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/ADT/StringRef.h" 16 #include "llvm/MC/TargetRegistry.h" 17 #include "llvm/Support/MathExtras.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( 30 StringRef CPU, StringRef TuneCPU, StringRef FS) { 31 // Determine default and user specified characteristics 32 std::string CPUName = std::string(CPU); 33 if (CPUName.empty()) 34 CPUName = (Is64Bit) ? "v9" : "v8"; 35 36 if (TuneCPU.empty()) 37 TuneCPU = CPUName; 38 39 // Parse features string. 40 ParseSubtargetFeatures(CPUName, TuneCPU, FS); 41 42 // Popc is a v9-only instruction. 43 if (!IsV9) 44 UsePopc = false; 45 46 return *this; 47 } 48 49 SparcSubtarget::SparcSubtarget(const StringRef &CPU, const StringRef &TuneCPU, 50 const StringRef &FS, const TargetMachine &TM, 51 bool is64Bit) 52 : SparcGenSubtargetInfo(TM.getTargetTriple(), CPU, TuneCPU, FS), 53 ReserveRegister(TM.getMCRegisterInfo()->getNumRegs()), 54 TargetTriple(TM.getTargetTriple()), Is64Bit(is64Bit), 55 InstrInfo(initializeSubtargetDependencies(CPU, TuneCPU, FS)), 56 TLInfo(TM, *this), FrameLowering(*this) {} 57 58 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { 59 60 if (is64Bit()) { 61 // All 64-bit stack frames must be 16-byte aligned, and must reserve space 62 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. 63 frameSize += 128; 64 // Frames with calls must also reserve space for 6 outgoing arguments 65 // whether they are used or not. LowerCall_64 takes care of that. 66 frameSize = alignTo(frameSize, 16); 67 } else { 68 // Emit the correct save instruction based on the number of bytes in 69 // the frame. Minimum stack frame size according to V8 ABI is: 70 // 16 words for register window spill 71 // 1 word for address of returned aggregate-value 72 // + 6 words for passing parameters on the stack 73 // ---------- 74 // 23 words * 4 bytes per word = 92 bytes 75 frameSize += 92; 76 77 // Round up to next doubleword boundary -- a double-word boundary 78 // is required by the ABI. 79 frameSize = alignTo(frameSize, 8); 80 } 81 return frameSize; 82 } 83 84 bool SparcSubtarget::enableMachineScheduler() const { 85 return true; 86 } 87