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 V8DeprecatedInsts = false; 33 IsVIS = false; 34 HasHardQuad = false; 35 UsePopc = false; 36 37 // Determine default and user specified characteristics 38 std::string CPUName = CPU; 39 if (CPUName.empty()) 40 CPUName = (Is64Bit) ? "v9" : "v8"; 41 42 // Parse features string. 43 ParseSubtargetFeatures(CPUName, FS); 44 45 // Popc is a v9-only instruction. 46 if (!IsV9) 47 UsePopc = false; 48 49 return *this; 50 } 51 52 SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU, 53 const std::string &FS, TargetMachine &TM, 54 bool is64Bit) 55 : SparcGenSubtargetInfo(TT, CPU, FS), Is64Bit(is64Bit), 56 InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this), 57 TSInfo(*TM.getDataLayout()), FrameLowering(*this) {} 58 59 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { 60 61 if (is64Bit()) { 62 // All 64-bit stack frames must be 16-byte aligned, and must reserve space 63 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. 64 frameSize += 128; 65 // Frames with calls must also reserve space for 6 outgoing arguments 66 // whether they are used or not. LowerCall_64 takes care of that. 67 assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned"); 68 } else { 69 // Emit the correct save instruction based on the number of bytes in 70 // the frame. Minimum stack frame size according to V8 ABI is: 71 // 16 words for register window spill 72 // 1 word for address of returned aggregate-value 73 // + 6 words for passing parameters on the stack 74 // ---------- 75 // 23 words * 4 bytes per word = 92 bytes 76 frameSize += 92; 77 78 // Round up to next doubleword boundary -- a double-word boundary 79 // is required by the ABI. 80 frameSize = RoundUpToAlignment(frameSize, 8); 81 } 82 return frameSize; 83 } 84
