ARMSubtarget.cpp revision dce4a407a24b04eebc6a376f8e62b41aaa7b071f
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" 15e127dfd0b175b5a336e61fecaad7fc2aec65d95cAndrew Trick#include "ARMBaseInstrInfo.h" 16b72d2a92b75daa9cbac7338aff0cd8ae04c2b4bdEvan Cheng#include "ARMBaseRegisterInfo.h" 174788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling#include "llvm/IR/Attributes.h" 184788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling#include "llvm/IR/Function.h" 1936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines#include "llvm/IR/GlobalValue.h" 2054fc124d72512d65d62565cabcd85c7b07496513Bob Wilson#include "llvm/Support/CommandLine.h" 21d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Target/TargetInstrInfo.h" 223382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin#include "llvm/Target/TargetOptions.h" 2394214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 24dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesusing namespace llvm; 25dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 26dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines#define DEBUG_TYPE "arm-subtarget" 27dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 2894214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng#define GET_SUBTARGETINFO_TARGET_DESC 29ebdeeab812beec0385b445f3d4c41a114e0d972fEvan Cheng#define GET_SUBTARGETINFO_CTOR 30385e930d55f3ecd3c9538823dfa5896a12461845Evan Cheng#include "ARMGenSubtargetInfo.inc" 3194214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 3236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesstatic cl::opt<bool> 3354fc124d72512d65d62565cabcd85c7b07496513Bob WilsonReserveR9("arm-reserve-r9", cl::Hidden, 3454fc124d72512d65d62565cabcd85c7b07496513Bob Wilson cl::desc("Reserve R9, making it unavailable as GPR")); 3554fc124d72512d65d62565cabcd85c7b07496513Bob Wilson 365cdc3a949af0cef7f2163f8a7acbf3049c226321Anton Korobeynikovstatic cl::opt<bool> 3714c41370e36068ae25c871d5bd8f99f92bbb7d45Renato GolinArmUseMOVT("arm-use-movt", cl::init(true), cl::Hidden); 385cdc3a949af0cef7f2163f8a7acbf3049c226321Anton Korobeynikov 3902aba73a9ec04d0de9424422249af3948ca9573aBob Wilsonstatic cl::opt<bool> 40eb1641d54a7eda7717304bc4d55d059208d8ebedBob WilsonUseFusedMulOps("arm-use-mulops", 41eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson cl::init(true), cl::Hidden); 42eb1641d54a7eda7717304bc4d55d059208d8ebedBob Wilson 43bab06ba696694e7f62f964af7ee5290a13f78340JF Bastienenum AlignMode { 44bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien DefaultAlign, 45bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien StrictAlign, 46bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien NoStrictAlign 47bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien}; 48bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien 49bab06ba696694e7f62f964af7ee5290a13f78340JF Bastienstatic cl::opt<AlignMode> 50bab06ba696694e7f62f964af7ee5290a13f78340JF BastienAlign(cl::desc("Load/store alignment support"), 51bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien cl::Hidden, cl::init(DefaultAlign), 52bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien cl::values( 53bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien clEnumValN(DefaultAlign, "arm-default-align", 54bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien "Generate unaligned accesses only on hardware/OS " 55bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien "combinations that are known to support them"), 56bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien clEnumValN(StrictAlign, "arm-strict-align", 57bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien "Disallow all unaligned memory accesses"), 58bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien clEnumValN(NoStrictAlign, "arm-no-strict-align", 59bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien "Allow unaligned memory accesses"), 60bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien clEnumValEnd)); 6102aba73a9ec04d0de9424422249af3948ca9573aBob Wilson 62929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhaoenum ITMode { 63929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao DefaultIT, 64929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao RestrictedIT, 65929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao NoRestrictedIT 66929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao}; 67929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao 68929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhaostatic cl::opt<ITMode> 69929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming ZhaoIT(cl::desc("IT block support"), cl::Hidden, cl::init(DefaultIT), 70929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao cl::ZeroOrMore, 71929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao cl::values(clEnumValN(DefaultIT, "arm-default-it", 72929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao "Generate IT block based on arch"), 73929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao clEnumValN(RestrictedIT, "arm-restrict-it", 74929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao "Disallow deprecated IT based on ARMv8"), 75929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao clEnumValN(NoRestrictedIT, "arm-no-restrict-it", 76929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao "Allow IT blocks based on ARMv7"), 77929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao clEnumValEnd)); 78929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao 79276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan ChengARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU, 8036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const std::string &FS, bool IsLittle, 8136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetOptions &Options) 820ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng : ARMGenSubtargetInfo(TT, CPU, FS) 833ef1c8759a20167457eb7fd82ebcaffe7ccaa1d1Evan Cheng , ARMProcFamily(Others) 