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llvm-mirror/lib/Support/ARMTargetParser.cpp
David Candler ae86f98e7c [ARM][AArch64] Require appropriate features for crypto algorithms 
This patch changes the AArch32 crypto instructions (sha2 and aes) to
require the specific sha2 or aes features. These features have
already been implemented and can be controlled through the command
line, but do not have the expected result (i.e. `+noaes` will not
disable aes instructions). The crypto feature retains its existing
meaning of both sha2 and aes.

Several small changes are included due to the knock-on effect this has:

- The AArch32 driver has been modified to ensure sha2/aes is correctly
  set based on arch/cpu/fpu selection and feature ordering.
- Crypto extensions are permitted for AArch32 v8-R profile, but not
  enabled by default.
- ACLE feature macros have been updated with the fine grained crypto
  algorithms. These are also used by AArch64.
- Various tests updated due to the change in feature lists and macros.

Reviewed By: lenary

Differential Revision: https://reviews.llvm.org/D99079
2021-04-28 16:26:18 +01:00

633 lines
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//===-- ARMTargetParser - Parser for ARM target features --------*- 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a target parser to recognise ARM hardware features
// such as FPU/CPU/ARCH/extensions and specific support such as HWDIV.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/ARMTargetParser.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/Triple.h"
#include <cctype>
using namespace llvm;
static StringRef getHWDivSynonym(StringRef HWDiv) {
return StringSwitch<StringRef>(HWDiv)
.Case("thumb,arm", "arm,thumb")
.Default(HWDiv);
}
// Allows partial match, ex. "v7a" matches "armv7a".
ARM::ArchKind ARM::parseArch(StringRef Arch) {
Arch = getCanonicalArchName(Arch);
StringRef Syn = getArchSynonym(Arch);
for (const auto &A : ARCHNames) {
if (A.getName().endswith(Syn))
return A.ID;
}
return ArchKind::INVALID;
}
// Version number (ex. v7 = 7).
unsigned ARM::parseArchVersion(StringRef Arch) {
Arch = getCanonicalArchName(Arch);
switch (parseArch(Arch)) {
case ArchKind::ARMV2:
case ArchKind::ARMV2A:
return 2;
case ArchKind::ARMV3:
case ArchKind::ARMV3M:
return 3;
case ArchKind::ARMV4:
case ArchKind::ARMV4T:
return 4;
case ArchKind::ARMV5T:
case ArchKind::ARMV5TE:
case ArchKind::IWMMXT:
case ArchKind::IWMMXT2:
case ArchKind::XSCALE:
case ArchKind::ARMV5TEJ:
return 5;
case ArchKind::ARMV6:
case ArchKind::ARMV6K:
case ArchKind::ARMV6T2:
case ArchKind::ARMV6KZ:
case ArchKind::ARMV6M:
return 6;
case ArchKind::ARMV7A:
case ArchKind::ARMV7VE:
case ArchKind::ARMV7R:
case ArchKind::ARMV7M:
case ArchKind::ARMV7S:
case ArchKind::ARMV7EM:
case ArchKind::ARMV7K:
return 7;
case ArchKind::ARMV8A:
case ArchKind::ARMV8_1A:
