the native CPU,
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// but, like gcc, we default to a more generic option for
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// each architecture. (except on AIX)
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if (T.isOSAIX())
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return "pwr7";
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else if (T.getArch() == llvm::Triple::ppc64le)
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return "ppc64le";
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else if (T.getArch() == llvm::Triple::ppc64)
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return "ppc64";
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else
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return "ppc";
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}
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static std::string normalizeCPUName(StringRef CPUName, const llvm::Triple &T) {
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// Clang/LLVM does not actually support code generation
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// for the 405 CPU. However, there are uses of this CPU ID
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// in projects that previously used GCC and rely on Clang
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// accepting it. Clang has always ignored it and passed the
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// generic CPU ID to the back end.
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if (CPUName == "generic" || CPUName == "405")
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return getPPCGenericTargetCPU(T);
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if (CPUName == "native") {
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std::string CPU = std::string(llvm::sys::getHostCPUName());
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if (!CPU.empty() && CPU != "generic")
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return CPU;
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else
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return getPPCGenericTargetCPU(T);
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}
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return llvm::StringSwitch<const char *>(CPUName)
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.Case("common", "generic")
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.Case("440fp", "440")
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.Case("630", "pwr3")
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.Case("G3", "g3")
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.Case("G4", "g4")
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.Case("G4+", "g4+")
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.Case("8548", "e500")
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.Case("G5", "g5")
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.Case("power3", "pwr3")
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.Case("power4", "pwr4")
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.Case("power5", "pwr5")
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.Case("power5x", "pwr5x")
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.Case("power6", "pwr6")
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.Case("power6x", "pwr6x")
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.Case("power7", "pwr7")
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.Case("power8", "pwr8")
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.Case("power9", "pwr9")
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.Case("power10", "pwr10")
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.Case("future", "future")
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.Case("powerpc", "ppc")
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.Case("powerpc64", "ppc64")
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.Case("powerpc64le", "ppc64le")
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.Default(CPUName.data());
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}
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/// Get the (LLVM) name of the PowerPC cpu we are tuning for.
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std::string ppc::getPPCTuneCPU(const ArgList &Args, const llvm::Triple &T) {
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if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ))
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return normalizeCPUName(A->getValue(), T);
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return getPPCGenericTargetCPU(T);
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}
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/// Get the (LLVM) name of the PowerPC cpu we are targeting.
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std::string ppc::getPPCTargetCPU(const Driver &D, const ArgList &Args,
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const llvm::Triple &T) {
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if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ))
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return normalizeCPUName(A->getValue(), T);
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return getPPCGenericTargetCPU(T);
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}
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const char *ppc::getPPCAsmModeForCPU(StringRef Name) {
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return llvm::StringSwitch<const char *>(Name)
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.Case("pwr7", "-mpower7")
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.Case("power7", "-mpower7")
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.Case("pwr8", "-mpower8")
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.Case("power8", "-mpower8")
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.Case("ppc64le", "-mpower8")
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.Case("pwr9", "-mpower9")
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.Case("power9", "-mpower9")
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.Case("pwr10", "-mpower10")
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.Case("power10", "-mpower10")
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.Default("-many");
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}
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void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple,
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const ArgList &Args,
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std::vector<StringRef> &Features) {
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if (Triple.getSubArch() == llvm::Triple::PPCSubArch_spe)
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Features.push_back("+spe");
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handleTargetFeaturesGroup(D, Triple, Args, Features,
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options::OPT_m_ppc_Features_Group);
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ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args);
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if (FloatABI == ppc::FloatABI::Soft)
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Features.push_back("-hard-float");
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ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Triple, Args);
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if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt)
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Features.push_back("+secure-plt");
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}
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ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple,
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const ArgList &Args) {
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if (Args.getLastArg(options::OPT_msecure_plt))
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return ppc::ReadGOTPtrMode::SecurePlt;
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if (Triple.isPPC32SecurePlt())
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return ppc::ReadGOTPtrMode::SecurePlt;
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else
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return ppc::ReadGOTPtrMode::Bss;
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}
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ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) {
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ppc::FloatABI ABI = ppc::FloatABI::Invalid;
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if (Arg *A =
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Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
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options::OPT_mfloat_abi_EQ)) {
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if (A->getOption().matches(options::OPT_msoft_float))
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ABI = ppc::FloatABI::Soft;
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else if (A->getOption().matches(options::OPT_mhard_float))
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ABI = ppc::FloatABI::Hard;
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else {
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ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue())
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.Case("soft", ppc::FloatABI::Soft)
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.Case("hard", ppc::FloatABI::Hard)
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.Default(ppc::FloatABI::Invalid);
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if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
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D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
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ABI = ppc::FloatABI::Hard;
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}
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}
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}
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// If unspecified, choose the default based on the platform.
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if (ABI == ppc::FloatABI::Invalid) {
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ABI = ppc::FloatABI::Hard;
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}
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return ABI;
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}
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bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) {
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Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
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return A && (A->getValue() == StringRef(Value));
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}
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