1//===-- WebAssemblySubtarget.cpp - WebAssembly Subtarget Information ------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8/// 9/// \file 10/// This file implements the WebAssembly-specific subclass of 11/// TargetSubtarget. 12/// 13//===----------------------------------------------------------------------===// 14 15#include "WebAssemblySubtarget.h" 16#include "MCTargetDesc/WebAssemblyMCTargetDesc.h" 17#include "WebAssemblyInstrInfo.h" 18#include "llvm/Support/TargetRegistry.h" 19using namespace llvm; 20 21#define DEBUG_TYPE "wasm-subtarget" 22 23#define GET_SUBTARGETINFO_CTOR 24#define GET_SUBTARGETINFO_TARGET_DESC 25#include "WebAssemblyGenSubtargetInfo.inc" 26 27WebAssemblySubtarget & 28WebAssemblySubtarget::initializeSubtargetDependencies(StringRef CPU, 29 StringRef FS) { 30 // Determine default and user-specified characteristics 31 LLVM_DEBUG(llvm::dbgs() << "initializeSubtargetDependencies\n"); 32 33 if (CPU.empty()) 34 CPU = "generic"; 35 36 ParseSubtargetFeatures(CPU, FS); 37 return *this; 38} 39 40WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT, 41 const std::string &CPU, 42 const std::string &FS, 43 const TargetMachine &TM) 44 : WebAssemblyGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), 45 FrameLowering(), InstrInfo(initializeSubtargetDependencies(CPU, FS)), 46 TSInfo(), TLInfo(TM, *this) {} 47 48bool WebAssemblySubtarget::enableAtomicExpand() const { 49 // If atomics are disabled, atomic ops are lowered instead of expanded 50 return hasAtomics(); 51} 52 53bool WebAssemblySubtarget::enableMachineScheduler() const { 54 // Disable the MachineScheduler for now. Even with ShouldTrackPressure set and 55 // enableMachineSchedDefaultSched overridden, it appears to have an overall 56 // negative effect for the kinds of register optimizations we're doing. 57 return false; 58} 59 60bool WebAssemblySubtarget::useAA() const { return true; } 61