840f22c134be40a337b30e30bdafb9e8b6880dea1eAmara Emerson , ARMProcClass(None) 853630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio , stackAlignment(4) 86276365dd4bc0c2160f91fd8062ae1fc90c86c324Evan Cheng , CPUString(CPU) 8736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines , IsLittle(IsLittle) 88b72d2a92b75daa9cbac7338aff0cd8ae04c2b4bdEvan Cheng , TargetTriple(TT) 893382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin , Options(Options) 9036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines , TargetABI(ARM_ABI_UNKNOWN) { 91901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling initializeEnvironment(); 924788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling resetSubtargetFeatures(CPU, FS); 934788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling} 944788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling 95901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendlingvoid ARMSubtarget::initializeEnvironment() { 96901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV4TOps = false; 97901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV5TOps = false; 98901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV5TEOps = false; 99901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV6Ops = false; 100ca7b2d08d7b918e5e8e921a837623af962b27d00Amara Emerson HasV6MOps = false; 101901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV6T2Ops = false; 102901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasV7Ops = false; 103849eedce9921eb8f285cd0df0ad69ee5133459d1Joey Gouly HasV8Ops = false; 104901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasVFPv2 = false; 105901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasVFPv3 = false; 106901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasVFPv4 = false; 1072a9af9f18eac90b0de739b6ceddf6c2209086303Joey Gouly HasFPARMv8 = false; 108901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasNEON = false; 10936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MinSize = false; 110901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling UseNEONForSinglePrecisionFP = false; 111901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling UseMulOps = UseFusedMulOps; 112901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling SlowFPVMLx = false; 113901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasVMLxForwarding = false; 114901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling SlowFPBrcc = false; 115901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling InThumbMode = false; 116901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasThumb2 = false; 117901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling NoARM = false; 118901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling PostRAScheduler = false; 119901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling IsR9Reserved = ReserveR9; 120901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling UseMovt = false; 121901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling SupportsTailCall = false; 122901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasFP16 = false; 123901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasD16 = false; 124901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasHardwareDivide = false; 125901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasHardwareDivideInARM = false; 126901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasT2ExtractPack = false; 127901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasDataBarrier = false; 128901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling Pref32BitThumb = false; 129901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling AvoidCPSRPartialUpdate = false; 130901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling AvoidMOVsShifterOperand = false; 131901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasRAS = false; 132901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling HasMPExtension = false; 1336186de5c54b580414b2d162e0f335b62b3d9812cBradley Smith HasVirtualization = false; 134901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling FPOnlySP = false; 135b94a353242b26af5c0969926a6b84664e342b586Tim Northover HasPerfMon = false; 1368c9e52a9fc1f99cf80c499ef10e6c8a54ef899d4Tim Northover HasTrustZone = false; 1375df37dab763ce377095389c4ea1cff88db369954Amara Emerson HasCrypto = false; 13857bca7b26ec916ca1b74b1408608a6c69a1aa422Amara Emerson HasCRC = false; 13936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines HasZeroCycleZeroing = false; 140901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling AllowsUnalignedMem = false; 141901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling Thumb2DSP = false; 142901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling UseNaClTrap = false; 1433382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin UnsafeFPMath = false; 144373aa5c665fe6df6b9c5586d397dc3617f25aab5Stephen Hines UseLong64 = false; 145901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling} 146901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling 1474788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendlingvoid ARMSubtarget::resetSubtargetFeatures(const MachineFunction *MF) { 1484788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling AttributeSet FnAttrs = MF->getFunction()->getAttributes(); 1494788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling Attribute CPUAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex, 1504788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling "target-cpu"); 1514788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling Attribute FSAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex, 1524788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling "target-features"); 1534788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling std::string CPU = 1544788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling !CPUAttr.hasAttribute(Attribute::None) ?CPUAttr.getValueAsString() : ""; 