//
//===----------------------------------------------------------------------===//
//
-// This file implements the X86 specific subclass of TargetSubtarget.
+// This file implements the X86 specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "subtarget"
#include "X86Subtarget.h"
#include "X86InstrInfo.h"
-#include "X86GenSubtarget.inc"
-#include "llvm/GlobalValue.h"
+#include "X86TargetMachine.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Host.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
-#include "llvm/ADT/SmallVector.h"
-using namespace llvm;
#if defined(_MSC_VER)
#include <intrin.h>
#endif
+using namespace llvm;
+
+#define DEBUG_TYPE "subtarget"
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "X86GenSubtargetInfo.inc"
+
+// Temporary option to control early if-conversion for x86 while adding machine
+// models.
+static cl::opt<bool>
+X86EarlyIfConv("x86-early-ifcvt", cl::Hidden,
+ cl::desc("Enable early if-conversion on X86"));
+
+
/// ClassifyBlockAddressReference - Classify a blockaddress reference for the
/// current subtarget according to how we should reference it in a non-pcrel
/// context.
-unsigned char X86Subtarget::
-ClassifyBlockAddressReference() const {
+unsigned char X86Subtarget::ClassifyBlockAddressReference() const {
if (isPICStyleGOT()) // 32-bit ELF targets.
return X86II::MO_GOTOFF;
-
+
if (isPICStyleStubPIC()) // Darwin/32 in PIC mode.
return X86II::MO_PIC_BASE_OFFSET;
-
+
// Direct static reference to label.
return X86II::MO_NO_FLAG;
}
ClassifyGlobalReference(const GlobalValue *GV, const TargetMachine &TM) const {
// DLLImport only exists on windows, it is implemented as a load from a
// DLLIMPORT stub.
- if (GV->hasDLLImportLinkage())
+ if (GV->hasDLLImportStorageClass())
return X86II::MO_DLLIMPORT;
- // Determine whether this is a reference to a definition or a declaration.
- // Materializable GVs (in JIT lazy compilation mode) do not require an extra
- // load from stub.
- bool isDecl = GV->hasAvailableExternallyLinkage();
- if (GV->isDeclaration() && !GV->isMaterializable())
- isDecl = true;
+ bool isDecl = GV->isDeclarationForLinker();
// X86-64 in PIC mode.
if (isPICStyleRIPRel()) {
// Large model never uses stubs.
if (TM.getCodeModel() == CodeModel::Large)
return X86II::MO_NO_FLAG;
-
+
if (isTargetDarwin()) {
// If symbol visibility is hidden, the extra load is not needed if
// target is x86-64 or the symbol is definitely defined in the current
return X86II::MO_NO_FLAG;
}
-
+
if (isPICStyleGOT()) { // 32-bit ELF targets.
// Extra load is needed for all externally visible.
if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
return X86II::MO_GOTOFF;
return X86II::MO_GOT;
}
-
+
if (isPICStyleStubPIC()) { // Darwin/32 in PIC mode.
// Determine whether we have a stub reference and/or whether the reference
// is relative to the PIC base or not.
-
+
// If this is a strong reference to a definition, it is definitely not
// through a stub.
if (!isDecl && !GV->isWeakForLinker())
// normal $non_lazy_ptr stub because this symbol might be resolved late.
if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
return X86II::MO_DARWIN_NONLAZY_PIC_BASE;
-
+
// If symbol visibility is hidden, we have a stub for common symbol
// references and external declarations.
if (isDecl || GV->hasCommonLinkage()) {
// Hidden $non_lazy_ptr reference.
return X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE;
}
-
+
// Otherwise, no stub.
return X86II::MO_PIC_BASE_OFFSET;
}
-
+
if (isPICStyleStubNoDynamic()) { // Darwin/32 in -mdynamic-no-pic mode.
// Determine whether we have a stub reference.
-
+
// If this is a strong reference to a definition, it is definitely not
// through a stub.
if (!isDecl && !GV->isWeakForLinker())
return X86II::MO_NO_FLAG;
-
+
// Unless we have a symbol with hidden visibility, we have to go through a
// normal $non_lazy_ptr stub because this symbol might be resolved late.
if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
// Otherwise, no stub.
return X86II::MO_NO_FLAG;
}
-
+
// Direct static reference to global.
return X86II::MO_NO_FLAG;
}
/// passed as the second argument. Otherwise it returns null.
const char *X86Subtarget::getBZeroEntry() const {
// Darwin 10 has a __bzero entry point for this purpose.
