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   InsertNOPLoad = false;
43 
44   // Determine default and user specified characteristics
45   std::string CPUName = CPU;
46   if (CPUName.empty())
47     CPUName = (Is64Bit) ? "v9" : "v8";
48 
49   // Parse features string.
50   ParseSubtargetFeatures(CPUName, FS);
51 
52   // Popc is a v9-only instruction.
53   if (!IsV9)
54     UsePopc = false;
55 
56   return *this;
57 }
58 
59 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
60                                const std::string &FS, const TargetMachine &TM,
61                                bool is64Bit)
62     : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
63       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
64       FrameLowering(*this) {}
65 
66 int 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(frameSize, 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(frameSize, 8);
88   }
89   return frameSize;
90 }
91 
92 bool SparcSubtarget::enableMachineScheduler() const {
93   return true;
94 }
95