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llvm-project/llvm/lib/CodeGen/CommandFlags.cpp

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//===-- CommandFlags.cpp - Command Line Flags Interface ---------*- 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 contains codegen-specific flags that are shared between different
// command line tools. The tools "llc" and "opt" both use this file to prevent
// flag duplication.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/CommandFlags.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
#define CGOPT(TY, NAME) \
static cl::opt<TY> *NAME##View; \
TY codegen::get##NAME() { \
assert(NAME##View && "RegisterCodeGenFlags not created."); \
return *NAME##View; \
}
#define CGLIST(TY, NAME) \
static cl::list<TY> *NAME##View; \
std::vector<TY> codegen::get##NAME() { \
assert(NAME##View && "RegisterCodeGenFlags not created."); \
return *NAME##View; \
}
#define CGOPT_EXP(TY, NAME) \
CGOPT(TY, NAME) \
Optional<TY> codegen::getExplicit##NAME() { \
if (NAME##View->getNumOccurrences()) { \
TY res = *NAME##View; \
return res; \
} \
return None; \
}
CGOPT(std::string, MArch)
CGOPT(std::string, MCPU)
CGLIST(std::string, MAttrs)
CGOPT_EXP(Reloc::Model, RelocModel)
CGOPT(ThreadModel::Model, ThreadModel)
CGOPT_EXP(CodeModel::Model, CodeModel)
CGOPT(ExceptionHandling, ExceptionModel)
CGOPT_EXP(CodeGenFileType, FileType)
CGOPT(FramePointerKind, FramePointerUsage)
CGOPT(bool, EnableUnsafeFPMath)
CGOPT(bool, EnableNoInfsFPMath)
CGOPT(bool, EnableNoNaNsFPMath)
CGOPT(bool, EnableNoSignedZerosFPMath)
CGOPT(bool, EnableNoTrappingFPMath)
CGOPT(bool, EnableAIXExtendedAltivecABI)
CGOPT(DenormalMode::DenormalModeKind, DenormalFPMath)
CGOPT(DenormalMode::DenormalModeKind, DenormalFP32Math)
CGOPT(bool, EnableHonorSignDependentRoundingFPMath)
CGOPT(FloatABI::ABIType, FloatABIForCalls)
CGOPT(FPOpFusion::FPOpFusionMode, FuseFPOps)
CGOPT(SwiftAsyncFramePointerMode, SwiftAsyncFramePointer)
CGOPT(bool, DontPlaceZerosInBSS)
CGOPT(bool, EnableGuaranteedTailCallOpt)
CGOPT(bool, DisableTailCalls)
CGOPT(bool, StackSymbolOrdering)
CGOPT(bool, StackRealign)
CGOPT(std::string, TrapFuncName)
CGOPT(bool, UseCtors)
CGOPT(bool, RelaxELFRelocations)
CGOPT_EXP(bool, DataSections)
CGOPT_EXP(bool, FunctionSections)
CGOPT(bool, IgnoreXCOFFVisibility)
CGOPT(bool, XCOFFTracebackTable)
CGOPT(std::string, BBSections)
CGOPT(unsigned, TLSSize)
CGOPT(bool, EmulatedTLS)
CGOPT(bool, UniqueSectionNames)
CGOPT(bool, UniqueBasicBlockSectionNames)
CGOPT(EABI, EABIVersion)
CGOPT(DebuggerKind, DebuggerTuningOpt)
CGOPT(bool, EnableStackSizeSection)
CGOPT(bool, EnableAddrsig)
CGOPT(bool, EmitCallSiteInfo)
CGOPT(bool, EnableMachineFunctionSplitter)
CGOPT(bool, EnableDebugEntryValues)
CGOPT(bool, ValueTrackingVariableLocations)
CGOPT(bool, ForceDwarfFrameSection)
CGOPT(bool, XRayOmitFunctionIndex)
CGOPT(bool, DebugStrictDwarf)
CGOPT(unsigned, AlignLoops)
codegen::RegisterCodeGenFlags::RegisterCodeGenFlags() {
#define CGBINDOPT(NAME) \
do { \
NAME##View = std::addressof(NAME); \
} while (0)
static cl::opt<std::string> MArch(
"march", cl::desc("Architecture to generate code for (see --version)"));
CGBINDOPT(MArch);
static cl::opt<std::string> MCPU(
"mcpu", cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"), cl::init(""));