- if (getDarwinVers() >= 10)
+ if (getTargetTriple().isMacOSX() &&
+ !getTargetTriple().isMacOSXVersionLT(10, 6))
return "__bzero";
- return 0;
+ return nullptr;
+}
+
+bool X86Subtarget::hasSinCos() const {
+ return getTargetTriple().isMacOSX() &&
+ !getTargetTriple().isMacOSXVersionLT(10, 9) &&
+ is64Bit();
}
/// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
/// to immediate address.
bool X86Subtarget::IsLegalToCallImmediateAddr(const TargetMachine &TM) const {
- if (Is64Bit)
+ // FIXME: I386 PE/COFF supports PC relative calls using IMAGE_REL_I386_REL32
+ // but WinCOFFObjectWriter::RecordRelocation cannot emit them. Once it does,
+ // the following check for Win32 should be removed.
+ if (In64BitMode || isTargetWin32())
return false;
return isTargetELF() || TM.getRelocationModel() == Reloc::Static;
}
-/// getSpecialAddressLatency - For targets where it is beneficial to
-/// backschedule instructions that compute addresses, return a value
-/// indicating the number of scheduling cycles of backscheduling that
-/// should be attempted.
-unsigned X86Subtarget::getSpecialAddressLatency() const {
- // For x86 out-of-order targets, back-schedule address computations so
- // that loads and stores aren't blocked.
- // This value was chosen arbitrarily.
- return 200;
-}
+void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
+ std::string CPUName = CPU;
+ if (CPUName.empty())
+ CPUName = "generic";
-/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the
-/// specified arguments. If we can't run cpuid on the host, return true.
-static bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX,
- unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
-#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
- #if defined(__GNUC__)
- // gcc doesn't know cpuid would clobber ebx/rbx. Preseve it manually.
- asm ("movq\t%%rbx, %%rsi\n\t"
- "cpuid\n\t"
- "xchgq\t%%rbx, %%rsi\n\t"
- : "=a" (*rEAX),
- "=S" (*rEBX),
- "=c" (*rECX),
- "=d" (*rEDX)
- : "a" (value));
- return false;
- #elif defined(_MSC_VER)
- int registers[4];
- __cpuid(registers, value);
- *rEAX = registers[0];
- *rEBX = registers[1];
- *rECX = registers[2];
- *rEDX = registers[3];
- return false;
- #endif
-#elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
- #if defined(__GNUC__)
- asm ("movl\t%%ebx, %%esi\n\t"
- "cpuid\n\t"
- "xchgl\t%%ebx, %%esi\n\t"
- : "=a" (*rEAX),
- "=S" (*rEBX),
- "=c" (*rECX),
- "=d" (*rEDX)
- : "a" (value));
- return false;
- #elif defined(_MSC_VER)
- __asm {
- mov eax,value
- cpuid
- mov esi,rEAX
- mov dword ptr [esi],eax
- mov esi,rEBX
- mov dword ptr [esi],ebx
- mov esi,rECX
- mov dword ptr [esi],ecx
- mov esi,rEDX
- mov dword ptr [esi],edx
- }
- return false;
- #endif
-#endif
- return true;
-}
-
-static void DetectFamilyModel(unsigned EAX, unsigned &Family, unsigned &Model) {
- Family = (EAX >> 8) & 0xf; // Bits 8 - 11
- Model = (EAX >> 4) & 0xf; // Bits 4 - 7
- if (Family == 6 || Family == 0xf) {
- if (Family == 0xf)
- // Examine extended family ID if family ID is F.
- Family += (EAX >> 20) & 0xff; // Bits 20 - 27
- // Examine extended model ID if family ID is 6 or F.
- Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19
+ // Make sure 64-bit features are available in 64-bit mode. (But make sure
+ // SSE2 can be turned off explicitly.)
+ std::string FullFS = FS;
+ if (In64BitMode) {
+ if (!FullFS.empty())
+ FullFS = "+64bit,+sse2," + FullFS;
+ else
+ FullFS = "+64bit,+sse2";
}
-}
-void X86Subtarget::AutoDetectSubtargetFeatures() {
- unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
- union {
- unsigned u[3];
- char c[12];
- } text;
-
- if (GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1))
- return;
-
- GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
-
- if ((EDX >> 15) & 1) HasCMov = true;
- if ((EDX >> 23) & 1) X86SSELevel = MMX;
- if ((EDX >> 25) & 1) X86SSELevel = SSE1;
- if ((EDX >> 26) & 1) X86SSELevel = SSE2;
- if (ECX & 0x1) X86SSELevel = SSE3;
- if ((ECX >> 9) & 1) X86SSELevel = SSSE3;
- if ((ECX >> 19) & 1) X86SSELevel = SSE41;
- if ((ECX >> 20) & 1) X86SSELevel = SSE42;
- // FIXME: AVX codegen support is not ready.
