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 FixCallImmediates = false; 44 IgnoreZeroFlag = false; 45 InsertNOPDoublePrecision = false; 46 FixFSMULD = false; 47 ReplaceFMULS = false; 48 PreventRoundChange = false; 49 FixAllFDIVSQRT = false; 50 InsertNOPLoad = false; 51 InsertNOPsLoadStore = false; 52 53 // Determine default and user specified characteristics 54 std::string CPUName = CPU; 55 if (CPUName.empty()) 56 CPUName = (Is64Bit) ? "v9" : "v8"; 57 58 // Parse features string. 59 ParseSubtargetFeatures(CPUName, FS); 60 61 // Popc is a v9-only instruction. 62 if (!IsV9) 63 UsePopc = false; 64 65 return *this; 66 } 67 68 SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU, 69 const std::string &FS, const TargetMachine &TM, 70 bool is64Bit) 71 : SparcGenSubtargetInfo(TT, CPU, FS), TargetTriple(TT), Is64Bit(is64Bit), 72 InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this), 73 FrameLowering(*this) {} 74 75 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { 76 77 if (is64Bit()) { 78 // All 64-bit stack frames must be 16-byte aligned, and must reserve space 79 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. 80 frameSize += 128; 81 // Frames with calls must also reserve space for 6 outgoing arguments 82 // whether they are used or not. LowerCall_64 takes care of that. 83 frameSize = alignTo(frameSize, 16); 84 } else { 85 // Emit the correct save instruction based on the number of bytes in 86 // the frame. Minimum stack frame size according to V8 ABI is: 87 // 16 words for register window spill 88 // 1 word for address of returned aggregate-value 89 // + 6 words for passing parameters on the stack 90 // ---------- 91 // 23 words * 4 bytes per word = 92 bytes 92 frameSize += 92; 93 94 // Round up to next doubleword boundary -- a double-word boundary 95 // is required by the ABI. 96 frameSize = alignTo(frameSize, 8); 97 } 98 return frameSize; 99 } 100 101 bool SparcSubtarget::enableMachineScheduler() const { 102 return true; 103 } 104