WebAssemblySubtarget.cpp
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//===-- WebAssemblySubtarget.cpp - WebAssembly Subtarget Information ------===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the WebAssembly-specific subclass of
/// TargetSubtarget.
///
//===----------------------------------------------------------------------===//
#include "WebAssemblySubtarget.h"
#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
#include "WebAssemblyInstrInfo.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "wasm-subtarget"
#define GET_SUBTARGETINFO_CTOR
#define GET_SUBTARGETINFO_TARGET_DESC
#include "WebAssemblyGenSubtargetInfo.inc"
WebAssemblySubtarget &
WebAssemblySubtarget::initializeSubtargetDependencies(StringRef CPU,
StringRef FS) {
// Determine default and user-specified characteristics
LLVM_DEBUG(llvm::dbgs() << "initializeSubtargetDependencies\n");
if (CPU.empty())
CPU = "generic";
ParseSubtargetFeatures(CPU, FS);
return *this;
}
WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT,
const std::string &CPU,
const std::string &FS,
const TargetMachine &TM)
: WebAssemblyGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT),
FrameLowering(), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
TSInfo(), TLInfo(TM, *this) {}
bool WebAssemblySubtarget::enableAtomicExpand() const {
// If atomics are disabled, atomic ops are lowered instead of expanded
return hasAtomics();
}
bool WebAssemblySubtarget::enableMachineScheduler() const {
// Disable the MachineScheduler for now. Even with ShouldTrackPressure set and
// enableMachineSchedDefaultSched overridden, it appears to have an overall
// negative effect for the kinds of register optimizations we're doing.
return false;
}
bool WebAssemblySubtarget::useAA() const { return true; }