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//===--- AArch64.cpp - AArch64 (not ARM) 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 "AArch64.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/TargetParser.h"
using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;
/// \returns true if the given triple can determine the default CPU type even
/// if -arch is not specified.
static bool isCPUDeterminedByTriple(const llvm::Triple &Triple) {
return Triple.isOSDarwin();
}
/// getAArch64TargetCPU - Get the (LLVM) name of the AArch64 cpu we are
/// targeting. Set \p A to the Arg corresponding to the -mcpu argument if it is
/// provided, or to nullptr otherwise.
std::string aarch64::getAArch64TargetCPU(const ArgList &Args,
const llvm::Triple &Triple, Arg *&A) {
std::string CPU;
// If we have -mcpu, use that.
if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) {
StringRef Mcpu = A->getValue();
CPU = Mcpu.split("+").first.lower();
}
// Handle CPU name is 'native'.
if (CPU == "native")
return llvm::sys::getHostCPUName();
else if (CPU.size())
return CPU;
// Make sure we pick "cyclone" if -arch is used or when targetting a Darwin
// OS.
if (Args.getLastArg(options::OPT_arch) || Triple.isOSDarwin())
return "cyclone";
return "generic";
}
// Decode AArch64 features from string like +[no]featureA+[no]featureB+...
static bool DecodeAArch64Features(const Driver &D, StringRef text,
std::vector<StringRef> &Features) {
SmallVector<StringRef, 8> Split;
text.split(Split, StringRef("+"), -1, false);
for (StringRef Feature : Split) {
StringRef FeatureName = llvm::AArch64::getArchExtFeature(Feature);
if (!FeatureName.empty())
Features.push_back(FeatureName);
else if (Feature == "neon" || Feature == "noneon")
D.Diag(clang::diag::err_drv_no_neon_modifier);
else
return false;
}
return true;
}
// Check if the CPU name and feature modifiers in -mcpu are legal. If yes,
// decode CPU and feature.
static bool DecodeAArch64Mcpu(const Driver &D, StringRef Mcpu, StringRef &CPU,
std::vector<StringRef> &Features) {
std::pair<StringRef, StringRef> Split = Mcpu.split("+");
CPU = Split.first;
if (CPU == "native")
CPU = llvm::sys::getHostCPUName();
if (CPU == "generic") {
Features.push_back("+neon");
} else {
llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseCPUArch(CPU);
if (!llvm::AArch64::getArchFeatures(ArchKind, Features))
return false;
unsigned Extension = llvm::AArch64::getDefaultExtensions(CPU, ArchKind);
if (!llvm::AArch64::getExtensionFeatures(Extension, Features))
return false;
}
if (Split.second.size() && !DecodeAArch64Features(D, Split.second, Features))
return false;
return true;
}
static bool
getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
const ArgList &Args,
std::vector<StringRef> &Features) {
std::string MarchLowerCase = March.lower();
std::pair<StringRef, StringRef> Split = StringRef(MarchLowerCase).split("+");
llvm::AArch64::ArchKind ArchKind = llvm::AArch64::parseArch(Split.first);
if (ArchKind == llvm::AArch64::ArchKind::INVALID ||
!llvm::AArch64::getArchFeatures(ArchKind, Features) ||
(Split.second.size() && !DecodeAArch64Features(D, Split.second, Features)))
return false;
return true;
}
static bool
getAArch64ArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
const ArgList &Args,
std::vector<StringRef> &Features) {
StringRef CPU;
std::string McpuLowerCase = Mcpu.lower();
if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, Features))
return false;
return true;
}
static bool
getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
const ArgList &Args,
std::vector<StringRef> &Features) {
std::string MtuneLowerCase = Mtune.lower();
// Check CPU name is valid
std::vector<StringRef> MtuneFeatures;
StringRef Tune;
if (!DecodeAArch64Mcpu(D, MtuneLowerCase, Tune, MtuneFeatures))
return false;
// Handle CPU name is 'native'.
