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