ARMSubtarget.cpp revision eb1641d54a7eda7717304bc4d55d059208d8ebed
131d157ae1ac2cd9c787dc3c1d28e64c682803844Jia Liu//===-- ARMSubtarget.cpp - ARM Subtarget Information ----------------------===// 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// 105b1b4489cf3a0f56f8be0673fc5cc380a32d277bEvan Cheng// This file implements the ARM specific subclass of TargetSubtargetInfo. 11a8e2989ece6dc46df59b0768184028257f913843Evan Cheng// 12a8e2989ece6dc46df59b0768184028257f913843Evan Cheng//===----------------------------------------------------------------------===// 13a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 14a8e2989ece6dc46df59b0768184028257f913843Evan Cheng#include "ARMSubtarget.h" 15b72d2a92b75daa9cbac7338aff0cd8ae04c2b4bdEvan Cheng#include "ARMBaseRegisterInfo.h" 16e127dfd0b175b5a336e61fecaad7fc2aec65d95cAndrew Trick#include "ARMBaseInstrInfo.h" 17e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng#include "llvm/GlobalValue.h" 18e127dfd0b175b5a336e61fecaad7fc2aec65d95cAndrew Trick#include "llvm/Target/TargetInstrInfo.h" 1954fc124d72512d65d62565cabcd85c7b07496513Bob Wilson#include "llvm/Support/CommandLine.h" 2094214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 2194214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng#define GET_SUBTARGETINFO_TARGET_DESC 22ebdeeab812beec0385b445f3d4c41a114e0d972fEvan Cheng#define GET_SUBTARGETINFO_CTOR 23385e930d55f3ecd3c9538823dfa5896a12461845Evan Cheng#include "ARMGenSubtargetInfo.inc" 2494214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 25a8e2989ece6dc46df59b0768184028257f913843Evan Chengusing namespace llvm; 26a8e2989ece6dc46df59b0768184028257f913843Evan Cheng 2754fc124d72512d65d62565cabcd85c7b07496513Bob Wilsonstatic cl::opt<bool> 2854fc124d72512d65d62565cabcd85c7b07496513Bob WilsonReserveR9("arm-reserve-r9", cl::Hidden, 2954fc124d72512d65d62565cabcd85c7b07496513Bob Wilson cl::desc("Reserve R9, making it unavailable as GPR")); 3054fc124d72512d65d62565cabcd85c7b07496513Bob Wilson 315cdc3a949af0cef7f2163f8a7acbf3049c226321Anton Korobeynikovstatic cl::opt<bool> 3253519f015e3e84e9f57b677cc8724805a6009b73Evan ChengDarwinUseMOVT("arm-darwin-use-movt", cl::init(true), cl::Hidden); 335cdc3a949af0cef7f2163f8a7acbf3049c226321Anton Korobeynikov 3402aba73a9ec04d0de9424422249af3948ca9573aBob Wilsonstatic cl::opt<bool> 35eb1641d54a7eda7717304bc4d55d059208d8ebedBob WilsonUseFusedMulOps("arm-use-mulops", 36eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson cl::init(true), cl::Hidden); 37eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson 38eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilsonstatic cl::opt<bool> 3902aba73a9ec04d0de9424422249af3948ca9573aBob WilsonStrictAlign("arm-strict-align", cl::Hidden, 4002aba73a9ec04d0de9424422249af3948ca9573aBob Wilson cl::desc("Disallow all unaligned memory accesses")); 4102aba73a9ec04d0de9424422249af3948ca9573aBob Wilson 42276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan ChengARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU, 4394ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng const std::string &FS) 440ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng : ARMGenSubtargetInfo(TT, CPU, FS) 453ef1c8759a20167457eb7fd82ebcaffe7ccaa1d1Evan Cheng , ARMProcFamily(Others) 4639dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV4TOps(false) 4739dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV5TOps(false) 4839dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV5TEOps(false) 4939dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV6Ops(false) 5039dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV6T2Ops(false) 5139dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasV7Ops(false) 5239dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasVFPv2(false) 5339dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasVFPv3(false) 544b4e62219be91839091f9e35d8accf877f925d81Anton Korobeynikov , HasVFPv4(false) 5539dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng , HasNEON(false) 567ec7a0e96b34fedf11445c1dde27a4fac8e8a1a7Jim Grosbach , UseNEONForSinglePrecisionFP(false) 57eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson , UseMulOps(UseFusedMulOps) 5848575f6ea7d5cd21ab29ca370f58fcf9ca31400bEvan Cheng , SlowFPVMLx(false) 590e3ee43ea058a35ab5ce69cceafd316d49eaad34Benjamin Kramer , HasVMLxForwarding(false) 609de1ac267e197d40cec7a14041f2bf69498536c9Evan Cheng , SlowFPBrcc(false) 61963b03c1a9f6a9742671459f103ee9a566c6de58Evan Cheng , InThumbMode(false) 6294ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng , HasThumb2(false) 63acad68da50581de905a994ed3c6b9c197bcea687James Molloy , IsMClass(false) 647b4d31176efe6894bcfaa05257dd5783acda5ddcEvan Cheng , NoARM(false) 650dad89fa94536284d51f60868326294b725a0c61David Goodwin , PostRAScheduler(false) 6654fc124d72512d65d62565cabcd85c7b07496513Bob Wilson , IsR9Reserved(ReserveR9) 675de5d4b6d0eb3fd379fa571d82f6fa764460b3b8Evan Cheng , UseMovt(false) 686d2f9cec715c50bca44816d9bdea97f8b63bf2a0Bob Wilson , SupportsTailCall(false) 69631379e79c0971c5bac13629b8caf8912ed4c35cAnton Korobeynikov , HasFP16(false) 7077f42b52781b6923924a93b8ab338d183887a592Bob Wilson , HasD16(false) 7129402132f3e890a2771818f44987ede213297431Jim Grosbach , HasHardwareDivide(false) 72eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson , HasHardwareDivideInARM(false) 7329402132f3e890a2771818f44987ede213297431Jim Grosbach , HasT2ExtractPack(false) 7411db068721d44fd5f9b0c2a3a4c90f813d2eae9cEvan Cheng , HasDataBarrier(false) 759de1ac267e197d40cec7a14041f2bf69498536c9Evan Cheng , Pref32BitThumb(false) 765dde893c2bac9e1569c38429f756c1d723e8edf2Bob Wilson , AvoidCPSRPartialUpdate(false) 77bfae1fd1fce97e73299e8ad67a22ae18de5112e9Benjamin Kramer , HasRAS(false) 78dfed19fe2c34c1209108afa58e8ab014ffd894e2Evan Cheng , HasMPExtension(false) 79fcba5e6b645df89ae6b93911fe0f80b08fa6b44cJim Grosbach , FPOnlySP(false) 8002aba73a9ec04d0de9424422249af3948ca9573aBob Wilson , AllowsUnalignedMem(false) 81a7603982dbf9e240ecc7ed6eddcd1cdb868107acJim Grosbach , Thumb2DSP(false) 823630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , stackAlignment(4) 83276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan Cheng , CPUString(CPU) 84b72d2a92b75daa9cbac7338aff0cd8ae04c2b4bdEvan Cheng , TargetTriple(TT) 853630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , TargetABI(ARM_ABI_APCS) { 86a8e2989ece6dc46df59b0768184028257f913843Evan Cheng // Determine default and user specified characteristics 87276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan Cheng if (CPUString.empty()) 88276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan Cheng CPUString = "generic"; 894b1747430a2d67702958b95d6776396734f184a0Evan Cheng 904cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // Insert the architecture feature derived from the target triple into the 914cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // feature string. This is important for setting features that are implied 924cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // based on the architecture version. 93e67a4163f5d2ad8e42a3aa0ccdaa27d85f6d5be4Evan Cheng std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPUString); 9494ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng if (!FS.empty()) { 9594ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng if (!ArchFS.empty()) 9694ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng ArchFS = ArchFS + "," + FS; 9794ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng else 9894ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng ArchFS = FS; 9994ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng } 1000ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng ParseSubtargetFeatures(CPUString, ArchFS); 10194ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng 10294ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng // Thumb2 implies at least V6T2. FIXME: Fix tests to explicitly specify a 10394ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng // ARM version or CPU and then remove this. 10439dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng if (!HasV6T2Ops && hasThumb2()) 10539dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng HasV4TOps = HasV5TOps = HasV5TEOps = HasV6Ops = HasV6T2Ops = true; 