case ArchKind::ARMV8_2A:
case ArchKind::ARMV8_3A:
case ArchKind::ARMV8_4A:
case ArchKind::ARMV8_5A:
case ArchKind::ARMV8_6A:
case ArchKind::ARMV8_7A:
case ArchKind::ARMV8R:
case ArchKind::ARMV8MBaseline:
case ArchKind::ARMV8MMainline:
case ArchKind::ARMV8_1MMainline:
return 8;
case ArchKind::INVALID:
return 0;
}
llvm_unreachable("Unhandled architecture");
}
// Profile A/R/M
ARM::ProfileKind ARM::parseArchProfile(StringRef Arch) {
Arch = getCanonicalArchName(Arch);
switch (parseArch(Arch)) {
case ArchKind::ARMV6M:
case ArchKind::ARMV7M:
case ArchKind::ARMV7EM:
case ArchKind::ARMV8MMainline:
case ArchKind::ARMV8MBaseline:
case ArchKind::ARMV8_1MMainline:
return ProfileKind::M;
case ArchKind::ARMV7R:
case ArchKind::ARMV8R:
return ProfileKind::R;
case ArchKind::ARMV7A:
case ArchKind::ARMV7VE:
case ArchKind::ARMV7K:
case ArchKind::ARMV8A:
case ArchKind::ARMV8_1A:
case ArchKind::ARMV8_2A:
case ArchKind::ARMV8_3A:
case ArchKind::ARMV8_4A:
case ArchKind::ARMV8_5A:
case ArchKind::ARMV8_6A:
case ArchKind::ARMV8_7A:
return ProfileKind::A;
case ArchKind::ARMV2:
case ArchKind::ARMV2A:
case ArchKind::ARMV3:
case ArchKind::ARMV3M:
case ArchKind::ARMV4:
case ArchKind::ARMV4T:
case ArchKind::ARMV5T:
case ArchKind::ARMV5TE:
case ArchKind::ARMV5TEJ:
case ArchKind::ARMV6:
case ArchKind::ARMV6K:
case ArchKind::ARMV6T2:
case ArchKind::ARMV6KZ:
case ArchKind::ARMV7S:
case ArchKind::IWMMXT:
case ArchKind::IWMMXT2:
case ArchKind::XSCALE:
case ArchKind::INVALID:
return ProfileKind::INVALID;
}
llvm_unreachable("Unhandled architecture");
}
StringRef ARM::getArchSynonym(StringRef Arch) {
return StringSwitch<StringRef>(Arch)
.Case("v5", "v5t")
.Case("v5e", "v5te")
.Case("v6j", "v6")
.Case("v6hl", "v6k")
.Cases("v6m", "v6sm", "v6s-m", "v6-m")
.Cases("v6z", "v6zk", "v6kz")
.Cases("v7", "v7a", "v7hl", "v7l", "v7-a")
.Case("v7r", "v7-r")
.Case("v7m", "v7-m")
.Case("v7em", "v7e-m")
.Cases("v8", "v8a", "v8l", "aarch64", "arm64", "v8-a")
.Case("v8.1a", "v8.1-a")
.Case("v8.2a", "v8.2-a")
.Case("v8.3a", "v8.3-a")
.Case("v8.4a", "v8.4-a")
.Case("v8.5a", "v8.5-a")
.Case("v8.6a", "v8.6-a")
.Case("v8.7a", "v8.7-a")
.Case("v8r", "v8-r")
.Case("v8m.base", "v8-m.base")
.Case("v8m.main", "v8-m.main")
.Case("v8.1m.main", "v8.1-m.main")
.Default(Arch);
}
bool ARM::getFPUFeatures(unsigned FPUKind, std::vector<StringRef> &Features) {
if (FPUKind >= FK_LAST || FPUKind == FK_INVALID)
return false;
static const struct FPUFeatureNameInfo {
const char *PlusName, *MinusName;
FPUVersion MinVersion;
FPURestriction MaxRestriction;
} FPUFeatureInfoList[] = {
// We have to specify the + and - versions of the name in full so
// that we can return them as static StringRefs.
//
// Also, the SubtargetFeatures ending in just "sp" are listed here
// under FPURestriction::None, which is the only FPURestriction in
// which they would be valid (since FPURestriction::SP doesn't
// exist).