CGBINDOPT(MCPU);
static cl::list<std::string> MAttrs(
"mattr", cl::CommaSeparated,
cl::desc("Target specific attributes (-mattr=help for details)"),
cl::value_desc("a1,+a2,-a3,..."));
CGBINDOPT(MAttrs);
static cl::opt<Reloc::Model> RelocModel(
"relocation-model", cl::desc("Choose relocation model"),
cl::values(
clEnumValN(Reloc::Static, "static", "Non-relocatable code"),
clEnumValN(Reloc::PIC_, "pic",
"Fully relocatable, position independent code"),
clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
"Relocatable external references, non-relocatable code"),
clEnumValN(
Reloc::ROPI, "ropi",
"Code and read-only data relocatable, accessed PC-relative"),
clEnumValN(
Reloc::RWPI, "rwpi",
"Read-write data relocatable, accessed relative to static base"),
clEnumValN(Reloc::ROPI_RWPI, "ropi-rwpi",
"Combination of ropi and rwpi")));
CGBINDOPT(RelocModel);
static cl::opt<ThreadModel::Model> ThreadModel(
"thread-model", cl::desc("Choose threading model"),
cl::init(ThreadModel::POSIX),
cl::values(
clEnumValN(ThreadModel::POSIX, "posix", "POSIX thread model"),
clEnumValN(ThreadModel::Single, "single", "Single thread model")));
CGBINDOPT(ThreadModel);
static cl::opt<CodeModel::Model> CodeModel(
"code-model", cl::desc("Choose code model"),
cl::values(clEnumValN(CodeModel::Tiny, "tiny", "Tiny code model"),
clEnumValN(CodeModel::Small, "small", "Small code model"),
clEnumValN(CodeModel::Kernel, "kernel", "Kernel code model"),
clEnumValN(CodeModel::Medium, "medium", "Medium code model"),
clEnumValN(CodeModel::Large, "large", "Large code model")));
CGBINDOPT(CodeModel);
static cl::opt<ExceptionHandling> ExceptionModel(
"exception-model", cl::desc("exception model"),
cl::init(ExceptionHandling::None),
cl::values(
clEnumValN(ExceptionHandling::None, "default",
"default exception handling model"),
clEnumValN(ExceptionHandling::DwarfCFI, "dwarf",
"DWARF-like CFI based exception handling"),
clEnumValN(ExceptionHandling::SjLj, "sjlj",
"SjLj exception handling"),
clEnumValN(ExceptionHandling::ARM, "arm", "ARM EHABI exceptions"),
clEnumValN(ExceptionHandling::WinEH, "wineh",
"Windows exception model"),
clEnumValN(ExceptionHandling::Wasm, "wasm",
"WebAssembly exception handling")));
CGBINDOPT(ExceptionModel);
static cl::opt<CodeGenFileType> FileType(
"filetype", cl::init(CGFT_AssemblyFile),
cl::desc(
"Choose a file type (not all types are supported by all targets):"),
cl::values(
clEnumValN(CGFT_AssemblyFile, "asm", "Emit an assembly ('.s') file"),
clEnumValN(CGFT_ObjectFile, "obj",
"Emit a native object ('.o') file"),
clEnumValN(CGFT_Null, "null",
"Emit nothing, for performance testing")));
CGBINDOPT(FileType);
static cl::opt<FramePointerKind> FramePointerUsage(
"frame-pointer",
cl::desc("Specify frame pointer elimination optimization"),
cl::init(FramePointerKind::None),
cl::values(
clEnumValN(FramePointerKind::All, "all",
"Disable frame pointer elimination"),
clEnumValN(FramePointerKind::NonLeaf, "non-leaf",
"Disable frame pointer elimination for non-leaf frame"),
clEnumValN(FramePointerKind::None, "none",
"Enable frame pointer elimination")));
CGBINDOPT(FramePointerUsage);
static cl::opt<bool> EnableUnsafeFPMath(
"enable-unsafe-fp-math",
cl::desc("Enable optimizations that may decrease FP precision"),