if (MtuneLowerCase == "native")
MtuneLowerCase = llvm::sys::getHostCPUName();
if (MtuneLowerCase == "cyclone") {
Features.push_back("+zcm");
Features.push_back("+zcz");
}
return true;
}
static bool
getAArch64MicroArchFeaturesFromMcpu(const Driver &D, StringRef Mcpu,
const ArgList &Args,
std::vector<StringRef> &Features) {
StringRef CPU;
std::vector<StringRef> DecodedFeature;
std::string McpuLowerCase = Mcpu.lower();
if (!DecodeAArch64Mcpu(D, McpuLowerCase, CPU, DecodedFeature))
return false;
return getAArch64MicroArchFeaturesFromMtune(D, CPU, Args, Features);
}
void aarch64::getAArch64TargetFeatures(const Driver &D,
const llvm::Triple &Triple,
const ArgList &Args,
std::vector<StringRef> &Features) {
Arg *A;
bool success = true;
// Enable NEON by default.
Features.push_back("+neon");
if ((A = Args.getLastArg(options::OPT_march_EQ)))
success = getAArch64ArchFeaturesFromMarch(D, A->getValue(), Args, Features);
else if ((A = Args.getLastArg(options::OPT_mcpu_EQ)))
success = getAArch64ArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
else if (Args.hasArg(options::OPT_arch) || isCPUDeterminedByTriple(Triple))
success = getAArch64ArchFeaturesFromMcpu(
D, getAArch64TargetCPU(Args, Triple, A), Args, Features);
if (success && (A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)))
success =
getAArch64MicroArchFeaturesFromMtune(D, A->getValue(), Args, Features);
else if (success && (A = Args.getLastArg(options::OPT_mcpu_EQ)))
success =
getAArch64MicroArchFeaturesFromMcpu(D, A->getValue(), Args, Features);
else if (success &&
(Args.hasArg(options::OPT_arch) || isCPUDeterminedByTriple(Triple)))
success = getAArch64MicroArchFeaturesFromMcpu(
D, getAArch64TargetCPU(Args, Triple, A), Args, Features);
if (!success)
D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
if (Args.getLastArg(options::OPT_mgeneral_regs_only)) {
Features.push_back("-fp-armv8");
Features.push_back("-crypto");
Features.push_back("-neon");
}
if (Arg *A = Args.getLastArg(options::OPT_mtp_mode_EQ)) {
StringRef Mtp = A->getValue();
if (Mtp == "el3")
Features.push_back("+tpidr-el3");
else if (Mtp == "el2")
Features.push_back("+tpidr-el2");
else if (Mtp == "el1")
Features.push_back("+tpidr-el1");
else if (Mtp != "el0")
D.Diag(diag::err_drv_invalid_mtp) << A->getAsString(Args);
}
// En/disable crc
if (Arg *A = Args.getLastArg(options::OPT_mcrc, options::OPT_mnocrc)) {
if (A->getOption().matches(options::OPT_mcrc))
Features.push_back("+crc");
else
Features.push_back("-crc");
}
// Handle (arch-dependent) fp16fml/fullfp16 relationship.
// FIXME: this fp16fml option handling will be reimplemented after the
// TargetParser rewrite.
const auto ItRNoFullFP16 = std::find(Features.rbegin(), Features.rend(), "-fullfp16");
const auto ItRFP16FML = std::find(Features.rbegin(), Features.rend(), "+fp16fml");
if (llvm::is_contained(Features, "+v8.4a")) {
const auto ItRFullFP16 = std::find(Features.rbegin(), Features.rend(), "+fullfp16");
if (ItRFullFP16 < ItRNoFullFP16 && ItRFullFP16 < ItRFP16FML) {
// Only entangled feature that can be to the right of this +fullfp16 is -fp16fml.