10666f6c79450a93d979128d8702c83841c8f715dc8Bob Wilson 107d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick // Keep a pointer to static instruction cost data for the specified CPU. 108d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick SchedModel = getSchedModelForCPU(CPUString); 109d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick 11094214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng // Initialize scheduling itinerary for the specified CPU. 11194214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng InstrItins = getInstrItineraryForCPU(CPUString); 11294214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 113afb3b5ebe61b480527de86311d2a0770fc857d38Evan Cheng if ((TT.find("eabi") != std::string::npos) || (isTargetIOS() && isMClass())) 11407043279f60622243d16d8a3f60805960482083cEvan Cheng // FIXME: We might want to separate AAPCS and EABI. Some systems, e.g. 11507043279f60622243d16d8a3f60805960482083cEvan Cheng // Darwin-EABI conforms to AACPS but not the rest of EABI. 1160ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng TargetABI = ARM_ABI_AAPCS; 1170ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng 1183630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio if (isAAPCS_ABI()) 1193630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio stackAlignment = 8; 1203630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio 121afff941211526a31f931aa9fcac84ae42ff60ef0Evan Cheng if (!isTargetIOS()) 1225de5d4b6d0eb3fd379fa571d82f6fa764460b3b8Evan Cheng UseMovt = hasV6T2Ops(); 1235de5d4b6d0eb3fd379fa571d82f6fa764460b3b8Evan Cheng else { 12439dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng IsR9Reserved = ReserveR9 | !HasV6Ops; 12553519f015e3e84e9f57b677cc8724805a6009b73Evan Cheng UseMovt = DarwinUseMOVT && hasV6T2Ops(); 12607043279f60622243d16d8a3f60805960482083cEvan Cheng SupportsTailCall = !getTargetTriple().isOSVersionLT(5, 0); 1275de5d4b6d0eb3fd379fa571d82f6fa764460b3b8Evan Cheng } 128471850ab84301dd47cab2bf8d694fcb5766c1169David Goodwin 129d3dd50fec00fbbb76edbfaff4d613f1248d21c9eEvan Cheng if (!isThumb() || hasThumb2()) 130d3dd50fec00fbbb76edbfaff4d613f1248d21c9eEvan Cheng PostRAScheduler = true; 13102aba73a9ec04d0de9424422249af3948ca9573aBob Wilson 13202aba73a9ec04d0de9424422249af3948ca9573aBob Wilson // v6+ may or may not support unaligned mem access depending on the system 13302aba73a9ec04d0de9424422249af3948ca9573aBob Wilson // configuration. 13402aba73a9ec04d0de9424422249af3948ca9573aBob Wilson if (!StrictAlign && hasV6Ops() && isTargetDarwin()) 13502aba73a9ec04d0de9424422249af3948ca9573aBob Wilson AllowsUnalignedMem = true; 136a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 137e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng 138e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol. 13963476a80404125e5196b6c09113c1d4796da0604Evan Chengbool 14046510a73e977273ec67747eb34cbdb43f815e451Dan GohmanARMSubtarget::GVIsIndirectSymbol(const GlobalValue *GV, 14146510a73e977273ec67747eb34cbdb43f815e451Dan Gohman Reloc::Model RelocM) const { 14263476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (RelocM == Reloc::Static) 143e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng return false; 14463476a80404125e5196b6c09113c1d4796da0604Evan Cheng 145f0356fe140af1a30587b9a86bcfb1b2c51b8ce20Jeffrey Yasskin // Materializable GVs (in JIT lazy compilation mode) do not require an extra 146f0356fe140af1a30587b9a86bcfb1b2c51b8ce20Jeffrey Yasskin // load from stub. 147af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng bool isDecl = GV->hasAvailableExternallyLinkage(); 148af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng if (GV->isDeclaration() && !GV->isMaterializable()) 149af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng isDecl = true; 15063476a80404125e5196b6c09113c1d4796da0604Evan Cheng 15163476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!isTargetDarwin()) { 15263476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Extra load is needed for all externally visible. 