cl::init(false));
CGBINDOPT(EnableUnsafeFPMath);
static cl::opt<bool> EnableNoInfsFPMath(
"enable-no-infs-fp-math",
cl::desc("Enable FP math optimizations that assume no +-Infs"),
cl::init(false));
CGBINDOPT(EnableNoInfsFPMath);
static cl::opt<bool> EnableNoNaNsFPMath(
"enable-no-nans-fp-math",
cl::desc("Enable FP math optimizations that assume no NaNs"),
cl::init(false));
CGBINDOPT(EnableNoNaNsFPMath);
static cl::opt<bool> EnableNoSignedZerosFPMath(
"enable-no-signed-zeros-fp-math",
cl::desc("Enable FP math optimizations that assume "
"the sign of 0 is insignificant"),
cl::init(false));
CGBINDOPT(EnableNoSignedZerosFPMath);
static cl::opt<bool> EnableNoTrappingFPMath(
"enable-no-trapping-fp-math",
cl::desc("Enable setting the FP exceptions build "
"attribute not to use exceptions"),
cl::init(false));
CGBINDOPT(EnableNoTrappingFPMath);
static const auto DenormFlagEnumOptions =
cl::values(clEnumValN(DenormalMode::IEEE, "ieee",
"IEEE 754 denormal numbers"),
clEnumValN(DenormalMode::PreserveSign, "preserve-sign",
"the sign of a flushed-to-zero number is preserved "
"in the sign of 0"),
clEnumValN(DenormalMode::PositiveZero, "positive-zero",
"denormals are flushed to positive zero"));
// FIXME: Doesn't have way to specify separate input and output modes.
static cl::opt<DenormalMode::DenormalModeKind> DenormalFPMath(
"denormal-fp-math",
cl::desc("Select which denormal numbers the code is permitted to require"),
cl::init(DenormalMode::IEEE),
DenormFlagEnumOptions);
CGBINDOPT(DenormalFPMath);
static cl::opt<DenormalMode::DenormalModeKind> DenormalFP32Math(
"denormal-fp-math-f32",
cl::desc("Select which denormal numbers the code is permitted to require for float"),
cl::init(DenormalMode::Invalid),
DenormFlagEnumOptions);
CGBINDOPT(DenormalFP32Math);
static cl::opt<bool> EnableHonorSignDependentRoundingFPMath(
"enable-sign-dependent-rounding-fp-math", cl::Hidden,
cl::desc("Force codegen to assume rounding mode can change dynamically"),
cl::init(false));
CGBINDOPT(EnableHonorSignDependentRoundingFPMath);
static cl::opt<FloatABI::ABIType> FloatABIForCalls(
"float-abi", cl::desc("Choose float ABI type"),
cl::init(FloatABI::Default),
cl::values(clEnumValN(FloatABI::Default, "default",
"Target default float ABI type"),
clEnumValN(FloatABI::Soft, "soft",
"Soft float ABI (implied by -soft-float)"),
clEnumValN(FloatABI::Hard, "hard",
"Hard float ABI (uses FP registers)")));
CGBINDOPT(FloatABIForCalls);
static cl::opt<FPOpFusion::FPOpFusionMode> FuseFPOps(
"fp-contract", cl::desc("Enable aggressive formation of fused FP ops"),
cl::init(FPOpFusion::Standard),
cl::values(
clEnumValN(FPOpFusion::Fast, "fast",
"Fuse FP ops whenever profitable"),
clEnumValN(FPOpFusion::Standard, "on", "Only fuse 'blessed' FP ops."),
clEnumValN(FPOpFusion::Strict, "off",
"Only fuse FP ops when the result won't be affected.")));
CGBINDOPT(FuseFPOps);
static cl::opt<SwiftAsyncFramePointerMode> SwiftAsyncFramePointer(
"swift-async-fp",
cl::desc("Determine when the Swift async frame pointer should be set"),
cl::init(SwiftAsyncFramePointerMode::Always),
cl::values(clEnumValN(SwiftAsyncFramePointerMode::DeploymentBased, "auto",
"Determine based on deployment target"),
clEnumValN(SwiftAsyncFramePointerMode::Always, "always",
"Always set the bit"),
