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 IsVIS2 = false; 37 IsVIS3 = false; 38 HasHardQuad = false; 39 UsePopc = false; 40 UseSoftFloat = false; 41 HasNoFSMULD = false; 42 HasNoFMULS = false; 43 44 // Leon features 45 HasLeonCasa = false; 46 HasUmacSmac = false; 47 PerformSDIVReplace = false; 48 InsertNOPLoad = false; 49 FixAllFDIVSQRT = false; 50 DetectRoundChange = false; 51 52 // Determine default and user specified characteristics 53 std::string CPUName = 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