lib/Target/Sparc/SparcSubtarget.cpp

   1 //===-- SparcSubtarget.cpp - SPARC 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 // This file implements the SPARC specific subclass of TargetSubtargetInfo.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SparcSubtarget.h"
  15 #include "Sparc.h"
  16 #include "llvm/Support/MathExtras.h"
  17 #include "llvm/Support/TargetRegistry.h"
  18
  19 using namespace llvm;
  20
  21 #define DEBUG_TYPE "sparc-subtarget"
  22
  23 #define GET_SUBTARGETINFO_TARGET_DESC
  24 #define GET_SUBTARGETINFO_CTOR
  25 #include "SparcGenSubtargetInfo.inc"
  26
  27 void SparcSubtarget::anchor() { }
  28
  29 SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(StringRef CPU,
  30                                                                 StringRef FS) {
  31   UseSoftMulDiv = false;
  32   IsV9 = false;
  33   IsLeon = false;
  34   V8DeprecatedInsts = false;
  35   IsVIS = false;
  36   IsVIS2 = false;
  37   IsVIS3 = false;
  38   HasHardQuad = false;
  39   UsePopc = false;
  40   UseSoftFloat = false;
  41   HasNoFSMULD = false;
  42   HasNoFMULS = false;
  43
  44   // Leon features
  45   HasLeonCasa = false;
  46   HasUmacSmac = false;
  47   HasPWRPSR = false;
  48   InsertNOPLoad = false;
  49   FixAllFDIVSQRT = false;
  50   DetectRoundChange = false;
  51   HasLeonCycleCounter = false;
  52
  53   // Determine default and user specified characteristics
  54   std::string CPUName = CPU;
  55   if (CPUName.empty())
  56     CPUName = (Is64Bit) ? "v9" : "v8";
  57
  58   // Parse features string.
  59   ParseSubtargetFeatures(CPUName, FS);
  60
  61   // Popc is a v9-only instruction.
  62   if (!IsV9)
  63     UsePopc = false;
  64
  65   return *this;
  66 }
  67
  68 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
  69                                const std::string &FS, const TargetMachine &TM,
  70                                bool is64Bit)
  71     : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
  72       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
  73       FrameLowering(*this) {}
  74
  75 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
  76
  77   if (is64Bit()) {
  78     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
  79     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
  80     frameSize += 128;
  81     // Frames with calls must also reserve space for 6 outgoing arguments
  82     // whether they are used or not. LowerCall_64 takes care of that.
  83     frameSize = alignTo(frameSize, 16);
  84   } else {
  85     // Emit the correct save instruction based on the number of bytes in
  86     // the frame. Minimum stack frame size according to V8 ABI is:
  87     //   16 words for register window spill
  88     //    1 word for address of returned aggregate-value
  89     // +  6 words for passing parameters on the stack
  90     // ----------
  91     //   23 words * 4 bytes per word = 92 bytes
  92     frameSize += 92;
  93
  94     // Round up to next doubleword boundary -- a double-word boundary
  95     // is required by the ABI.
  96     frameSize = alignTo(frameSize, 8);
  97   }
  98   return frameSize;
  99 }
 100
 101 bool SparcSubtarget::enableMachineScheduler() const {
 102   return true;
 103 }