clEnumValN(SwiftAsyncFramePointerMode::Never, "never",
"Never set the bit")));
CGBINDOPT(SwiftAsyncFramePointer);
static cl::opt<bool> DontPlaceZerosInBSS(
"nozero-initialized-in-bss",
cl::desc("Don't place zero-initialized symbols into bss section"),
cl::init(false));
CGBINDOPT(DontPlaceZerosInBSS);
static cl::opt<bool> EnableAIXExtendedAltivecABI(
"vec-extabi", cl::desc("Enable the AIX Extended Altivec ABI."),
cl::init(false));
CGBINDOPT(EnableAIXExtendedAltivecABI);
static cl::opt<bool> EnableGuaranteedTailCallOpt(
"tailcallopt",
cl::desc(
"Turn fastcc calls into tail calls by (potentially) changing ABI."),
cl::init(false));
CGBINDOPT(EnableGuaranteedTailCallOpt);
static cl::opt<bool> DisableTailCalls(
"disable-tail-calls", cl::desc("Never emit tail calls"), cl::init(false));
CGBINDOPT(DisableTailCalls);
static cl::opt<bool> StackSymbolOrdering(
"stack-symbol-ordering", cl::desc("Order local stack symbols."),
cl::init(true));
CGBINDOPT(StackSymbolOrdering);
static cl::opt<bool> StackRealign(
"stackrealign",
cl::desc("Force align the stack to the minimum alignment"),
cl::init(false));
CGBINDOPT(StackRealign);
static cl::opt<std::string> TrapFuncName(
"trap-func", cl::Hidden,
cl::desc("Emit a call to trap function rather than a trap instruction"),
cl::init(""));
CGBINDOPT(TrapFuncName);
static cl::opt<bool> UseCtors("use-ctors",
cl::desc("Use .ctors instead of .init_array."),
cl::init(false));
CGBINDOPT(UseCtors);
static cl::opt<bool> RelaxELFRelocations(
"relax-elf-relocations",
cl::desc(
"Emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL on x86-64 ELF"),
cl::init(false));
CGBINDOPT(RelaxELFRelocations);
static cl::opt<bool> DataSections(
"data-sections", cl::desc("Emit data into separate sections"),
cl::init(false));
CGBINDOPT(DataSections);
static cl::opt<bool> FunctionSections(
"function-sections", cl::desc("Emit functions into separate sections"),
cl::init(false));
CGBINDOPT(FunctionSections);
static cl::opt<bool> IgnoreXCOFFVisibility(
"ignore-xcoff-visibility",
cl::desc("Not emit the visibility attribute for asm in AIX OS or give "
"all symbols 'unspecified' visibility in XCOFF object file"),
cl::init(false));
CGBINDOPT(IgnoreXCOFFVisibility);
static cl::opt<bool> XCOFFTracebackTable(
"xcoff-traceback-table", cl::desc("Emit the XCOFF traceback table"),
cl::init(true));
CGBINDOPT(XCOFFTracebackTable);
static cl::opt<std::string> BBSections(
"basic-block-sections",
cl::desc("Emit basic blocks into separate sections"),
cl::value_desc("all | <function list (file)> | labels | none"),
cl::init("none"));
CGBINDOPT(BBSections);
static cl::opt<unsigned> TLSSize(
"tls-size", cl::desc("Bit size of immediate TLS offsets"), cl::init(0));
CGBINDOPT(TLSSize);
static cl::opt<bool> EmulatedTLS(
"emulated-tls", cl::desc("Use emulated TLS model"), cl::init(false));
CGBINDOPT(EmulatedTLS);
static cl::opt<bool> UniqueSectionNames(
"unique-section-names", cl::desc("Give unique names to every section"),
cl::init(true));
CGBINDOPT(UniqueSectionNames);
static cl::opt<bool> UniqueBasicBlockSectionNames(
"unique-basic-block-section-names",
cl::desc("Give unique names to every basic block section"),
cl::init(false));
CGBINDOPT(UniqueBasicBlockSectionNames);
static cl::opt<EABI> EABIVersion(
