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
19using 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
27void SparcSubtarget::anchor() { }
28
29SparcSubtarget &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
52SparcSubtarget::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
59int 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
85bool SparcSubtarget::enableMachineScheduler() const {
86  return true;
87}
88