{"+vfp2", "-vfp2", FPUVersion::VFPV2, FPURestriction::D16},
{"+vfp2sp", "-vfp2sp", FPUVersion::VFPV2, FPURestriction::SP_D16},
{"+vfp3", "-vfp3", FPUVersion::VFPV3, FPURestriction::None},
{"+vfp3d16", "-vfp3d16", FPUVersion::VFPV3, FPURestriction::D16},
{"+vfp3d16sp", "-vfp3d16sp", FPUVersion::VFPV3, FPURestriction::SP_D16},
{"+vfp3sp", "-vfp3sp", FPUVersion::VFPV3, FPURestriction::None},
{"+fp16", "-fp16", FPUVersion::VFPV3_FP16, FPURestriction::SP_D16},
{"+vfp4", "-vfp4", FPUVersion::VFPV4, FPURestriction::None},
{"+vfp4d16", "-vfp4d16", FPUVersion::VFPV4, FPURestriction::D16},
{"+vfp4d16sp", "-vfp4d16sp", FPUVersion::VFPV4, FPURestriction::SP_D16},
{"+vfp4sp", "-vfp4sp", FPUVersion::VFPV4, FPURestriction::None},
{"+fp-armv8", "-fp-armv8", FPUVersion::VFPV5, FPURestriction::None},
{"+fp-armv8d16", "-fp-armv8d16", FPUVersion::VFPV5, FPURestriction::D16},
{"+fp-armv8d16sp", "-fp-armv8d16sp", FPUVersion::VFPV5, FPURestriction::SP_D16},
{"+fp-armv8sp", "-fp-armv8sp", FPUVersion::VFPV5, FPURestriction::None},
{"+fullfp16", "-fullfp16", FPUVersion::VFPV5_FULLFP16, FPURestriction::SP_D16},
{"+fp64", "-fp64", FPUVersion::VFPV2, FPURestriction::D16},
{"+d32", "-d32", FPUVersion::VFPV3, FPURestriction::None},
};
for (const auto &Info: FPUFeatureInfoList) {
if (FPUNames[FPUKind].FPUVer >= Info.MinVersion &&
FPUNames[FPUKind].Restriction <= Info.MaxRestriction)
Features.push_back(Info.PlusName);
else
Features.push_back(Info.MinusName);
}
static const struct NeonFeatureNameInfo {
const char *PlusName, *MinusName;
NeonSupportLevel MinSupportLevel;
} NeonFeatureInfoList[] = {
{"+neon", "-neon", NeonSupportLevel::Neon},
{"+sha2", "-sha2", NeonSupportLevel::Crypto},
{"+aes", "-aes", NeonSupportLevel::Crypto},
};
for (const auto &Info: NeonFeatureInfoList) {
if (FPUNames[FPUKind].NeonSupport >= Info.MinSupportLevel)
Features.push_back(Info.PlusName);
else
Features.push_back(Info.MinusName);
}
return true;
}
// Little/Big endian
ARM::EndianKind ARM::parseArchEndian(StringRef Arch) {
if (Arch.startswith("armeb") || Arch.startswith("thumbeb") ||
Arch.startswith("aarch64_be"))
return EndianKind::BIG;
if (Arch.startswith("arm") || Arch.startswith("thumb")) {
if (Arch.endswith("eb"))
return EndianKind::BIG;
else
return EndianKind::LITTLE;
}
if (Arch.startswith("aarch64") || Arch.startswith("aarch64_32"))
return EndianKind::LITTLE;
return EndianKind::INVALID;
}
// ARM, Thumb, AArch64
ARM::ISAKind ARM::parseArchISA(StringRef Arch) {
return StringSwitch<ISAKind>(Arch)
.StartsWith("aarch64", ISAKind::AARCH64)
.StartsWith("arm64", ISAKind::AARCH64)
.StartsWith("thumb", ISAKind::THUMB)
.StartsWith("arm", ISAKind::ARM)
.Default(ISAKind::INVALID);
}
unsigned ARM::parseFPU(StringRef FPU) {
StringRef Syn = getFPUSynonym(FPU);
for (const auto &F : FPUNames) {
if (Syn == F.getName())
return F.ID;
}
return FK_INVALID;
}
ARM::NeonSupportLevel ARM::getFPUNeonSupportLevel(unsigned FPUKind) {
if (FPUKind >= FK_LAST)
return NeonSupportLevel::None;
return FPUNames[FPUKind].NeonSupport;
}
// MArch is expected to be of the form (arm|thumb)?(eb)?(v.+)?(eb)?, but
// (iwmmxt|xscale)(eb)? is also permitted. If the former, return
// "v.+", if the latter, return unmodified string, minus 'eb'.