"meabi", cl::desc("Set EABI type (default depends on triple):"),
cl::init(EABI::Default),
cl::values(
clEnumValN(EABI::Default, "default", "Triple default EABI version"),
clEnumValN(EABI::EABI4, "4", "EABI version 4"),
clEnumValN(EABI::EABI5, "5", "EABI version 5"),
clEnumValN(EABI::GNU, "gnu", "EABI GNU")));
CGBINDOPT(EABIVersion);
static cl::opt<DebuggerKind> DebuggerTuningOpt(
"debugger-tune", cl::desc("Tune debug info for a particular debugger"),
cl::init(DebuggerKind::Default),
cl::values(
clEnumValN(DebuggerKind::GDB, "gdb", "gdb"),
clEnumValN(DebuggerKind::LLDB, "lldb", "lldb"),
clEnumValN(DebuggerKind::DBX, "dbx", "dbx"),
clEnumValN(DebuggerKind::SCE, "sce", "SCE targets (e.g. PS4)")));
CGBINDOPT(DebuggerTuningOpt);
static cl::opt<bool> EnableStackSizeSection(
"stack-size-section",
cl::desc("Emit a section containing stack size metadata"),
cl::init(false));
CGBINDOPT(EnableStackSizeSection);
static cl::opt<bool> EnableAddrsig(
"addrsig", cl::desc("Emit an address-significance table"),
cl::init(false));
CGBINDOPT(EnableAddrsig);
static cl::opt<bool> EmitCallSiteInfo(
"emit-call-site-info",
cl::desc(
"Emit call site debug information, if debug information is enabled."),
cl::init(false));
CGBINDOPT(EmitCallSiteInfo);
static cl::opt<bool> EnableDebugEntryValues(
"debug-entry-values",
cl::desc("Enable debug info for the debug entry values."),
cl::init(false));
CGBINDOPT(EnableDebugEntryValues);
static cl::opt<bool> ValueTrackingVariableLocations(
"experimental-debug-variable-locations",
cl::desc("Use experimental new value-tracking variable locations"),
cl::init(false));
CGBINDOPT(ValueTrackingVariableLocations);
static cl::opt<bool> EnableMachineFunctionSplitter(
"split-machine-functions",
cl::desc("Split out cold basic blocks from machine functions based on "
"profile information"),
cl::init(false));
CGBINDOPT(EnableMachineFunctionSplitter);
static cl::opt<bool> ForceDwarfFrameSection(
"force-dwarf-frame-section",
cl::desc("Always emit a debug frame section."), cl::init(false));
CGBINDOPT(ForceDwarfFrameSection);
static cl::opt<bool> XRayOmitFunctionIndex(
"no-xray-index", cl::desc("Don't emit xray_fn_idx section"),
cl::init(false));
CGBINDOPT(XRayOmitFunctionIndex);
static cl::opt<bool> DebugStrictDwarf(
"strict-dwarf", cl::desc("use strict dwarf"), cl::init(false));
CGBINDOPT(DebugStrictDwarf);
static cl::opt<unsigned> AlignLoops("align-loops",
cl::desc("Default alignment for loops"));
CGBINDOPT(AlignLoops);
#undef CGBINDOPT
mc::RegisterMCTargetOptionsFlags();
}
llvm::BasicBlockSection
codegen::getBBSectionsMode(llvm::TargetOptions &Options) {
if (getBBSections() == "all")
return BasicBlockSection::All;
else if (getBBSections() == "labels")
return BasicBlockSection::Labels;
else if (getBBSections() == "none")
return BasicBlockSection::None;
else {
ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
MemoryBuffer::getFile(getBBSections());
if (!MBOrErr) {
errs() << "Error loading basic block sections function list file: "
<< MBOrErr.getError().message() << "\n";
} else {
Options.BBSectionsFuncListBuf = std::move(*MBOrErr);
}
return BasicBlockSection::List;
}
}
// Common utility function tightly tied to the options listed here. Initializes
// a TargetOptions object with CodeGen flags and returns it.
