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