15363476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (GV->hasLocalLinkage() || GV->hasHiddenVisibility()) 15463476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 15563476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 15663476a80404125e5196b6c09113c1d4796da0604Evan Cheng } else { 15763476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (RelocM == Reloc::PIC_) { 15863476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If this is a strong reference to a definition, it is definitely not 15963476a80404125e5196b6c09113c1d4796da0604Evan Cheng // through a stub. 16063476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!isDecl && !GV->isWeakForLinker()) 16163476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 16263476a80404125e5196b6c09113c1d4796da0604Evan Cheng 16363476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Unless we have a symbol with hidden visibility, we have to go through a 16463476a80404125e5196b6c09113c1d4796da0604Evan Cheng // normal $non_lazy_ptr stub because this symbol might be resolved late. 16563476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. 16663476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 16763476a80404125e5196b6c09113c1d4796da0604Evan Cheng 16863476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If symbol visibility is hidden, we have a stub for common symbol 16963476a80404125e5196b6c09113c1d4796da0604Evan Cheng // references and external declarations. 17063476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (isDecl || GV->hasCommonLinkage()) 17163476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Hidden $non_lazy_ptr reference. 17263476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 17363476a80404125e5196b6c09113c1d4796da0604Evan Cheng 17463476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 17563476a80404125e5196b6c09113c1d4796da0604Evan Cheng } else { 17663476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If this is a strong reference to a definition, it is definitely not 17763476a80404125e5196b6c09113c1d4796da0604Evan Cheng // through a stub. 17863476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!isDecl && !GV->isWeakForLinker()) 17963476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 1806e8f4c404825b79f9b9176483653f1aa927dfbdeAndrew Trick 18163476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Unless we have a symbol with hidden visibility, we have to go through a 18263476a80404125e5196b6c09113c1d4796da0604Evan Cheng // normal $non_lazy_ptr stub because this symbol might be resolved late. 18363476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. 18463476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 18563476a80404125e5196b6c09113c1d4796da0604Evan Cheng } 18663476a80404125e5196b6c09113c1d4796da0604Evan Cheng } 18763476a80404125e5196b6c09113c1d4796da0604Evan Cheng 18863476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 189e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng} 190c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin 191654d5440a477b1f6c89b051107e041a331f78e27Owen Andersonunsigned ARMSubtarget::getMispredictionPenalty() const { 192d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick return SchedModel->MispredictPenalty; 193654d5440a477b1f6c89b051107e041a331f78e27Owen Anderson} 194654d5440a477b1f6c89b051107e041a331f78e27Owen Anderson 195c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwinbool ARMSubtarget::enablePostRAScheduler( 196c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin CodeGenOpt::Level OptLevel, 1975b1b4489cf3a0f56f8be0673fc5cc380a32d277bEvan Cheng TargetSubtargetInfo::AntiDepBreakMode& Mode, 19887d21b92fc42f6b3bd8567a83fc5b5191c1205e5David Goodwin RegClassVector& CriticalPathRCs) const { 1995b1b4489cf3a0f56f8be0673fc5cc380a32d277bEvan Cheng Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL; 20087d21b92fc42f6b3bd8567a83fc5b5191c1205e5David Goodwin CriticalPathRCs.clear(); 20187d21b92fc42f6b3bd8567a83fc5b5191c1205e5David Goodwin CriticalPathRCs.push_back(&ARM::GPRRegClass); 202c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin return PostRAScheduler && OptLevel >= CodeGenOpt::Default; 203c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin} 204