TargetOptions
codegen::InitTargetOptionsFromCodeGenFlags(const Triple &TheTriple) {
TargetOptions Options;
Options.AllowFPOpFusion = getFuseFPOps();
Options.UnsafeFPMath = getEnableUnsafeFPMath();
Options.NoInfsFPMath = getEnableNoInfsFPMath();
Options.NoNaNsFPMath = getEnableNoNaNsFPMath();
Options.NoSignedZerosFPMath = getEnableNoSignedZerosFPMath();
Options.NoTrappingFPMath = getEnableNoTrappingFPMath();
DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
// FIXME: Should have separate input and output flags
Options.setFPDenormalMode(DenormalMode(DenormKind, DenormKind));
Options.HonorSignDependentRoundingFPMathOption =
getEnableHonorSignDependentRoundingFPMath();
if (getFloatABIForCalls() != FloatABI::Default)
Options.FloatABIType = getFloatABIForCalls();
Options.EnableAIXExtendedAltivecABI = getEnableAIXExtendedAltivecABI();
Options.NoZerosInBSS = getDontPlaceZerosInBSS();
Options.GuaranteedTailCallOpt = getEnableGuaranteedTailCallOpt();
Options.StackSymbolOrdering = getStackSymbolOrdering();
Options.UseInitArray = !getUseCtors();
Options.RelaxELFRelocations = getRelaxELFRelocations();
Options.DataSections =
getExplicitDataSections().getValueOr(TheTriple.hasDefaultDataSections());
Options.FunctionSections = getFunctionSections();
Options.IgnoreXCOFFVisibility = getIgnoreXCOFFVisibility();
Options.XCOFFTracebackTable = getXCOFFTracebackTable();
Options.BBSections = getBBSectionsMode(Options);
Options.UniqueSectionNames = getUniqueSectionNames();
Options.UniqueBasicBlockSectionNames = getUniqueBasicBlockSectionNames();
Options.TLSSize = getTLSSize();
Options.EmulatedTLS = getEmulatedTLS();
Options.ExplicitEmulatedTLS = EmulatedTLSView->getNumOccurrences() > 0;
Options.ExceptionModel = getExceptionModel();
Options.EmitStackSizeSection = getEnableStackSizeSection();
Options.EnableMachineFunctionSplitter = getEnableMachineFunctionSplitter();
Options.EmitAddrsig = getEnableAddrsig();
Options.EmitCallSiteInfo = getEmitCallSiteInfo();
Options.EnableDebugEntryValues = getEnableDebugEntryValues();
Options.ValueTrackingVariableLocations = getValueTrackingVariableLocations();
Options.ForceDwarfFrameSection = getForceDwarfFrameSection();
Options.XRayOmitFunctionIndex = getXRayOmitFunctionIndex();
Options.DebugStrictDwarf = getDebugStrictDwarf();
Options.LoopAlignment = getAlignLoops();
Options.MCOptions = mc::InitMCTargetOptionsFromFlags();
Options.ThreadModel = getThreadModel();
Options.EABIVersion = getEABIVersion();
Options.DebuggerTuning = getDebuggerTuningOpt();
Options.SwiftAsyncFramePointer = getSwiftAsyncFramePointer();
return Options;
}
std::string codegen::getCPUStr() {
// If user asked for the 'native' CPU, autodetect here. If autodection fails,
// this will set the CPU to an empty string which tells the target to
// pick a basic default.
if (getMCPU() == "native")
return std::string(sys::getHostCPUName());
return getMCPU();
}
std::string codegen::getFeaturesStr() {
SubtargetFeatures Features;
// If user asked for the 'native' CPU, we need to autodetect features.
// This is necessary for x86 where the CPU might not support all the
// features the autodetected CPU name lists in the target. For example,
// not all Sandybridge processors support AVX.
if (getMCPU() == "native") {
StringMap<bool> HostFeatures;
if (sys::getHostCPUFeatures(HostFeatures))
for (auto &F : HostFeatures)
Features.AddFeature(F.first(), F.second);
}
for (auto const &MAttr : getMAttrs())
Features.AddFeature(MAttr);
return Features.getString();
}
std::vector<std::string> codegen::getFeatureList() {
SubtargetFeatures Features;
// If user asked for the 'native' CPU, we need to autodetect features.
