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