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