// Only append the +fp16fml if there is no -fp16fml after the +fullfp16.
if (std::find(Features.rbegin(), ItRFullFP16, "-fp16fml") == ItRFullFP16)
Features.push_back("+fp16fml");
}
else
goto fp16_fml_fallthrough;
} else {
fp16_fml_fallthrough:
// In both of these cases, putting the 'other' feature on the end of the vector will
// result in the same effect as placing it immediately after the current feature.
if (ItRNoFullFP16 < ItRFP16FML)
Features.push_back("-fp16fml");
else if (ItRNoFullFP16 > ItRFP16FML)
Features.push_back("+fullfp16");
}
// FIXME: this needs reimplementation too after the TargetParser rewrite
//
// Context sensitive meaning of Crypto:
// 1) For Arch >= ARMv8.4a: crypto = sm4 + sha3 + sha2 + aes
// 2) For Arch <= ARMv8.3a: crypto = sha2 + aes
const auto ItBegin = Features.begin();
const auto ItEnd = Features.end();
const auto ItRBegin = Features.rbegin();
const auto ItREnd = Features.rend();
const auto ItRCrypto = std::find(ItRBegin, ItREnd, "+crypto");
const auto ItRNoCrypto = std::find(ItRBegin, ItREnd, "-crypto");
const auto HasCrypto = ItRCrypto != ItREnd;
const auto HasNoCrypto = ItRNoCrypto != ItREnd;
const ptrdiff_t PosCrypto = ItRCrypto - ItRBegin;
const ptrdiff_t PosNoCrypto = ItRNoCrypto - ItRBegin;
bool NoCrypto = false;
if (HasCrypto && HasNoCrypto) {
if (PosNoCrypto < PosCrypto)
NoCrypto = true;
}
if (std::find(ItBegin, ItEnd, "+v8.4a") != ItEnd) {
if (HasCrypto && !NoCrypto) {
// Check if we have NOT disabled an algorithm with something like:
// +crypto, -algorithm
// And if "-algorithm" does not occur, we enable that crypto algorithm.
const bool HasSM4 = (std::find(ItBegin, ItEnd, "-sm4") == ItEnd);
const bool HasSHA3 = (std::find(ItBegin, ItEnd, "-sha3") == ItEnd);
const bool HasSHA2 = (std::find(ItBegin, ItEnd, "-sha2") == ItEnd);
const bool HasAES = (std::find(ItBegin, ItEnd, "-aes") == ItEnd);
if (HasSM4)
Features.push_back("+sm4");
if (HasSHA3)
Features.push_back("+sha3");
if (HasSHA2)
Features.push_back("+sha2");
if (HasAES)
Features.push_back("+aes");
} else if (HasNoCrypto) {
// Check if we have NOT enabled a crypto algorithm with something like:
// -crypto, +algorithm
// And if "+algorithm" does not occur, we disable that crypto algorithm.
const bool HasSM4 = (std::find(ItBegin, ItEnd, "+sm4") != ItEnd);
const bool HasSHA3 = (std::find(ItBegin, ItEnd, "+sha3") != ItEnd);
const bool HasSHA2 = (std::find(ItBegin, ItEnd, "+sha2") != ItEnd);
const bool HasAES = (std::find(ItBegin, ItEnd, "+aes") != ItEnd);
if (!HasSM4)
Features.push_back("-sm4");
if (!HasSHA3)
Features.push_back("-sha3");
if (!HasSHA2)
Features.push_back("-sha2");
if (!HasAES)
Features.push_back("-aes");
}
} else {
if (HasCrypto && !NoCrypto) {
const bool HasSHA2 = (std::find(ItBegin, ItEnd, "-sha2") == ItEnd);
const bool HasAES = (std::find(ItBegin, ItEnd, "-aes") == ItEnd);
if (HasSHA2)
Features.push_back("+sha2");
if (HasAES)
Features.push_back("+aes");
} else if (HasNoCrypto) {
const bool HasSHA2 = (std::find(ItBegin, ItEnd, "+sha2") != ItEnd);
const bool HasAES = (std::find(ItBegin, ItEnd, "+aes") != ItEnd);
const bool HasV82a = (std::find(ItBegin, ItEnd, "+v8.2a") != ItEnd);
const bool HasV83a = (std::find(ItBegin, ItEnd, "+v8.3a") != ItEnd);
