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 "SparcSelectionDAGInfo.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(CPU: 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 TSInfo = std::make_unique<SparcSelectionDAGInfo>();
58}
59
60SparcSubtarget::~SparcSubtarget() = default;
61
62const SelectionDAGTargetInfo *SparcSubtarget::getSelectionDAGInfo() const {
63 return TSInfo.get();
64}
65
66int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
67
68 if (is64Bit()) {
69 // All 64-bit stack frames must be 16-byte aligned, and must reserve space
70 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
71 frameSize += 128;
72 // Frames with calls must also reserve space for 6 outgoing arguments
73 // whether they are used or not. LowerCall_64 takes care of that.
74 frameSize = alignTo(Value: frameSize, Align: 16);
75 } else {
76 // Emit the correct save instruction based on the number of bytes in
77 // the frame. Minimum stack frame size according to V8 ABI is:
78 // 16 words for register window spill
79 // 1 word for address of returned aggregate-value
80 // + 6 words for passing parameters on the stack
81 // ----------
82 // 23 words * 4 bytes per word = 92 bytes
83 frameSize += 92;
84
85 // Round up to next doubleword boundary -- a double-word boundary
86 // is required by the ABI.
87 frameSize = alignTo(Value: frameSize, Align: 8);
88 }
89 return frameSize;
90}
91
92bool SparcSubtarget::enableMachineScheduler() const {
93 return true;
94}
95