LLVM  4.0.0
SparcSubtarget.cpp
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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"
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 
30  StringRef FS) {
31  IsV9 = false;
32  IsLeon = false;
33  V8DeprecatedInsts = false;
34  IsVIS = false;
35  HasHardQuad = false;
36  UsePopc = false;
37  UseSoftFloat = false;
38 
39  // Leon features
40  HasLeonCasa = false;
41  HasUmacSmac = false;
42  PerformSDIVReplace = false;
43  InsertNOPLoad = false;
44  FixFSMULD = false;
45  ReplaceFMULS = false;
46  FixAllFDIVSQRT = false;
47  DetectRoundChange = false;
48 
49  // Determine default and user specified characteristics
50  std::string CPUName = CPU;
51  if (CPUName.empty())
52  CPUName = (Is64Bit) ? "v9" : "v8";
53 
54  // Parse features string.
55  ParseSubtargetFeatures(CPUName, FS);
56 
57  // Popc is a v9-only instruction.
58  if (!IsV9)
59  UsePopc = false;
60 
61  return *this;
62 }
63 
64 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
65  const std::string &FS, const TargetMachine &TM,
66  bool is64Bit)
67  : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
68  InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
69  FrameLowering(*this) {}
70 
71 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
72 
73  if (is64Bit()) {
74  // All 64-bit stack frames must be 16-byte aligned, and must reserve space
75  // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
76  frameSize += 128;
77  // Frames with calls must also reserve space for 6 outgoing arguments
78  // whether they are used or not. LowerCall_64 takes care of that.
79  frameSize = alignTo(frameSize, 16);
80  } else {
81  // Emit the correct save instruction based on the number of bytes in
82  // the frame. Minimum stack frame size according to V8 ABI is:
83  // 16 words for register window spill
84  // 1 word for address of returned aggregate-value
85  // + 6 words for passing parameters on the stack
86  // ----------
87  // 23 words * 4 bytes per word = 92 bytes
88  frameSize += 92;
89 
90  // Round up to next doubleword boundary -- a double-word boundary
91  // is required by the ABI.
92  frameSize = alignTo(frameSize, 8);
93  }
94  return frameSize;
95 }
96 
98  return true;
99 }
SparcSubtarget & initializeSubtargetDependencies(StringRef CPU, StringRef FS)
SparcSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS, const TargetMachine &TM, bool is64bit)
uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew=0)
Returns the next integer (mod 2**64) that is greater than or equal to Value and is a multiple of Alig...
Definition: MathExtras.h:664
bool enableMachineScheduler() const override
static bool is64Bit(const char *name)
void ParseSubtargetFeatures(StringRef CPU, StringRef FS)
ParseSubtargetFeatures - Parses features string setting specified subtarget options.
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
int getAdjustedFrameSize(int stackSize) const
Given a actual stack size as determined by FrameInfo, this function returns adjusted framesize which ...
bool is64Bit() const
Primary interface to the complete machine description for the target machine.
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:47