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/MC/TargetRegistry.h" 16 #include "llvm/Support/MathExtras.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, /*TuneCPU*/ 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, /*TuneCPU*/ CPU, FS), TargetTriple(TT), 71 Is64Bit(is64Bit), InstrInfo(initializeSubtargetDependencies(CPU, FS)), 72 TLInfo(TM, *this), 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