ARMSubtarget.cpp revision 54fc124d72512d65d62565cabcd85c7b07496513
1a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===-- ARMSubtarget.cpp - ARM Subtarget Information ------------*- C++ -*-===// 2a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 3a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// The LLVM Compiler Infrastructure 4a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 8a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===// 9a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 10a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// This file implements the ARM specific subclass of TargetSubtarget. 11a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 12a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===// 13a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 14a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "ARMSubtarget.h" 15a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "ARMGenSubtarget.inc" 16a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "llvm/Module.h" 170eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov#include "llvm/Target/TargetMachine.h" 180eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov#include "llvm/Target/TargetOptions.h" 1954fc124d72512d65d62565cabcd85c7b07496513Bob Wilson#include "llvm/Support/CommandLine.h" 20a8e2989ece6dc46df59b0768184028257f913843Evan Chengusing namespace llvm; 21a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 2254fc124d72512d65d62565cabcd85c7b07496513Bob Wilsonstatic cl::opt<bool> 2354fc124d72512d65d62565cabcd85c7b07496513Bob WilsonReserveR9("arm-reserve-r9", cl::Hidden, 2454fc124d72512d65d62565cabcd85c7b07496513Bob Wilson cl::desc("Reserve R9, making it unavailable as GPR")); 2554fc124d72512d65d62565cabcd85c7b07496513Bob Wilson 26d4022c3fbb0705abdc8eddc3ee4a5059f5ef8094Anton KorobeynikovARMSubtarget::ARMSubtarget(const Module &M, const std::string &FS, 27d4022c3fbb0705abdc8eddc3ee4a5059f5ef8094Anton Korobeynikov bool isThumb) 281a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng : ARMArchVersion(V4T) 296d7d2aa38a247426e2ccf53e3c6ad0315c9a4d8cAnton Korobeynikov , ARMFPUType(None) 3070459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov , IsThumb(isThumb) 3170459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov , ThumbMode(Thumb1) 3254fc124d72512d65d62565cabcd85c7b07496513Bob Wilson , IsR9Reserved(ReserveR9) 333630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , stackAlignment(4) 3441a024385f1220eadc48b48cb4c044a5fbc1b361Anton Korobeynikov , CPUString("generic") 353630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , TargetType(isELF) // Default to ELF unless otherwise specified. 363630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , TargetABI(ARM_ABI_APCS) { 370eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov // default to soft float ABI 380eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov if (FloatABIType == FloatABI::Default) 390eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov FloatABIType = FloatABI::Soft; 400eebf653a7b2978e7761f8d068b6fbec22aea0f6Anton Korobeynikov 41a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Determine default and user specified characteristics 42a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 43a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Parse features string. 4441a024385f1220eadc48b48cb4c044a5fbc1b361Anton Korobeynikov CPUString = ParseSubtargetFeatures(FS, CPUString); 45a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 46a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Set the boolean corresponding to the current target triple, or the default 47a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // if one cannot be determined, to true. 48a8e2989ece6dc46df59b0768184028257f913843Evan Cheng const std::string& TT = M.getTargetTriple(); 494b1747430a2d67702958b95d6776396734f184a0Evan Cheng unsigned Len = TT.length(); 508c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng unsigned Idx = 0; 51d4022c3fbb0705abdc8eddc3ee4a5059f5ef8094Anton Korobeynikov 528c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (Len >= 5 && TT.substr(0, 4) == "armv") 538c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng Idx = 4; 548c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng else if (Len >= 6 && TT.substr(0, 6) == "thumb") { 5570459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov IsThumb = true; 568c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (Len >= 7 && TT[5] == 'v') 578c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng Idx = 6; 588c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng } 598c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (Idx) { 608c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng unsigned SubVer = TT[Idx]; 618c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (SubVer > '4' && SubVer <= '9') { 6270459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov if (SubVer >= '7') 63d4022c3fbb0705abdc8eddc3ee4a5059f5ef8094Anton Korobeynikov ARMArchVersion = V7A; 6470459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov else if (SubVer == '6') 658c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng ARMArchVersion = V6; 6670459bef9ccd73b3a2a44fdd62f2509861112745Anton Korobeynikov else if (SubVer == '5') { 678c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng ARMArchVersion = V5T; 688c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (Len >= Idx+3 && TT[Idx+1] == 't' && TT[Idx+2] == 'e') 698c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng ARMArchVersion = V5TE; 704b1747430a2d67702958b95d6776396734f184a0Evan Cheng } 714b1747430a2d67702958b95d6776396734f184a0Evan Cheng } 724b1747430a2d67702958b95d6776396734f184a0Evan Cheng } 734b1747430a2d67702958b95d6776396734f184a0Evan Cheng 748c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng if (Len >= 10) { 751a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng if (TT.find("-darwin") != std::string::npos) 768c6b991635ff589fbe4b8db013bcc1d2ef57a0e0Evan Cheng // arm-darwin 771a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng TargetType = isDarwin; 78a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } else if (TT.empty()) { 79a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#if defined(__APPLE__) 801a3771e30e48b9cc21ccdc79fc9cf37ec4104b17Evan Cheng TargetType = isDarwin; 81a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#endif 82a8e2989ece6dc46df59b0768184028257f913843Evan Cheng } 83a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 843630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio if (TT.find("eabi") != std::string::npos) 853630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio TargetABI = ARM_ABI_AAPCS; 863630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio 873630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio if (isAAPCS_ABI()) 883630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio stackAlignment = 8; 893630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio 90cd828618b8c6ec58df94aec0f5546f009f2fd0d5Evan Cheng if (isTargetDarwin()) 9154fc124d72512d65d62565cabcd85c7b07496513Bob Wilson IsR9Reserved = ReserveR9 | (ARMArchVersion < V6); 92a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 93