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
anchor()27 void SparcSubtarget::anchor() { }
28
initializeSubtargetDependencies(StringRef CPU,StringRef FS)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
SparcSubtarget(const Triple & TT,const std::string & CPU,const std::string & FS,TargetMachine & TM,bool is64Bit)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
getAdjustedFrameSize(int frameSize) const59 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
enableMachineScheduler() const85 bool SparcSubtarget::enableMachineScheduler() const {
86 return true;
87 }
88