mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
482 lines
15 KiB
C++
482 lines
15 KiB
C++
//===-- X86Subtarget.cpp - X86 Subtarget Information ------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the X86 specific subclass of TargetSubtarget.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "subtarget"
|
|
#include "X86Subtarget.h"
|
|
#include "X86InstrInfo.h"
|
|
#include "X86GenSubtarget.inc"
|
|
#include "llvm/GlobalValue.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
using namespace llvm;
|
|
|
|
#if defined(_MSC_VER)
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
static cl::opt<X86Subtarget::AsmWriterFlavorTy>
|
|
AsmWriterFlavor("x86-asm-syntax", cl::init(X86Subtarget::Unset),
|
|
cl::desc("Choose style of code to emit from X86 backend:"),
|
|
cl::values(
|
|
clEnumValN(X86Subtarget::ATT, "att", "Emit AT&T-style assembly"),
|
|
clEnumValN(X86Subtarget::Intel, "intel", "Emit Intel-style assembly"),
|
|
clEnumValEnd));
|
|
|
|
/// ClassifyGlobalReference - Classify a global variable reference for the
|
|
/// current subtarget according to how we should reference it in a non-pcrel
|
|
/// context.
|
|
unsigned char X86Subtarget::
|
|
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())
|
|
return X86II::MO_DLLIMPORT;
|
|
|
|
// GV with ghost linkage (in JIT lazy compilation mode) do not require an
|
|
// extra load from stub.
|
|
bool isDecl = GV->isDeclaration() && !GV->hasNotBeenReadFromBitcode();
|
|
|
|
// 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
|
|
// translation unit.
|
|
if (GV->hasDefaultVisibility() &&
|
|
(isDecl || GV->isWeakForLinker()))
|
|
return X86II::MO_GOTPCREL;
|
|
} else {
|
|
assert(isTargetELF() && "Unknown rip-relative target");
|
|
|
|
// Extra load is needed for all externally visible.
|
|
if (!GV->hasLocalLinkage() && GV->hasDefaultVisibility())
|
|
return X86II::MO_GOTPCREL;
|
|
}
|
|
|
|
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())
|
|
return X86II::MO_PIC_BASE_OFFSET;
|
|
|
|
// 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.
|
|
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.
|
|
return X86II::MO_DARWIN_NONLAZY;
|
|
|
|
// 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;
|
|
}
|
|
|
|
// Otherwise, no stub.
|
|
return X86II::MO_NO_FLAG;
|
|
}
|
|
|
|
// Direct static reference to global.
|
|
return X86II::MO_NO_FLAG;
|
|
}
|
|
|
|
|
|
/// getBZeroEntry - This function returns the name of a function which has an
|
|
/// interface like the non-standard bzero function, if such a function exists on
|
|
/// the current subtarget and it is considered prefereable over memset with zero
|
|
/// 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)
|
|
return "__bzero";
|
|
|
|
return 0;
|
|
}
|
|
|
|
/// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
|
|
/// to immediate address.
|
|
bool X86Subtarget::IsLegalToCallImmediateAddr(const TargetMachine &TM) const {
|
|
if (Is64Bit)
|
|
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;
|
|
}
|
|
|
|
/// 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.
