1 //===-- SparcSubtarget.cpp - SPARC Subtarget Information ------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements the SPARC specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "SparcSubtarget.h"
14 #include "Sparc.h"
15 #include "llvm/Support/MathExtras.h"
16 #include "llvm/Support/TargetRegistry.h"
17 
18 using namespace llvm;
19 
20 #define DEBUG_TYPE "sparc-subtarget"
21 
22 #define GET_SUBTARGETINFO_TARGET_DESC
23 #define GET_SUBTARGETINFO_CTOR
24 #include "SparcGenSubtargetInfo.inc"
25 
26 void SparcSubtarget::anchor() { }
27 
28 SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(StringRef CPU,
29                                                                 StringRef FS) {
30   UseSoftMulDiv = false;
31   IsV9 = false;
32   IsLeon = false;
33   V8DeprecatedInsts = false;
34   IsVIS = false;
35   IsVIS2 = false;
36   IsVIS3 = false;
37   HasHardQuad = false;
38   UsePopc = false;
39   UseSoftFloat = false;
40   HasNoFSMULD = false;
41   HasNoFMULS = false;
42 
43   // Leon features
44   HasLeonCasa = false;
45   HasUmacSmac = false;
46   HasPWRPSR = false;
47   InsertNOPLoad = false;
48   FixAllFDIVSQRT = false;
49   DetectRoundChange = false;
50   HasLeonCycleCounter = false;
51 
52   // Determine default and user specified characteristics
53   std::string CPUName = std::string(CPU);
54   if (CPUName.empty())
55     CPUName = (Is64Bit) ? "v9" : "v8";
56 
57   // Parse features string.
58   ParseSubtargetFeatures(CPUName, FS);
59 
60   // Popc is a v9-only instruction.
61   if (!IsV9)
62     UsePopc = false;
63 
64   return *this;
65 }
66 
67 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
68                                const std::string &FS, const TargetMachine &TM,
69                                bool is64Bit)
70     : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit),
71       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
72       FrameLowering(*this) {}
73 
74 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
75 
76   if (is64Bit()) {
77     // All 64-bit stack frames must be 16-byte aligned, and must reserve space
78     // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
79     frameSize += 128;
80     // Frames with calls must also reserve space for 6 outgoing arguments
81     // whether they are used or not. LowerCall_64 takes care of that.
82     frameSize = alignTo(frameSize, 16);
83   } else {
84     // Emit the correct save instruction based on the number of bytes in
85     // the frame. Minimum stack frame size according to V8 ABI is:
86     //   16 words for register window spill
87     //    1 word for address of returned aggregate-value
88     // +  6 words for passing parameters on the stack
89     // ----------
90     //   23 words * 4 bytes per word = 92 bytes
91     frameSize += 92;
92 
93     // Round up to next doubleword boundary -- a double-word boundary
94     // is required by the ABI.
95     frameSize = alignTo(frameSize, 8);
96   }
97   return frameSize;
98 }
99 
100 bool SparcSubtarget::enableMachineScheduler() const {
101   return true;
102 }
103