// This is necessary for x86 where the CPU might not support all the
// features the autodetected CPU name lists in the target. For example,
// not all Sandybridge processors support AVX.
if (getMCPU() == "native") {
StringMap<bool> HostFeatures;
if (sys::getHostCPUFeatures(HostFeatures))
for (auto &F : HostFeatures)
Features.AddFeature(F.first(), F.second);
}
for (auto const &MAttr : getMAttrs())
Features.AddFeature(MAttr);
return Features.getFeatures();
}
void codegen::renderBoolStringAttr(AttrBuilder &B, StringRef Name, bool Val) {
B.addAttribute(Name, Val ? "true" : "false");
}
#define HANDLE_BOOL_ATTR(CL, AttrName) \
do { \
if (CL->getNumOccurrences() > 0 && !F.hasFnAttribute(AttrName)) \
renderBoolStringAttr(NewAttrs, AttrName, *CL); \
} while (0)
/// Set function attributes of function \p F based on CPU, Features, and command
/// line flags.
void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
Function &F) {
auto &Ctx = F.getContext();
AttributeList Attrs = F.getAttributes();
AttrBuilder NewAttrs;
if (!CPU.empty() && !F.hasFnAttribute("target-cpu"))
NewAttrs.addAttribute("target-cpu", CPU);
if (!Features.empty()) {
// Append the command line features to any that are already on the function.
StringRef OldFeatures =
F.getFnAttribute("target-features").getValueAsString();
if (OldFeatures.empty())
NewAttrs.addAttribute("target-features", Features);
else {
SmallString<256> Appended(OldFeatures);
Appended.push_back(',');
Appended.append(Features);
NewAttrs.addAttribute("target-features", Appended);
}
}
if (FramePointerUsageView->getNumOccurrences() > 0 &&
!F.hasFnAttribute("frame-pointer")) {
if (getFramePointerUsage() == FramePointerKind::All)
NewAttrs.addAttribute("frame-pointer", "all");
else if (getFramePointerUsage() == FramePointerKind::NonLeaf)
NewAttrs.addAttribute("frame-pointer", "non-leaf");
else if (getFramePointerUsage() == FramePointerKind::None)
NewAttrs.addAttribute("frame-pointer", "none");
}
if (DisableTailCallsView->getNumOccurrences() > 0)
NewAttrs.addAttribute("disable-tail-calls",
toStringRef(getDisableTailCalls()));
if (getStackRealign())
NewAttrs.addAttribute("stackrealign");
HANDLE_BOOL_ATTR(EnableUnsafeFPMathView, "unsafe-fp-math");
HANDLE_BOOL_ATTR(EnableNoInfsFPMathView, "no-infs-fp-math");
HANDLE_BOOL_ATTR(EnableNoNaNsFPMathView, "no-nans-fp-math");
HANDLE_BOOL_ATTR(EnableNoSignedZerosFPMathView, "no-signed-zeros-fp-math");
if (DenormalFPMathView->getNumOccurrences() > 0 &&
!F.hasFnAttribute("denormal-fp-math")) {
DenormalMode::DenormalModeKind DenormKind = getDenormalFPMath();
// FIXME: Command line flag should expose separate input/output modes.
NewAttrs.addAttribute("denormal-fp-math",
DenormalMode(DenormKind, DenormKind).str());
}
if (DenormalFP32MathView->getNumOccurrences() > 0 &&
!F.hasFnAttribute("denormal-fp-math-f32")) {
// FIXME: Command line flag should expose separate input/output modes.
DenormalMode::DenormalModeKind DenormKind = getDenormalFP32Math();
NewAttrs.addAttribute(
"denormal-fp-math-f32",
DenormalMode(DenormKind, DenormKind).str());
}
if (TrapFuncNameView->getNumOccurrences() > 0)
for (auto &B : F)
for (auto &I : B)
if (auto *Call = dyn_cast<CallInst>(&I))
if (const auto *F = Call->getCalledFunction())
if (F->getIntrinsicID() == Intrinsic::debugtrap ||
F->getIntrinsicID() == Intrinsic::trap)
Call->addFnAttr(
Attribute::get(Ctx, "trap-func-name", getTrapFuncName()));
// Let NewAttrs override Attrs.
F.setAttributes(Attrs.addFnAttributes(Ctx, NewAttrs));
}
/// Set function attributes of functions in Module M based on CPU,
/// Features, and command line flags.
void codegen::setFunctionAttributes(StringRef CPU, StringRef Features,
Module &M) {
for (Function &F : M)
setFunctionAttributes(CPU, Features, F);
}
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