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//===- RuntimeLibcalls.cpp - Interface for runtime libcalls -----*- 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 "llvm/IR/RuntimeLibcalls.h"
#include "llvm/ADT/FloatingPointMode.h"
#include "llvm/ADT/StringTable.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/xxhash.h"
#include "llvm/TargetParser/ARMTargetParser.h"
#define DEBUG_TYPE "runtime-libcalls-info"
using namespace llvm;
using namespace RTLIB;
#define GET_RUNTIME_LIBCALLS_INFO
#define GET_INIT_RUNTIME_LIBCALL_NAMES
#define GET_SET_TARGET_RUNTIME_LIBCALL_SETS
#define DEFINE_GET_LOOKUP_LIBCALL_IMPL_NAME
#include "llvm/IR/RuntimeLibcalls.inc"
RuntimeLibcallsInfo::RuntimeLibcallsInfo(const Module &M)
: RuntimeLibcallsInfo(M.getTargetTriple()) {
// TODO: Consider module flags
}
/// Set default libcall names. If a target wants to opt-out of a libcall it
/// should be placed here.
void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
ExceptionHandling ExceptionModel,
FloatABI::ABIType FloatABI,
EABI EABIVersion, StringRef ABIName) {
setTargetRuntimeLibcallSets(TT, ExceptionModel, FloatABI, EABIVersion,
ABIName);
}
LLVM_ATTRIBUTE_ALWAYS_INLINE
iota_range<RTLIB::LibcallImpl>
RuntimeLibcallsInfo::libcallImplNameHit(uint16_t NameOffsetEntry,
uint16_t StrOffset) {
int NumAliases = 1;
for (uint16_t Entry : ArrayRef(RuntimeLibcallNameOffsetTable)
.drop_front(NameOffsetEntry + 1)) {
if (Entry != StrOffset)
break;
++NumAliases;
}
RTLIB::LibcallImpl ImplStart = static_cast<RTLIB::LibcallImpl>(
&RuntimeLibcallNameOffsetTable[NameOffsetEntry] -
&RuntimeLibcallNameOffsetTable[0]);
return enum_seq(ImplStart,
static_cast<RTLIB::LibcallImpl>(ImplStart + NumAliases));
}
bool RuntimeLibcallsInfo::isAAPCS_ABI(const Triple &TT, StringRef ABIName) {
const ARM::ARMABI TargetABI = ARM::computeTargetABI(TT, ABIName);
return TargetABI == ARM::ARM_ABI_AAPCS || TargetABI == ARM::ARM_ABI_AAPCS16;
}
bool RuntimeLibcallsInfo::darwinHasExp10(const Triple &TT) {
switch (TT.getOS()) {
case Triple::MacOSX:
return !TT.isMacOSXVersionLT(10, 9);
case Triple::IOS:
return !TT.isOSVersionLT(7, 0);
case Triple::DriverKit:
case Triple::TvOS:
case Triple::WatchOS:
case Triple::XROS:
case Triple::BridgeOS:
return true;
default:
return false;
}
}
std::pair<FunctionType *, AttributeList>
RuntimeLibcallsInfo::getFunctionTy(LLVMContext &Ctx, const Triple &TT,
const DataLayout &DL,
RTLIB::LibcallImpl LibcallImpl) const {
static constexpr Attribute::AttrKind CommonFnAttrs[] = {
Attribute::NoCallback, Attribute::NoFree, Attribute::NoSync,
Attribute::NoUnwind, Attribute::WillReturn};
switch (LibcallImpl) {
case RTLIB::impl___sincos_stret:
case RTLIB::impl___sincosf_stret: {
if (!darwinHasSinCosStret(TT)) // Non-darwin currently unexpected
return {};
Type *ScalarTy = LibcallImpl == RTLIB::impl___sincosf_stret
? Type::getFloatTy(Ctx)
: Type::getDoubleTy(Ctx);
AttrBuilder FuncAttrBuilder(Ctx);
for (Attribute::AttrKind Attr : CommonFnAttrs)
FuncAttrBuilder.addAttribute(Attr);
const bool UseSret =
TT.isX86_32() || ((TT.isARM() || TT.isThumb()) &&
ARM::computeTargetABI(TT) == ARM::ARM_ABI_APCS);
FuncAttrBuilder.addMemoryAttr(MemoryEffects::argumentOrErrnoMemOnly(
UseSret ? ModRefInfo::Mod : ModRefInfo::NoModRef, ModRefInfo::Mod));
AttributeList Attrs;
Attrs = Attrs.addFnAttributes(Ctx, FuncAttrBuilder);
if (UseSret) {
AttrBuilder AttrBuilder(Ctx);
StructType *StructTy = StructType::get(ScalarTy, ScalarTy);
AttrBuilder.addStructRetAttr(StructTy);
AttrBuilder.addAlignmentAttr(DL.getABITypeAlign(StructTy));
FunctionType *FuncTy = FunctionType::get(
Type::getVoidTy(Ctx), {DL.getAllocaPtrType(Ctx), ScalarTy}, false);
return {FuncTy, Attrs.addParamAttributes(Ctx, 0, AttrBuilder)};
}
Type *RetTy =
LibcallImpl == RTLIB::impl___sincosf_stret && TT.isX86_64()
? static_cast<Type *>(FixedVectorType::get(ScalarTy, 2))
: static_cast<Type *>(StructType::get(ScalarTy, ScalarTy));
return {FunctionType::get(RetTy, {ScalarTy}, false), Attrs};
}
case RTLIB::impl_sqrtf:
case RTLIB::impl_sqrt: {
AttrBuilder FuncAttrBuilder(Ctx);
for (Attribute::AttrKind Attr : CommonFnAttrs)
FuncAttrBuilder.addAttribute(Attr);
FuncAttrBuilder.addMemoryAttr(MemoryEffects::errnoMemOnly(ModRefInfo::Mod));
AttributeList Attrs;
Attrs = Attrs.addFnAttributes(Ctx, FuncAttrBuilder);
Type *ScalarTy = LibcallImpl == RTLIB::impl_sqrtf ? Type::getFloatTy(Ctx)
: Type::getDoubleTy(Ctx);
FunctionType *FuncTy = FunctionType::get(ScalarTy, {ScalarTy}, false);
Attrs = Attrs.addRetAttribute(
Ctx, Attribute::getWithNoFPClass(Ctx, fcNegInf | fcNegSubnormal |
fcNegNormal));
return {FuncTy, Attrs};
}
default:
return {};
}
return {};
}
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