lib/Target/Sparc/SparcSubtarget.cpp

   1 //===-- SparcSubtarget.cpp - SPARC 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 // This file implements the SPARC specific subclass of TargetSubtargetInfo.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "SparcSubtarget.h"
  14 #include "Sparc.h"
  15 #include "llvm/Support/MathExtras.h"
  16 #include "llvm/Support/TargetRegistry.h"
  17
  18 using namespace llvm;
  19
  20 #define DEBUG_TYPE "sparc-subtarget"
  21
  22 #define GET_SUBTARGETINFO_TARGET_DESC
  23 #define GET_SUBTARGETINFO_CTOR
  24 #include "SparcGenSubtargetInfo.inc"
  25
  26 void SparcSubtarget::anchor() { }
  27
  28 SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(StringRef CPU,
  29                                                                 StringRef FS) {
  30   UseSoftMulDiv = false;
  31   IsV9 = false;
  32   IsLeon = false;
  33   V8DeprecatedInsts = false;
  34   IsVIS = false;
  35   IsVIS2 = false;
  36   IsVIS3 = false;
  37   HasHardQuad = false;
  38   UsePopc = false;
  39   UseSoftFloat = false;
  40   HasNoFSMULD = false;
  41   HasNoFMULS = false;
  42
  43   // Leon features
  44   HasLeonCasa = false;
  45   HasUmacSmac = false;
  46   HasPWRPSR = false;
  47   InsertNOPLoad = false;
  48   FixAllFDIVSQRT = false;
  49   DetectRoundChange = false;
  50   HasLeonCycleCounter = false;
  51
  52   // Determine default and user specified characteristics
  53   std::string CPUName = CPU;
  54   if (CPUName.empty())
  55     CPUName = (Is64Bit) ? "v9" : "v8";
  56
  57   // Parse features string.
  58   ParseSubtargetFeatures(CPUName, FS);
  59
  60   // Popc is a v9-only instruction.
  61   if (!IsV9)
  62     UsePopc = false;
  63
  64   return *this;
  65 }
  66
  67 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
  68                                const std::string &FS, const TargetMachine &TM,
  69                                bool is64Bit)
  70     : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
  71       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
  72       FrameLowering(*this) {}
  73
  74 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
  75
  76   if (is64Bit()) {
  77     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
  78     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
  79     frameSize += 128;
  80     // Frames with calls must also reserve space for 6 outgoing arguments
  81     // whether they are used or not. LowerCall_64 takes care of that.
  82     frameSize = alignTo(frameSize, 16);
  83   } else {
  84     // Emit the correct save instruction based on the number of bytes in
  85     // the frame. Minimum stack frame size according to V8 ABI is:
  86     //   16 words for register window spill
  87     //    1 word for address of returned aggregate-value
  88     // +  6 words for passing parameters on the stack
  89     // ----------
  90     //   23 words * 4 bytes per word = 92 bytes
  91     frameSize += 92;
  92
  93     // Round up to next doubleword boundary -- a double-word boundary
  94     // is required by the ABI.
  95     frameSize = alignTo(frameSize, 8);
  96   }
  97   return frameSize;
  98 }
  99
 100 bool SparcSubtarget::enableMachineScheduler() const {
 101   return true;
 102 }