1554788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling std::string FS = 1564788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling !FSAttr.hasAttribute(Attribute::None) ? FSAttr.getValueAsString() : ""; 157901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling if (!FS.empty()) { 158901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling initializeEnvironment(); 1594788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling resetSubtargetFeatures(CPU, FS); 160901d80065c9afa0ba33e8546c2e1e99a00aceb14Bill Wendling } 16136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 16236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MinSize = 16336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines FnAttrs.hasAttribute(AttributeSet::FunctionIndex, Attribute::MinSize); 1644788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling} 1654788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling 1664788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendlingvoid ARMSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) { 167195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller if (CPUString.empty()) { 168195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller if (isTargetIOS() && TargetTriple.getArchName().endswith("v7s")) 169195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller // Default to the Swift CPU when targeting armv7s/thumbv7s. 170195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller CPUString = "swift"; 171195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller else 172195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller CPUString = "generic"; 173195dd8a1ce38970e3463ee1425647280373b60a7Tilmann Scheller } 1744b1747430a2d67702958b95d6776396734f184a0Evan Cheng 1754cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // Insert the architecture feature derived from the target triple into the 1764cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // feature string. This is important for setting features that are implied 1774cc446bc400b2ff58af81c91f5e145b81d6beb26Evan Cheng // based on the architecture version. 1784788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling std::string ArchFS = ARM_MC::ParseARMTriple(TargetTriple.getTriple(), 1794788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling CPUString); 18094ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng if (!FS.empty()) { 18194ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng if (!ArchFS.empty()) 1824788d14b484ba9e2fe19855fd6c97a3659980fcaBill Wendling ArchFS = ArchFS + "," + FS.str(); 18394ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng else 18494ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng ArchFS = FS; 18594ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng } 1860ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng ParseSubtargetFeatures(CPUString, ArchFS); 18794ca42ff0407d71bacc41de4032d8dbe6358d33dEvan Cheng 18836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // FIXME: This used enable V6T2 support implicitly for Thumb2 mode. 18936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // Assert this for now to make the change obvious. 19036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines assert(hasV6T2Ops() || !hasThumb2()); 19166f6c79450a93d979128d8702c83841c8f715dc8Bob Wilson 192d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick // Keep a pointer to static instruction cost data for the specified CPU. 193d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick SchedModel = getSchedModelForCPU(CPUString); 194d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick 19594214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng // Initialize scheduling itinerary for the specified CPU. 19694214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng InstrItins = getInstrItineraryForCPU(CPUString); 19794214703d97d8d9dfca88174ffc7e94820a85e62Evan Cheng 19836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (TargetABI == ARM_ABI_UNKNOWN) { 19936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines switch (TargetTriple.getEnvironment()) { 20036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case Triple::Android: 20136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case Triple::EABI: 20236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case Triple::EABIHF: 20336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case Triple::GNUEABI: 20436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case Triple::GNUEABIHF: 20536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TargetABI = ARM_ABI_AAPCS; 20636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines break; 20736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines default: 20836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if ((isTargetIOS() && isMClass()) || 20936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines (TargetTriple.isOSBinFormatMachO() && 21036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TargetTriple.getOS() == Triple::UnknownOS)) 21136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TargetABI = ARM_ABI_AAPCS; 21236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines else 21336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TargetABI = ARM_ABI_APCS; 21436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines break; 21536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines } 21636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines } 21736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 21836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // FIXME: this is invalid for WindowsCE 21936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (isTargetWindows()) { 2200ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng TargetABI = ARM_ABI_AAPCS; 22136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines NoARM = true; 22236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines } 2230ddff1b5359433faf2eb1c4ff5320ddcbd42f52fEvan Cheng 2243630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio if (isAAPCS_ABI()) 2253630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio stackAlignment = 8; 22636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (isTargetNaCl()) 22736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines stackAlignment = 16; 2283630e78db9268dbe81a9369a33e49b857804f2ecLauro Ramos Venancio 22914c41370e36068ae25c871d5bd8f99f92bbb7d45Renato Golin UseMovt = hasV6T2Ops() && ArmUseMOVT; 23014c41370e36068ae25c871d5bd8f99f92bbb7d45Renato Golin 23136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (isTargetMachO()) { 23239dfb0ff848be6b380ca81ff95d4ca4e0ae09c76Evan Cheng IsR9Reserved = ReserveR9 | !HasV6Ops; 23336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines SupportsTailCall = !isTargetIOS() || !getTargetTriple().isOSVersionLT(5, 0); 23436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines } else { 23536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines IsR9Reserved = ReserveR9; 23636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines SupportsTailCall = !isThumb1Only(); 2375de5d4b6d0eb3fd379fa571d82f6fa764460b3b8Evan Cheng } 238471850ab84301dd47cab2bf8d694fcb5766c1169David Goodwin 239d3dd50fec00fbbb76edbfaff4d613f1248d21c9eEvan Cheng if (!isThumb() || hasThumb2()) 240d3dd50fec00fbbb76edbfaff4d613f1248d21c9eEvan Cheng PostRAScheduler = true; 24102aba73a9ec04d0de9424422249af3948ca9573aBob Wilson 242bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien switch (Align) { 243bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien case DefaultAlign: 244bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // Assume pre-ARMv6 doesn't support unaligned accesses. 245bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // 246bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // ARMv6 may or may not support unaligned accesses depending on the 247bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // SCTLR.U bit, which is architecture-specific. We assume ARMv6 24836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // Darwin and NetBSD targets support unaligned accesses, and others don't. 249bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // 250bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // ARMv7 always has SCTLR.U set to 1, but it has a new SCTLR.A bit 251bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // which raises an alignment fault on unaligned accesses. Linux 252bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // defaults this bit to 0 and handles it as a system-wide (not 253bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // per-process) setting. It is therefore safe to assume that ARMv7+ 254bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // Linux targets support unaligned accesses. The same goes for NaCl. 255bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // 256bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien // The above behavior is consistent with GCC. 25736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines AllowsUnalignedMem = 25836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines (hasV7Ops() && (isTargetLinux() || isTargetNaCl() || 25936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines isTargetNetBSD())) || 26036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines (hasV6Ops() && (isTargetMachO() || isTargetNetBSD())); 26136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // The one exception is cortex-m0, which despite being v6, does not 26236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // support unaligned accesses. Rather than make the above boolean 26336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // expression even more obtuse, just override the value here. 26436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (isThumb1Only() && isMClass()) 26536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines AllowsUnalignedMem = false; 266bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien break; 267bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien case StrictAlign: 268bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien AllowsUnalignedMem = false; 269bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien break; 270bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien case NoStrictAlign: 271bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien AllowsUnalignedMem = true; 272bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien break; 273bab06ba696694e7f62f964af7ee5290a13f78340JF Bastien } 2743382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin 275929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao switch (IT) { 276929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao case DefaultIT: 277929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao RestrictIT = hasV8Ops() ? true : false; 278929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao break; 279929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao case RestrictedIT: 280929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao RestrictIT = true; 281929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao break; 282929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao case NoRestrictedIT: 283929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao RestrictIT = false; 284929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao break; 285929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao } 286929bdb23794b615dc6b0cc59db21f0450c3ce33bWeiming Zhao 2873382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin // NEON f32 ops are non-IEEE 754 compliant. Darwin is ok with it by default. 