|
|
bool X86::GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
|
|
unsigned *rECX, unsigned *rEDX) {
|
|
#if defined(__x86_64__) || defined(_M_AMD64)
|
|
#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
|
|
}
|
|
}
|
|
|
|
void X86Subtarget::AutoDetectSubtargetFeatures() {
|
|
unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
|
|
union {
|
|
unsigned u[3];
|
|
char c[12];
|
|
} text;
|
|
|
|
if (X86::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1))
|
|
return;
|
|
|
|
X86::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
|
|
|
|
if ((EDX >> 23) & 0x1) X86SSELevel = MMX;
|
|
if ((EDX >> 25) & 0x1) X86SSELevel = SSE1;
|
|
if ((EDX >> 26) & 0x1) X86SSELevel = SSE2;
|
|
if (ECX & 0x1) X86SSELevel = SSE3;
|
|
if ((ECX >> 9) & 0x1) X86SSELevel = SSSE3;
|
|
if ((ECX >> 19) & 0x1) X86SSELevel = SSE41;
|
|
if ((ECX >> 20) & 0x1) X86SSELevel = SSE42;
|
|
|
|
bool IsIntel = memcmp(text.c, "GenuineIntel", 12) == 0;
|
|
bool IsAMD = !IsIntel && memcmp(text.c, "AuthenticAMD", 12) == 0;
|
|
|
|
HasFMA3 = IsIntel && ((ECX >> 12) & 0x1);
|
|
HasAVX = ((ECX >> 28) & 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);
|
|
|
|
X86::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
|
|
HasX86_64 = (EDX >> 29) & 0x1;
|
|
HasSSE4A = IsAMD && ((ECX >> 6) & 0x1);
|
|
HasFMA4 = IsAMD && ((ECX >> 16) & 0x1);
|
|
}
|
|
}
|
|
|
|
static const char *GetCurrentX86CPU() {
|
|
unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
|
|
if (X86::GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX))
|
|
return "generic";
|
|
unsigned Family = 0;
|
|
unsigned Model = 0;
|
|
DetectFamilyModel(EAX, Family, Model);
|
|
|
|
X86::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
|
|
bool Em64T = (EDX >> 29) & 0x1;
|
|
bool HasSSE3 = (ECX & 0x1);
|
|
|
|
union {
|
|
unsigned u[3];
|
|
char c[12];
|
|
} text;
|
|
|
|
X86::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1);
|
|
if (memcmp(text.c, "GenuineIntel", 12) == 0) {
|
|
switch (Family) {
|
|
case 3:
|
|
return "i386";
|
|
case 4:
|
|
return "i486";
|
|
case 5:
|
|
switch (Model) {
|
|
case 4: return "pentium-mmx";
|
|
default: return "pentium";
|
|
}
|
|
case 6:
|
|
switch (Model) {
|
|
case 1: return "pentiumpro";
|
|
case 3:
|
|
case 5:
|
|
case 6: return "pentium2";
|
|
case 7:
|
|
case 8:
|
|
case 10:
|
|
case 11: return "pentium3";
|
|
case 9:
|
|
case 13: return "pentium-m";
|
|
case 14: return "yonah";
|
|
case 15:
|
|
case 22: // Celeron M 540
|
|
return "core2";
|
|
case 23: // 45nm: Penryn , Wolfdale, Yorkfield (XE)
|
|
return "penryn";
|
|
default: return "i686";
|
|
}
|
|
case 15: {
|
|
switch (Model) {
|
|
case 3:
|
|
case 4:
|
|
case 6: // same as 4, but 65nm
|
|
return (Em64T) ? "nocona" : "prescott";
|
|
case 26:
|
|
return "corei7";
|
|
case 28:
|
|
return "atom";
|
|
default:
|
|
return (Em64T) ? "x86-64" : "pentium4";
|
|
}
|
|
}
|
|
|
|
default:
|
|
return "generic";
|
|
}
|
|
} else if (memcmp(text.c, "AuthenticAMD", 12) == 0) {
|
|
// FIXME: this poorly matches the generated SubtargetFeatureKV table. There
|
|
// appears to be no way to generate the wide variety of AMD-specific targets
|
|
// from the information returned from CPUID.