// If invalid, return empty string.
StringRef ARM::getCanonicalArchName(StringRef Arch) {
size_t offset = StringRef::npos;
StringRef A = Arch;
StringRef Error = "";
// Begins with "arm" / "thumb", move past it.
if (A.startswith("arm64_32"))
offset = 8;
else if (A.startswith("arm64e"))
offset = 6;
else if (A.startswith("arm64"))
offset = 5;
else if (A.startswith("aarch64_32"))
offset = 10;
else if (A.startswith("arm"))
offset = 3;
else if (A.startswith("thumb"))
offset = 5;
else if (A.startswith("aarch64")) {
offset = 7;
// AArch64 uses "_be", not "eb" suffix.
if (A.find("eb") != StringRef::npos)
return Error;
if (A.substr(offset, 3) == "_be")
offset += 3;
}
// Ex. "armebv7", move past the "eb".
if (offset != StringRef::npos && A.substr(offset, 2) == "eb")
offset += 2;
// Or, if it ends with eb ("armv7eb"), chop it off.
else if (A.endswith("eb"))
A = A.substr(0, A.size() - 2);
// Trim the head
if (offset != StringRef::npos)
A = A.substr(offset);
// Empty string means offset reached the end, which means it's valid.
if (A.empty())
return Arch;
// Only match non-marketing names
if (offset != StringRef::npos) {
// Must start with 'vN'.
if (A.size() >= 2 && (A[0] != 'v' || !std::isdigit(A[1])))
return Error;
// Can't have an extra 'eb'.
if (A.find("eb") != StringRef::npos)
return Error;
}
// Arch will either be a 'v' name (v7a) or a marketing name (xscale).
return A;
}
StringRef ARM::getFPUSynonym(StringRef FPU) {
return StringSwitch<StringRef>(FPU)
.Cases("fpa", "fpe2", "fpe3", "maverick", "invalid") // Unsupported
.Case("vfp2", "vfpv2")
.Case("vfp3", "vfpv3")
.Case("vfp4", "vfpv4")
.Case("vfp3-d16", "vfpv3-d16")
.Case("vfp4-d16", "vfpv4-d16")
.Cases("fp4-sp-d16", "vfpv4-sp-d16", "fpv4-sp-d16")
.Cases("fp4-dp-d16", "fpv4-dp-d16", "vfpv4-d16")
.Case("fp5-sp-d16", "fpv5-sp-d16")
.Cases("fp5-dp-d16", "fpv5-dp-d16", "fpv5-d16")
// FIXME: Clang uses it, but it's bogus, since neon defaults to vfpv3.
