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