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 "llvm/ADT/StringRef.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( 29 StringRef CPU, StringRef TuneCPU, StringRef FS) { 30 // Determine default and user specified characteristics 31 std::string CPUName = std::string(CPU); 32 if (CPUName.empty()) 33 CPUName = (Is64Bit) ? "v9" : "v8"; 34 35 if (TuneCPU.empty()) 36 TuneCPU = CPUName; 37 38 // Parse features string. 39 ParseSubtargetFeatures(CPUName, TuneCPU, FS); 40 41 // Popc is a v9-only instruction. 42 if (!IsV9) 43 UsePopc = false; 44 45 return *this; 46 } 47 48 SparcSubtarget::SparcSubtarget(const StringRef &CPU, const StringRef &TuneCPU, 49 const StringRef &FS, const TargetMachine &TM, 50 bool is64Bit) 51 : SparcGenSubtargetInfo(TM.getTargetTriple(), CPU, TuneCPU, FS), 52 ReserveRegister(TM.getMCRegisterInfo()->getNumRegs()), 53 TargetTriple(TM.getTargetTriple()), Is64Bit(is64Bit), 54 InstrInfo(initializeSubtargetDependencies(CPU, TuneCPU, FS)), 55 TLInfo(TM, *this), FrameLowering(*this) {} 56 57 int SparcSubtarget::getAdjustedFrameSize(int frameSize) const { 58 59 if (is64Bit()) { 60 // All 64-bit stack frames must be 16-byte aligned, and must reserve space 61 // for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128. 62 frameSize += 128; 63 // Frames with calls must also reserve space for 6 outgoing arguments 64 // whether they are used or not. LowerCall_64 takes care of that. 65 frameSize = alignTo(frameSize, 16); 66 } else { 67 // Emit the correct save instruction based on the number of bytes in 68 // the frame. Minimum stack frame size according to V8 ABI is: 69 // 16 words for register window spill 70 // 1 word for address of returned aggregate-value 71 // + 6 words for passing parameters on the stack 72 // ---------- 73 // 23 words * 4 bytes per word = 92 bytes 74 frameSize += 92; 75 76 // Round up to next doubleword boundary -- a double-word boundary 77 // is required by the ABI. 78 frameSize = alignTo(frameSize, 8); 79 } 80 return frameSize; 81 } 82 83 bool SparcSubtarget::enableMachineScheduler() const { 84 return true; 85 } 86