.Case("neon-vfpv3", "neon")
.Default(FPU);
}
StringRef ARM::getFPUName(unsigned FPUKind) {
if (FPUKind >= FK_LAST)
return StringRef();
return FPUNames[FPUKind].getName();
}
ARM::FPUVersion ARM::getFPUVersion(unsigned FPUKind) {
if (FPUKind >= FK_LAST)
return FPUVersion::NONE;
return FPUNames[FPUKind].FPUVer;
}
ARM::FPURestriction ARM::getFPURestriction(unsigned FPUKind) {
if (FPUKind >= FK_LAST)
return FPURestriction::None;
return FPUNames[FPUKind].Restriction;
}
unsigned ARM::getDefaultFPU(StringRef CPU, ARM::ArchKind AK) {
if (CPU == "generic")
return ARM::ARCHNames[static_cast<unsigned>(AK)].DefaultFPU;
return StringSwitch<unsigned>(CPU)
#define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT) \
.Case(NAME, DEFAULT_FPU)
#include "llvm/Support/ARMTargetParser.def"
.Default(ARM::FK_INVALID);
}
uint64_t ARM::getDefaultExtensions(StringRef CPU, ARM::ArchKind AK) {
if (CPU == "generic")
return ARM::ARCHNames[static_cast<unsigned>(AK)].ArchBaseExtensions;
return StringSwitch<uint64_t>(CPU)
#define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT) \
.Case(NAME, \
ARCHNames[static_cast<unsigned>(ArchKind::ID)].ArchBaseExtensions | \
DEFAULT_EXT)
#include "llvm/Support/ARMTargetParser.def"
.Default(ARM::AEK_INVALID);
}
bool ARM::getHWDivFeatures(uint64_t HWDivKind,
std::vector<StringRef> &Features) {
if (HWDivKind == AEK_INVALID)
return false;
if (HWDivKind & AEK_HWDIVARM)
Features.push_back("+hwdiv-arm");
else
Features.push_back("-hwdiv-arm");
if (HWDivKind & AEK_HWDIVTHUMB)
Features.push_back("+hwdiv");
else
Features.push_back("-hwdiv");
return true;
}
bool ARM::getExtensionFeatures(uint64_t Extensions,
std::vector<StringRef> &Features) {
if (Extensions == AEK_INVALID)
return false;
for (const auto &AE : ARCHExtNames) {
if ((Extensions & AE.ID) == AE.ID && AE.Feature)
Features.push_back(AE.Feature);
else if (AE.NegFeature)
Features.push_back(AE.NegFeature);
}
return getHWDivFeatures(Extensions, Features);
}
StringRef ARM::getArchName(ARM::ArchKind AK) {
return ARCHNames[static_cast<unsigned>(AK)].getName();
}
StringRef ARM::getCPUAttr(ARM::ArchKind AK) {
return ARCHNames[static_cast<unsigned>(AK)].getCPUAttr();
}
StringRef ARM::getSubArch(ARM::ArchKind AK) {
return ARCHNames[static_cast<unsigned>(AK)].getSubArch();
}
unsigned ARM::getArchAttr(ARM::ArchKind AK) {
return ARCHNames[static_cast<unsigned>(AK)].ArchAttr;
}
StringRef ARM::getArchExtName(uint64_t ArchExtKind) {
for (const auto &AE : ARCHExtNames) {
if (ArchExtKind == AE.ID)
return AE.getName();
}
return StringRef();
}
static bool stripNegationPrefix(StringRef &Name) {
if (Name.startswith("no")) {
Name = Name.substr(2);
return true;
}
return false;
}
StringRef ARM::getArchExtFeature(StringRef ArchExt) {
bool Negated = stripNegationPrefix(ArchExt);
for (const auto &AE : ARCHExtNames) {
if (AE.Feature && ArchExt == AE.getName())
return StringRef(Negated ? AE.NegFeature : AE.Feature);
}
return StringRef();
}
static unsigned findDoublePrecisionFPU(unsigned InputFPUKind) {
const ARM::FPUName &InputFPU = ARM::FPUNames[InputFPUKind];
// If the input FPU already supports double-precision, then there
// isn't any different FPU we can return here.
//
// The current available FPURestriction values are None (no
// restriction), D16 (only 16 d-regs) and SP_D16 (16 d-regs
// and single precision only); there's no value representing
// SP restriction without D16. So this test just means 'is it
// SP only?'.
if (InputFPU.Restriction != ARM::FPURestriction::SP_D16)
return ARM::FK_INVALID;
// Otherwise, look for an FPU entry with all the same fields, except
// that SP_D16 has been replaced with just D16, representing adding
// double precision and not changing anything else.
