fe67267d19
There are several libcall choices for MUL_I64 which depend on the subtarget, but this is the base case. The manual custom ISelLowering is still overriding the decision until we have a way to control lowering choices, but we can still get the calling convention set for now.
99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
//===- RuntimeLibcalls.cpp - Interface for runtime libcalls -----*- 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 "llvm/IR/RuntimeLibcalls.h"
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#include "llvm/ADT/StringTable.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/xxhash.h"
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#include "llvm/TargetParser/ARMTargetParser.h"
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#define DEBUG_TYPE "runtime-libcalls-info"
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using namespace llvm;
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using namespace RTLIB;
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#define GET_INIT_RUNTIME_LIBCALL_NAMES
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#define GET_SET_TARGET_RUNTIME_LIBCALL_SETS
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#define DEFINE_GET_LOOKUP_LIBCALL_IMPL_NAME
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#include "llvm/IR/RuntimeLibcalls.inc"
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#undef GET_INIT_RUNTIME_LIBCALL_NAMES
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#undef GET_SET_TARGET_RUNTIME_LIBCALL_SETS
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#undef DEFINE_GET_LOOKUP_LIBCALL_IMPL_NAME
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/// Set default libcall names. If a target wants to opt-out of a libcall it
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/// should be placed here.
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void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
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ExceptionHandling ExceptionModel,
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FloatABI::ABIType FloatABI,
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EABI EABIVersion, StringRef ABIName) {
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setTargetRuntimeLibcallSets(TT, FloatABI, EABIVersion, ABIName);
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if (ExceptionModel == ExceptionHandling::SjLj)
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setLibcallImpl(RTLIB::UNWIND_RESUME, RTLIB::_Unwind_SjLj_Resume);
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if (TT.isARM() || TT.isThumb()) {
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// The half <-> float conversion functions are always soft-float on
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// non-watchos platforms, but are needed for some targets which use a
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// hard-float calling convention by default.
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if (!TT.isWatchABI()) {
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if (isAAPCS_ABI(TT, ABIName)) {
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setLibcallImplCallingConv(RTLIB::__truncsfhf2, CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__truncdfhf2, CallingConv::ARM_AAPCS);
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setLibcallImplCallingConv(RTLIB::__extendhfsf2, CallingConv::ARM_AAPCS);
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} else {
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setLibcallImplCallingConv(RTLIB::__truncsfhf2, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__truncdfhf2, CallingConv::ARM_APCS);
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setLibcallImplCallingConv(RTLIB::__extendhfsf2, CallingConv::ARM_APCS);
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}
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}
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return;
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}
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}
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LLVM_ATTRIBUTE_ALWAYS_INLINE
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iota_range<RTLIB::LibcallImpl>
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RuntimeLibcallsInfo::libcallImplNameHit(uint16_t NameOffsetEntry,
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uint16_t StrOffset) {
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int NumAliases = 1;
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for (uint16_t Entry : ArrayRef(RuntimeLibcallNameOffsetTable)
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.drop_front(NameOffsetEntry + 1)) {
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if (Entry != StrOffset)
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break;
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++NumAliases;
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}
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RTLIB::LibcallImpl ImplStart = static_cast<RTLIB::LibcallImpl>(
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&RuntimeLibcallNameOffsetTable[NameOffsetEntry] -
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&RuntimeLibcallNameOffsetTable[0]);
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return enum_seq(ImplStart,
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static_cast<RTLIB::LibcallImpl>(ImplStart + NumAliases));
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}
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bool RuntimeLibcallsInfo::isAAPCS_ABI(const Triple &TT, StringRef ABIName) {
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const ARM::ARMABI TargetABI = ARM::computeTargetABI(TT, ABIName);
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return TargetABI == ARM::ARM_ABI_AAPCS || TargetABI == ARM::ARM_ABI_AAPCS16;
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}
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bool RuntimeLibcallsInfo::darwinHasExp10(const Triple &TT) {
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switch (TT.getOS()) {
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case Triple::MacOSX:
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return !TT.isMacOSXVersionLT(10, 9);
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case Triple::IOS:
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return !TT.isOSVersionLT(7, 0);
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case Triple::DriverKit:
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case Triple::TvOS:
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case Triple::WatchOS:
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case Triple::XROS:
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case Triple::BridgeOS:
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return true;
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default:
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return false;
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}
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}
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