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      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   IsV9 = false;
     32   V8DeprecatedInsts = false;
     33   IsVIS = false;
     34   HasHardQuad = false;
     35   UsePopc = false;
     36 
     37   // Determine default and user specified characteristics
     38   std::string CPUName = CPU;
     39   if (CPUName.empty())
     40     CPUName = (Is64Bit) ? "v9" : "v8";
     41 
     42   // Parse features string.
     43   ParseSubtargetFeatures(CPUName, FS);
     44 
     45   // Popc is a v9-only instruction.
     46   if (!IsV9)
     47     UsePopc = false;
     48 
     49   return *this;
     50 }
     51 
     52 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
     53                                const std::string &FS, TargetMachine &TM,
     54                                bool is64Bit)
     55     : SparcGenSubtargetInfo(TT, CPU, FS), Is64Bit(is64Bit),
     56       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
     57       FrameLowering(*this) {}
     58 
     59 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
     60 
     61   if (is64Bit()) {
     62     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
     63     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
     64     frameSize += 128;
     65     // Frames with calls must also reserve space for 6 outgoing arguments
     66     // whether they are used or not. LowerCall_64 takes care of that.
     67     frameSize = RoundUpToAlignment(frameSize, 16);
     68   } else {
     69     // Emit the correct save instruction based on the number of bytes in
     70     // the frame. Minimum stack frame size according to V8 ABI is:
     71     //   16 words for register window spill
     72     //    1 word for address of returned aggregate-value
     73     // +  6 words for passing parameters on the stack
     74     // ----------
     75     //   23 words * 4 bytes per word = 92 bytes
     76     frameSize += 92;
     77 
     78     // Round up to next doubleword boundary -- a double-word boundary
     79     // is required by the ABI.
     80     frameSize = RoundUpToAlignment(frameSize, 8);
     81   }
     82   return frameSize;
     83 }
     84 
     85 bool SparcSubtarget::enableMachineScheduler() const {
     86   return true;
     87 }
     88