- //if ((ECX >> 28) & 1) { HasAVX = true; X86SSELevel = NoMMXSSE; }
-
- bool IsIntel = memcmp(text.c, "GenuineIntel", 12) == 0;
- bool IsAMD = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0;
-
- HasCLMUL = IsIntel && ((ECX >> 1) & 0x1);
- HasFMA3 = IsIntel && ((ECX >> 12) & 0x1);
- HasAES = IsIntel && ((ECX >> 25) & 0x1);
-
- if (IsIntel || IsAMD) {
- // Determine if bit test memory instructions are slow.
- unsigned Family = 0;
- unsigned Model = 0;
- DetectFamilyModel(EAX, Family, Model);
- IsBTMemSlow = IsAMD || (Family == 6 && Model >= 13);
- // If it's Nehalem, unaligned memory access is fast.
- if (Family == 15 && Model == 26)
- IsUAMemFast = true;
-
- GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
- HasX86_64 = (EDX >> 29) & 0x1;
- HasSSE4A = IsAMD && ((ECX >> 6) & 0x1);
- HasFMA4 = IsAMD && ((ECX >> 16) & 0x1);
- }
-}
+ // If feature string is not empty, parse features string.
+ ParseSubtargetFeatures(CPUName, FullFS);
-X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
- bool is64Bit)
- : PICStyle(PICStyles::None)
- , X86SSELevel(NoMMXSSE)
- , X863DNowLevel(NoThreeDNow)
- , HasCMov(false)
- , HasX86_64(false)
- , HasPOPCNT(false)
- , HasSSE4A(false)
- , HasAVX(false)
- , HasAES(false)
- , HasCLMUL(false)
- , HasFMA3(false)
- , HasFMA4(false)
- , IsBTMemSlow(false)
- , IsUAMemFast(false)
- , HasVectorUAMem(false)
- , stackAlignment(8)
- // FIXME: this is a known good value for Yonah. How about others?
- , MaxInlineSizeThreshold(128)
- , TargetTriple(TT)
- , Is64Bit(is64Bit) {
-
- // default to hard float ABI
- if (FloatABIType == FloatABI::Default)
- FloatABIType = FloatABI::Hard;
-
- // Determine default and user specified characteristics
- if (!FS.empty()) {
- // If feature string is not empty, parse features string.
- std::string CPU = sys::getHostCPUName();
- ParseSubtargetFeatures(FS, CPU);
- // All X86-64 CPUs also have SSE2, however user might request no SSE via
- // -mattr, so don't force SSELevel here.
- if (HasAVX)
- X86SSELevel = NoMMXSSE;
- } else {
- // Otherwise, use CPUID to auto-detect feature set.
- AutoDetectSubtargetFeatures();
- // Make sure SSE2 is enabled; it is available on all X86-64 CPUs.
- if (Is64Bit && !HasAVX && X86SSELevel < SSE2)
- X86SSELevel = SSE2;
- }
+ // Make sure the right MCSchedModel is used.
+ InitCPUSchedModel(CPUName);
- // If requesting codegen for X86-64, make sure that 64-bit features
- // are enabled.
- if (Is64Bit) {
- HasX86_64 = true;
+ InstrItins = getInstrItineraryForCPU(CPUName);
+
+ // It's important to keep the MCSubtargetInfo feature bits in sync with
+ // target data structure which is shared with MC code emitter, etc.
+ if (In64BitMode)
+ ToggleFeature(X86::Mode64Bit);
+ else if (In32BitMode)
+ ToggleFeature(X86::Mode32Bit);
+ else if (In16BitMode)
+ ToggleFeature(X86::Mode16Bit);
+ else
+ llvm_unreachable("Not 16-bit, 32-bit or 64-bit mode!");
- // All 64-bit cpus have cmov support.
- HasCMov = true;
- }
-
DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel
<< ", 3DNowLevel " << X863DNowLevel
<< ", 64bit " << HasX86_64 << "\n");
- assert((!Is64Bit || HasX86_64) &&
+ assert((!In64BitMode || HasX86_64) &&
"64-bit code requested on a subtarget that doesn't support it!");
- // Stack alignment is 16 bytes on Darwin (both 32 and 64 bit) and for all 64
- // bit targets.
- if (isTargetDarwin() || Is64Bit)
+ // Stack alignment is 16 bytes on Darwin, Linux and Solaris (both
+ // 32 and 64 bit) and for all 64-bit targets.