const bool HasV84a = (std::find(ItBegin, ItEnd, "+v8.4a") != ItEnd);
if (!HasSHA2)
Features.push_back("-sha2");
if (!HasAES)
Features.push_back("-aes");
if (HasV82a || HasV83a || HasV84a) {
Features.push_back("-sm4");
Features.push_back("-sha3");
}
}
}
if (Arg *A = Args.getLastArg(options::OPT_mno_unaligned_access,
options::OPT_munaligned_access))
if (A->getOption().matches(options::OPT_mno_unaligned_access))
Features.push_back("+strict-align");
if (Args.hasArg(options::OPT_ffixed_x1))
Features.push_back("+reserve-x1");
if (Args.hasArg(options::OPT_ffixed_x2))
Features.push_back("+reserve-x2");
if (Args.hasArg(options::OPT_ffixed_x3))
Features.push_back("+reserve-x3");
if (Args.hasArg(options::OPT_ffixed_x4))
Features.push_back("+reserve-x4");
if (Args.hasArg(options::OPT_ffixed_x5))
Features.push_back("+reserve-x5");
if (Args.hasArg(options::OPT_ffixed_x6))
Features.push_back("+reserve-x6");
if (Args.hasArg(options::OPT_ffixed_x7))
Features.push_back("+reserve-x7");
if (Args.hasArg(options::OPT_ffixed_x9))
Features.push_back("+reserve-x9");
if (Args.hasArg(options::OPT_ffixed_x10))
Features.push_back("+reserve-x10");
if (Args.hasArg(options::OPT_ffixed_x11))
Features.push_back("+reserve-x11");
if (Args.hasArg(options::OPT_ffixed_x12))
Features.push_back("+reserve-x12");
if (Args.hasArg(options::OPT_ffixed_x13))
Features.push_back("+reserve-x13");
if (Args.hasArg(options::OPT_ffixed_x14))
Features.push_back("+reserve-x14");
if (Args.hasArg(options::OPT_ffixed_x15))
Features.push_back("+reserve-x15");
if (Args.hasArg(options::OPT_ffixed_x18))
Features.push_back("+reserve-x18");
if (Args.hasArg(options::OPT_ffixed_x20))
Features.push_back("+reserve-x20");
if (Args.hasArg(options::OPT_ffixed_x21))
Features.push_back("+reserve-x21");
if (Args.hasArg(options::OPT_ffixed_x22))
Features.push_back("+reserve-x22");
if (Args.hasArg(options::OPT_ffixed_x23))
Features.push_back("+reserve-x23");
if (Args.hasArg(options::OPT_ffixed_x24))
Features.push_back("+reserve-x24");
if (Args.hasArg(options::OPT_ffixed_x25))
Features.push_back("+reserve-x25");
if (Args.hasArg(options::OPT_ffixed_x26))
Features.push_back("+reserve-x26");
if (Args.hasArg(options::OPT_ffixed_x27))
Features.push_back("+reserve-x27");
if (Args.hasArg(options::OPT_ffixed_x28))
Features.push_back("+reserve-x28");
if (Args.hasArg(options::OPT_fcall_saved_x8))
Features.push_back("+call-saved-x8");
if (Args.hasArg(options::OPT_fcall_saved_x9))
Features.push_back("+call-saved-x9");
if (Args.hasArg(options::OPT_fcall_saved_x10))
Features.push_back("+call-saved-x10");
if (Args.hasArg(options::OPT_fcall_saved_x11))
Features.push_back("+call-saved-x11");
if (Args.hasArg(options::OPT_fcall_saved_x12))
Features.push_back("+call-saved-x12");
if (Args.hasArg(options::OPT_fcall_saved_x13))
Features.push_back("+call-saved-x13");
if (Args.hasArg(options::OPT_fcall_saved_x14))
Features.push_back("+call-saved-x14");
if (Args.hasArg(options::OPT_fcall_saved_x15))
Features.push_back("+call-saved-x15");
if (Args.hasArg(options::OPT_fcall_saved_x18))
Features.push_back("+call-saved-x18");
if (Args.hasArg(options::OPT_mno_neg_immediates))
Features.push_back("+no-neg-immediates");
}
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