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      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 /// \brief 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 &
     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 
     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       CPUString(CPU), TargetTriple(TT), FrameLowering(),
     45       InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
     46       TLInfo(TM, *this) {}
     47 
     48 bool 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 
     55 bool WebAssemblySubtarget::useAA() const { return true; }
     56