+ if (StackAlignOverride)
+ stackAlignment = StackAlignOverride;
+ else if (isTargetDarwin() || isTargetLinux() || isTargetSolaris() ||
+ In64BitMode)
stackAlignment = 16;
+}
- if (StackAlignment)
- stackAlignment = StackAlignment;
+void X86Subtarget::initializeEnvironment() {
+ X86SSELevel = NoMMXSSE;
+ X863DNowLevel = NoThreeDNow;
+ HasCMov = false;
+ HasX86_64 = false;
+ HasPOPCNT = false;
+ HasSSE4A = false;
+ HasAES = false;
+ HasPCLMUL = false;
+ HasFMA = false;
+ HasFMA4 = false;
+ HasXOP = false;
+ HasTBM = false;
+ HasMOVBE = false;
+ HasRDRAND = false;
+ HasF16C = false;
+ HasFSGSBase = false;
+ HasLZCNT = false;
+ HasBMI = false;
+ HasBMI2 = false;
+ HasRTM = false;
+ HasHLE = false;
+ HasERI = false;
+ HasCDI = false;
+ HasPFI = false;
+ HasDQI = false;
+ HasBWI = false;
+ HasVLX = false;
+ HasADX = false;
+ HasSHA = false;
+ HasPRFCHW = false;
+ HasRDSEED = false;
+ HasMPX = false;
+ IsBTMemSlow = false;
+ IsSHLDSlow = false;
+ IsUAMemFast = false;
+ IsUAMem32Slow = false;
+ HasSSEUnalignedMem = false;
+ HasCmpxchg16b = false;
+ UseLeaForSP = false;
+ HasSlowDivide32 = false;
+ HasSlowDivide64 = false;
+ PadShortFunctions = false;
+ CallRegIndirect = false;
+ LEAUsesAG = false;
+ SlowLEA = false;
+ SlowIncDec = false;
+ stackAlignment = 4;
+ // FIXME: this is a known good value for Yonah. How about others?
+ MaxInlineSizeThreshold = 128;
+ UseSoftFloat = false;
}
-/// IsCalleePop - Determines whether the callee is required to pop its
-/// own arguments. Callee pop is necessary to support tail calls.
-bool X86Subtarget::IsCalleePop(bool IsVarArg,
- CallingConv::ID CallingConv) const {
- if (IsVarArg)
- return false;
+X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU,
+ StringRef FS) {
+ initializeEnvironment();
+ initSubtargetFeatures(CPU, FS);
+ return *this;
+}
- switch (CallingConv) {
- default:
- return false;
- case CallingConv::X86_StdCall:
- return !is64Bit();
- case CallingConv::X86_FastCall:
- return !is64Bit();
- case CallingConv::X86_ThisCall:
- return !is64Bit();
- case CallingConv::Fast:
- return GuaranteedTailCallOpt;
- case CallingConv::GHC:
- return GuaranteedTailCallOpt;
+X86Subtarget::X86Subtarget(const Triple &TT, const std::string &CPU,
+ const std::string &FS, const X86TargetMachine &TM,
+ unsigned StackAlignOverride)
+ : X86GenSubtargetInfo(TT, CPU, FS), X86ProcFamily(Others),
+ PICStyle(PICStyles::None), TargetTriple(TT),
+ StackAlignOverride(StackAlignOverride),
+ In64BitMode(TargetTriple.getArch() == Triple::x86_64),
+ In32BitMode(TargetTriple.getArch() == Triple::x86 &&
+ TargetTriple.getEnvironment() != Triple::CODE16),
+ In16BitMode(TargetTriple.getArch() == Triple::x86 &&
+ TargetTriple.getEnvironment() == Triple::CODE16),
+ TSInfo(*TM.getDataLayout()),
+ InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
+ FrameLowering(*this, getStackAlignment()) {
+ // Determine the PICStyle based on the target selected.
+ if (TM.getRelocationModel() == Reloc::Static) {
+ // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
+ setPICStyle(PICStyles::None);
+ } else if (is64Bit()) {
+ // PIC in 64 bit mode is always rip-rel.
+ setPICStyle(PICStyles::RIPRel);
+ } else if (isTargetCOFF()) {
+ setPICStyle(PICStyles::None);
+ } else if (isTargetDarwin()) {
+ if (TM.getRelocationModel() == Reloc::PIC_)
+ setPICStyle(PICStyles::StubPIC);
+ else {
+ assert(TM.getRelocationModel() == Reloc::DynamicNoPIC);
+ setPICStyle(PICStyles::StubDynamicNoPIC);
+ }
+ } else if (isTargetELF()) {
+ setPICStyle(PICStyles::GOT);
}
}
+
+bool X86Subtarget::enableEarlyIfConversion() const {
+ return hasCMov() && X86EarlyIfConv;
+}
+
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