WebAssemblySubtarget.cpp revision 344779 
1//===-- WebAssemblySubtarget.cpp - WebAssembly Subtarget Information ------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9///
10/// \file
11/// This file implements the WebAssembly-specific subclass of
12/// TargetSubtarget.
13///
14//===----------------------------------------------------------------------===//
15
16#include "WebAssemblySubtarget.h"
17#include "MCTargetDesc/WebAssemblyMCTargetDesc.h"
18#include "WebAssemblyInstrInfo.h"
19#include "llvm/Support/TargetRegistry.h"
20using namespace llvm;
21
22#define DEBUG_TYPE "wasm-subtarget"
23
24#define GET_SUBTARGETINFO_CTOR
25#define GET_SUBTARGETINFO_TARGET_DESC
26#include "WebAssemblyGenSubtargetInfo.inc"
27
28WebAssemblySubtarget &
29WebAssemblySubtarget::initializeSubtargetDependencies(StringRef FS) {
30  // Determine default and user-specified characteristics
31
32  if (CPUString.empty())
33    CPUString = "generic";
34
35  ParseSubtargetFeatures(CPUString, FS);
36  return *this;
37}
38
39WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT,
40                                           const std::string &CPU,
41                                           const std::string &FS,
42                                           const TargetMachine &TM)
43    : WebAssemblyGenSubtargetInfo(TT, CPU, FS), CPUString(CPU),
44      TargetTriple(TT), FrameLowering(),
45      InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
46      TLInfo(TM, *this) {}
47
48bool WebAssemblySubtarget::enableMachineScheduler() const {
49  // Disable the MachineScheduler for now. Even with ShouldTrackPressure set and
50  // enableMachineSchedDefaultSched overridden, it appears to have an overall
51  // negative effect for the kinds of register optimizations we're doing.
52  return false;
53}
54
55bool WebAssemblySubtarget::useAA() const { return true; }
56