2883382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin uint64_t Bits = getFeatureBits(); 2893382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin if ((Bits & ARM::ProcA5 || Bits & ARM::ProcA8) && // Where this matters 2903382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin (Options.UnsafeFPMath || isTargetDarwin())) 2913382a840747c42c4a98eac802ee7b347a8ded1e4Renato Golin UseNEONForSinglePrecisionFP = true; 292a8e2989ece6dc46df59b0768184028257f913843Evan Cheng} 293e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng 294e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol. 29563476a80404125e5196b6c09113c1d4796da0604Evan Chengbool 29646510a73e977273ec67747eb34cbdb43f815e451Dan GohmanARMSubtarget::GVIsIndirectSymbol(const GlobalValue *GV, 29746510a73e977273ec67747eb34cbdb43f815e451Dan Gohman Reloc::Model RelocM) const { 29863476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (RelocM == Reloc::Static) 299e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng return false; 30063476a80404125e5196b6c09113c1d4796da0604Evan Cheng 301f0356fe140af1a30587b9a86bcfb1b2c51b8ce20Jeffrey Yasskin // Materializable GVs (in JIT lazy compilation mode) do not require an extra 302f0356fe140af1a30587b9a86bcfb1b2c51b8ce20Jeffrey Yasskin // load from stub. 303af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng bool isDecl = GV->hasAvailableExternallyLinkage(); 304af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng if (GV->isDeclaration() && !GV->isMaterializable()) 305af05c69ba024b1838ae6f1071d6fd0f9fe33999fEvan Cheng isDecl = true; 30663476a80404125e5196b6c09113c1d4796da0604Evan Cheng 30736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (!isTargetMachO()) { 30863476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Extra load is needed for all externally visible. 30963476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (GV->hasLocalLinkage() || GV->hasHiddenVisibility()) 31063476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 31163476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 31263476a80404125e5196b6c09113c1d4796da0604Evan Cheng } else { 31363476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (RelocM == Reloc::PIC_) { 31463476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If this is a strong reference to a definition, it is definitely not 31563476a80404125e5196b6c09113c1d4796da0604Evan Cheng // through a stub. 31663476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!isDecl && !GV->isWeakForLinker()) 31763476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 31863476a80404125e5196b6c09113c1d4796da0604Evan Cheng 31963476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Unless we have a symbol with hidden visibility, we have to go through a 32063476a80404125e5196b6c09113c1d4796da0604Evan Cheng // normal $non_lazy_ptr stub because this symbol might be resolved late. 32163476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. 32263476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 32363476a80404125e5196b6c09113c1d4796da0604Evan Cheng 32463476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If symbol visibility is hidden, we have a stub for common symbol 32563476a80404125e5196b6c09113c1d4796da0604Evan Cheng // references and external declarations. 32663476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (isDecl || GV->hasCommonLinkage()) 32763476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Hidden $non_lazy_ptr reference. 32863476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 32963476a80404125e5196b6c09113c1d4796da0604Evan Cheng 33063476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 33163476a80404125e5196b6c09113c1d4796da0604Evan Cheng } else { 33263476a80404125e5196b6c09113c1d4796da0604Evan Cheng // If this is a strong reference to a definition, it is definitely not 33363476a80404125e5196b6c09113c1d4796da0604Evan Cheng // through a stub. 33463476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!isDecl && !GV->isWeakForLinker()) 33563476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 3366e8f4c404825b79f9b9176483653f1aa927dfbdeAndrew Trick 33763476a80404125e5196b6c09113c1d4796da0604Evan Cheng // Unless we have a symbol with hidden visibility, we have to go through a 33863476a80404125e5196b6c09113c1d4796da0604Evan Cheng // normal $non_lazy_ptr stub because this symbol might be resolved late. 33963476a80404125e5196b6c09113c1d4796da0604Evan Cheng if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. 34063476a80404125e5196b6c09113c1d4796da0604Evan Cheng return true; 34163476a80404125e5196b6c09113c1d4796da0604Evan Cheng } 34263476a80404125e5196b6c09113c1d4796da0604Evan Cheng } 34363476a80404125e5196b6c09113c1d4796da0604Evan Cheng 34463476a80404125e5196b6c09113c1d4796da0604Evan Cheng return false; 345e4e4ed3b56f63e9343e01bf0b2ecd7c1f45d296cEvan Cheng} 346c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin 347654d5440a477b1f6c89b051107e041a331f78e27Owen Andersonunsigned ARMSubtarget::getMispredictionPenalty() const { 348d43b5c97cff06d7840b974ca84fa0639d2567968Andrew Trick return SchedModel->MispredictPenalty; 349654d5440a477b1f6c89b051107e041a331f78e27Owen Anderson} 350654d5440a477b1f6c89b051107e041a331f78e27Owen Anderson 351cb01efb7988d119d6e2aedab1740695aa6a9cc0cBob Wilsonbool ARMSubtarget::hasSinCos() const { 352cb01efb7988d119d6e2aedab1740695aa6a9cc0cBob Wilson return getTargetTriple().getOS() == Triple::IOS && 353cb01efb7988d119d6e2aedab1740695aa6a9cc0cBob Wilson !getTargetTriple().isOSVersionLT(7, 0); 354cb01efb7988d119d6e2aedab1740695aa6a9cc0cBob Wilson} 355cb01efb7988d119d6e2aedab1740695aa6a9cc0cBob Wilson 356c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwinbool ARMSubtarget::enablePostRAScheduler( 357c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin CodeGenOpt::Level OptLevel, 3585b1b4489cf3a0f56f8be0673fc5cc380a32d277bEvan Cheng TargetSubtargetInfo::AntiDepBreakMode& Mode, 35987d21b92fc42f6b3bd8567a83fc5b5191c1205e5David Goodwin RegClassVector& CriticalPathRCs) const { 360dfca6eec3171802d6fcb091da01604ef4420fb3bAndrew Trick Mode = TargetSubtargetInfo::ANTIDEP_NONE; 361c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin return PostRAScheduler && OptLevel >= CodeGenOpt::Default; 362c2e8a7e8d2ab156afaa8ab0d0317dd9ee3db7d30David Goodwin} 363