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"
20 using 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
28 WebAssemblySubtarget &
initializeSubtargetDependencies(StringRef FS)29 WebAssemblySubtarget::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
WebAssemblySubtarget(const Triple & TT,const std::string & CPU,const std::string & FS,const TargetMachine & TM)39 WebAssemblySubtarget::WebAssemblySubtarget(const Triple &TT,
40 const std::string &CPU,
41 const std::string &FS,
42 const TargetMachine &TM)
43 : WebAssemblyGenSubtargetInfo(TT, CPU, FS), HasSIMD128(false),
44 HasAtomics(false), HasNontrappingFPToInt(false), HasSignExt(false),
45 HasExceptionHandling(false), CPUString(CPU), TargetTriple(TT),
46 FrameLowering(), InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
47 TLInfo(TM, *this) {}
48
enableMachineScheduler() const49 bool WebAssemblySubtarget::enableMachineScheduler() const {
50 // Disable the MachineScheduler for now. Even with ShouldTrackPressure set and
51 // enableMachineSchedDefaultSched overridden, it appears to have an overall
52 // negative effect for the kinds of register optimizations we're doing.
53 return false;
54 }
55
useAA() const56 bool WebAssemblySubtarget::useAA() const { return true; }
57