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 
27 void SparcSubtarget::anchor() { }
28 
29 SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(StringRef CPU,
30                                                                 StringRef FS) {
31   UseSoftMulDiv = false;
32   IsV9 = false;
33   IsLeon = false;
34   V8DeprecatedInsts = false;
35   IsVIS = false;
36   IsVIS2 = false;
37   IsVIS3 = false;
38   HasHardQuad = false;
39   UsePopc = false;
40   UseSoftFloat = false;
41   HasNoFSMULD = false;
42   HasNoFMULS = false;
43 
44   // Leon features
45   HasLeonCasa = false;
46   HasUmacSmac = false;
47   InsertNOPLoad = false;
48   FixAllFDIVSQRT = false;
49   DetectRoundChange = false;
50 
51   // Determine default and user specified characteristics
52   std::string CPUName = CPU;
53   if (CPUName.empty())
54     CPUName = (Is64Bit) ? "v9" : "v8";
55 
56   // Parse features string.
57   ParseSubtargetFeatures(CPUName, FS);
58 
59   // Popc is a v9-only instruction.
60   if (!IsV9)
61     UsePopc = false;
62 
63   return *this;
64 }
65 
66 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
67                                const std::string &FS, const TargetMachine &TM,
68                                bool is64Bit)
69     : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
70       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
71       FrameLowering(*this) {}
72 
73 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
74 
75   if (is64Bit()) {
76     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
77     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
78     frameSize += 128;
79     // Frames with calls must also reserve space for 6 outgoing arguments
80     // whether they are used or not. LowerCall_64 takes care of that.
81     frameSize = alignTo(frameSize, 16);
82   } else {
83     // Emit the correct save instruction based on the number of bytes in
84     // the frame. Minimum stack frame size according to V8 ABI is:
85     //   16 words for register window spill
86     //    1 word for address of returned aggregate-value
87     // +  6 words for passing parameters on the stack
88     // ----------
89     //   23 words * 4 bytes per word = 92 bytes
90     frameSize += 92;
91 
92     // Round up to next doubleword boundary -- a double-word boundary
93     // is required by the ABI.
94     frameSize = alignTo(frameSize, 8);
95   }
96   return frameSize;
97 }
98 
99 bool SparcSubtarget::enableMachineScheduler() const {
100   return true;
101 }
102