for (const ARM::FPUName &CandidateFPU : ARM::FPUNames) {
if (CandidateFPU.FPUVer == InputFPU.FPUVer &&
CandidateFPU.NeonSupport == InputFPU.NeonSupport &&
CandidateFPU.Restriction == ARM::FPURestriction::D16) {
return CandidateFPU.ID;
}
}
// nothing found
return ARM::FK_INVALID;
}
bool ARM::appendArchExtFeatures(StringRef CPU, ARM::ArchKind AK,
StringRef ArchExt,
std::vector<StringRef> &Features,
unsigned &ArgFPUID) {
size_t StartingNumFeatures = Features.size();
const bool Negated = stripNegationPrefix(ArchExt);
uint64_t ID = parseArchExt(ArchExt);
if (ID == AEK_INVALID)
return false;
for (const auto &AE : ARCHExtNames) {
if (Negated) {
if ((AE.ID & ID) == ID && AE.NegFeature)
Features.push_back(AE.NegFeature);
} else {
if ((AE.ID & ID) == AE.ID && AE.Feature)
Features.push_back(AE.Feature);
}
}
if (CPU == "")
CPU = "generic";
if (ArchExt == "fp" || ArchExt == "fp.dp") {
unsigned FPUKind;
if (ArchExt == "fp.dp") {
if (Negated) {
Features.push_back("-fp64");
return true;
}
FPUKind = findDoublePrecisionFPU(getDefaultFPU(CPU, AK));
} else if (Negated) {
FPUKind = ARM::FK_NONE;
} else {
FPUKind = getDefaultFPU(CPU, AK);
}
ArgFPUID = FPUKind;
return ARM::getFPUFeatures(FPUKind, Features);
}
return StartingNumFeatures != Features.size();
}
StringRef ARM::getHWDivName(uint64_t HWDivKind) {
for (const auto &D : HWDivNames) {
if (HWDivKind == D.ID)
return D.getName();
}
return StringRef();
}
StringRef ARM::getDefaultCPU(StringRef Arch) {
ArchKind AK = parseArch(Arch);
if (AK == ArchKind::INVALID)
return StringRef();
// Look for multiple AKs to find the default for pair AK+Name.
for (const auto &CPU : CPUNames) {
if (CPU.ArchID == AK && CPU.Default)
return CPU.getName();
}
// If we can't find a default then target the architecture instead
return "generic";
}
uint64_t ARM::parseHWDiv(StringRef HWDiv) {
StringRef Syn = getHWDivSynonym(HWDiv);
for (const auto &D : HWDivNames) {
if (Syn == D.getName())
return D.ID;
}
return AEK_INVALID;
}
uint64_t ARM::parseArchExt(StringRef ArchExt) {
for (const auto &A : ARCHExtNames) {
if (ArchExt == A.getName())
return A.ID;
}
return AEK_INVALID;
}
ARM::ArchKind ARM::parseCPUArch(StringRef CPU) {
for (const auto &C : CPUNames) {
if (CPU == C.getName())
return C.ArchID;
}
return ArchKind::INVALID;
}
void ARM::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values) {
for (const CpuNames<ArchKind> &Arch : CPUNames) {
if (Arch.ArchID != ArchKind::INVALID)
Values.push_back(Arch.getName());
}
}
StringRef ARM::computeDefaultTargetABI(const Triple &TT, StringRef CPU) {
StringRef ArchName =
CPU.empty() ? TT.getArchName() : getArchName(parseCPUArch(CPU));
if (TT.isOSBinFormatMachO()) {
if (TT.getEnvironment() == Triple::EABI ||
TT.getOS() == Triple::UnknownOS ||
parseArchProfile(ArchName) == ProfileKind::M)
return "aapcs";
if (TT.isWatchABI())
return "aapcs16";
return "apcs-gnu";
} else if (TT.isOSWindows())
// FIXME: this is invalid for WindowsCE.
return "aapcs";
// Select the default based on the platform.
switch (TT.getEnvironment()) {
case Triple::Android:
case Triple::GNUEABI:
case Triple::GNUEABIHF:
case Triple::MuslEABI:
case Triple::MuslEABIHF:
return "aapcs-linux";
case Triple::EABIHF:
case Triple::EABI:
return "aapcs";
default:
if (TT.isOSNetBSD())
return "apcs-gnu";
if (TT.isOSOpenBSD())
return "aapcs-linux";
return "aapcs";
}
}
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