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 #define GET_SUBTARGETINFO_TARGET_DESC 20 #define GET_SUBTARGETINFO_CTOR 21 #include "SparcGenSubtargetInfo.inc" 22 23 using namespace llvm; 24 25 void SparcSubtarget::anchor() { } 26 27 SparcSubtarget::SparcSubtarget(const std::string &TT, const std::string &CPU, 28 const std::string &FS, bool is64Bit) : 29 SparcGenSubtargetInfo(TT, CPU, FS), 30 IsV9(false), 31 V8DeprecatedInsts(false), 32 IsVIS(false), 33 Is64Bit(is64Bit) { 34 35 // Determine default and user specified characteristics 36 std::string CPUName = CPU; 37 if (CPUName.empty()) { 38 if (is64Bit) 39 CPUName = "v9"; 40 else 41 CPUName = "v8"; 42 } 43 IsV9 = CPUName == "v9"; 44 45 // Parse features string. 46 ParseSubtargetFeatures(CPUName, FS); 47 } 48 49 50 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { 51 52 if (is64Bit()) { 53 // All 64-bit stack frames must be 16-byte aligned, and must reserve space 54 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. 55 frameSize += 128; 56 // Frames with calls must also reserve space for 6 outgoing arguments 57 // whether they are used or not. LowerCall_64 takes care of that. 58 assert(frameSize % 16 == 0 && "Stack size not 16-byte aligned"); 59 } else { 60 // Emit the correct save instruction based on the number of bytes in 61 // the frame. Minimum stack frame size according to V8 ABI is: 62 // 16 words for register window spill 63 // 1 word for address of returned aggregate-value 64 // + 6 words for passing parameters on the stack 65 // ---------- 66 // 23 words * 4 bytes per word = 92 bytes 67 frameSize += 92; 68 69 // Round up to next doubleword boundary -- a double-word boundary 70 // is required by the ABI. 71 frameSize = RoundUpToAlignment(frameSize, 8); 72 } 73 return frameSize; 74 } 75