|
|
switch (Family) {
|
|
case 4:
|
|
return "i486";
|
|
case 5:
|
|
switch (Model) {
|
|
case 6:
|
|
case 7: return "k6";
|
|
case 8: return "k6-2";
|
|
case 9:
|
|
case 13: return "k6-3";
|
|
default: return "pentium";
|
|
}
|
|
case 6:
|
|
switch (Model) {
|
|
case 4: return "athlon-tbird";
|
|
case 6:
|
|
case 7:
|
|
case 8: return "athlon-mp";
|
|
case 10: return "athlon-xp";
|
|
default: return "athlon";
|
|
}
|
|
case 15:
|
|
if (HasSSE3) {
|
|
return "k8-sse3";
|
|
} else {
|
|
switch (Model) {
|
|
case 1: return "opteron";
|
|
case 5: return "athlon-fx"; // also opteron
|
|
default: return "athlon64";
|
|
}
|
|
}
|
|
case 16:
|
|
return "amdfam10";
|
|
default:
|
|
return "generic";
|
|
}
|
|
} else {
|
|
return "generic";
|
|
}
|
|
}
|
|
|
|
X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
|
|
bool is64Bit)
|
|
: AsmFlavor(AsmWriterFlavor)
|
|
, PICStyle(PICStyles::None)
|
|
, X86SSELevel(NoMMXSSE)
|
|
, X863DNowLevel(NoThreeDNow)
|
|
, HasX86_64(false)
|
|
, HasSSE4A(false)
|
|
, HasAVX(false)
|
|
, HasFMA3(false)
|
|
, HasFMA4(false)
|
|
, IsBTMemSlow(false)
|
|
, DarwinVers(0)
|
|
, IsLinux(false)
|
|
, stackAlignment(8)
|
|
// FIXME: this is a known good value for Yonah. How about others?
|
|
, MaxInlineSizeThreshold(128)
|
|
, Is64Bit(is64Bit)
|
|
, TargetType(isELF) { // Default to ELF unless otherwise specified.
|
|
|
|
// 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 = GetCurrentX86CPU();
|
|
ParseSubtargetFeatures(FS, CPU);
|
|
// All X86-64 CPUs also have SSE2, however user might request no SSE via
|
|
// -mattr, so don't force SSELevel here.
|
|
} 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 && X86SSELevel < SSE2)
|
|
X86SSELevel = SSE2;
|
|
}
|
|
|
|
// If requesting codegen for X86-64, make sure that 64-bit features
|
|
// are enabled.
|
|
if (Is64Bit)
|
|
HasX86_64 = true;
|
|
|
|
DEBUG(errs() << "Subtarget features: SSELevel " << X86SSELevel
|
|
<< ", 3DNowLevel " << X863DNowLevel
|
|
<< ", 64bit " << HasX86_64 << "\n");
|
|
assert((!Is64Bit || HasX86_64) &&
|
|
"64-bit code requested on a subtarget that doesn't support it!");
|
|
|
|
// Set the boolean corresponding to the current target triple, or the default
|
|
// if one cannot be determined, to true.
|
|
if (TT.length() > 5) {
|
|
size_t Pos;
|
|
if ((Pos = TT.find("-darwin")) != std::string::npos) {
|
|
TargetType = isDarwin;
|
|
|
|
// Compute the darwin version number.
|
|
if (isdigit(TT[Pos+7]))
|
|
DarwinVers = atoi(&TT[Pos+7]);
|
|
else
|
|
DarwinVers = 8; // Minimum supported darwin is Tiger.
|
|
} else if (TT.find("linux") != std::string::npos) {
|
|
// Linux doesn't imply ELF, but we don't currently support anything else.
|
|
TargetType = isELF;
|
|
IsLinux = true;
|
|
} else if (TT.find("cygwin") != std::string::npos) {
|
|
TargetType = isCygwin;
|
|
} else if (TT.find("mingw") != std::string::npos) {
|
|
TargetType = isMingw;
|
|
} else if (TT.find("win32") != std::string::npos) {
|
|
TargetType = isWindows;
|
|
} else if (TT.find("windows") != std::string::npos) {
|
|
TargetType = isWindows;
|
|
} else if (TT.find("-cl") != std::string::npos) {
|
|
TargetType = isDarwin;
|
|
DarwinVers = 9;
|
|
}
|
|
}
|
|
|
|
// If the asm syntax hasn't been overridden on the command line, use whatever
|
|
// the target wants.
|
|
if (AsmFlavor == X86Subtarget::Unset) {
|
|
AsmFlavor = (TargetType == isWindows)
|
|
? X86Subtarget::Intel : X86Subtarget::ATT;
|
|
}
|
|
|
|
// Stack alignment is 16 bytes on Darwin (both 32 and 64 bit) and for all 64
|
|
// bit targets.
|
|
if (TargetType == isDarwin || Is64Bit)
|
|
stackAlignment = 16;
|
|
|
|
if (StackAlignment)
|
|
stackAlignment = StackAlignment;
|
|
}
|