-//===-- X86Subtarget.cpp - X86 Subtarget Information ------------*- C++ -*-===//
+//===-- X86Subtarget.cpp - X86 Subtarget Information ----------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// 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 "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/System/Host.h"
+#include "llvm/Support/Host.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/SmallVector.h"
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "X86GenSubtargetInfo.inc"
+
using namespace llvm;
#if defined(_MSC_VER)
/// 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;
/// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
/// to immediate address.
bool X86Subtarget::IsLegalToCallImmediateAddr(const TargetMachine &TM) const {
- if (Is64Bit)
+ if (In64BitMode)
return false;
return isTargetELF() || TM.getRelocationModel() == Reloc::Static;
}
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.
-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
- }
-}
-
void X86Subtarget::AutoDetectSubtargetFeatures() {
unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
union {
char c[12];
} text;
- if (GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1))
+ if (X86_MC::GetCpuIDAndInfo(0, &EAX, text.u+0, text.u+2, text.u+1))
return;
- GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
+ X86_MC::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;
+ if ((EDX >> 15) & 1) HasCMov = true; ToggleFeature(X86::FeatureCMOV);
+ if ((EDX >> 23) & 1) X86SSELevel = MMX; ToggleFeature(X86::FeatureMMX);
+ if ((EDX >> 25) & 1) X86SSELevel = SSE1; ToggleFeature(X86::FeatureSSE1);
+ if ((EDX >> 26) & 1) X86SSELevel = SSE2; ToggleFeature(X86::FeatureSSE2);
+ if (ECX & 0x1) X86SSELevel = SSE3; ToggleFeature(X86::FeatureSSE3);
+ if ((ECX >> 9) & 1) X86SSELevel = SSSE3; ToggleFeature(X86::FeatureSSSE3);
+ if ((ECX >> 19) & 1) X86SSELevel = SSE41; ToggleFeature(X86::FeatureSSE41);
+ if ((ECX >> 20) & 1) X86SSELevel = SSE42; ToggleFeature(X86::FeatureSSE42);
+ // FIXME: AVX codegen support is not ready.
+ //if ((ECX >> 28) & 1) { HasAVX = true; } ToggleFeature(X86::FeatureAVX);
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);
- HasAVX = ((ECX >> 28) & 0x1);
- HasAES = IsIntel && ((ECX >> 25) & 0x1);
+ HasCLMUL = IsIntel && ((ECX >> 1) & 0x1); ToggleFeature(X86::FeatureCLMUL);
+ HasFMA3 = IsIntel && ((ECX >> 12) & 0x1); ToggleFeature(X86::FeatureFMA3);
+ HasPOPCNT = IsIntel && ((ECX >> 23) & 0x1); ToggleFeature(X86::FeaturePOPCNT);
+ HasAES = IsIntel && ((ECX >> 25) & 0x1); ToggleFeature(X86::FeatureAES);
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_MC::DetectFamilyModel(EAX, Family, Model);
+ if (IsAMD || (Family == 6 && Model >= 13)) {
+ IsBTMemSlow = true;
+ ToggleFeature(X86::FeatureSlowBTMem);
+ }
// If it's Nehalem, unaligned memory access is fast.
- if (Family == 15 && Model == 26)
+ if (Family == 15 && Model == 26) {
IsUAMemFast = true;
+ ToggleFeature(X86::FeatureFastUAMem);
+ }
- GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
- HasX86_64 = (EDX >> 29) & 0x1;
- HasSSE4A = IsAMD && ((ECX >> 6) & 0x1);
- HasFMA4 = IsAMD && ((ECX >> 16) & 0x1);
+ X86_MC::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
+ if ((EDX >> 29) & 0x1) {
+ HasX86_64 = true;
+ ToggleFeature(X86::Feature64Bit);
+ }
+ if (IsAMD && ((ECX >> 6) & 0x1)) {
+ HasSSE4A = true;
+ ToggleFeature(X86::FeatureSSE4A);
+ }
+ if (IsAMD && ((ECX >> 16) & 0x1)) {
+ HasFMA4 = true;
+ ToggleFeature(X86::FeatureFMA4);
+ }
}
}
-X86Subtarget::X86Subtarget(const std::string &TT, const std::string &FS,
- bool is64Bit)
- : PICStyle(PICStyles::None)
+X86Subtarget::X86Subtarget(const std::string &TT, const std::string &CPU,
+ const std::string &FS,
+ unsigned StackAlignOverride, bool is64Bit)
+ : X86GenSubtargetInfo(TT, CPU, FS)
+ , PICStyle(PICStyles::None)
, X86SSELevel(NoMMXSSE)
, X863DNowLevel(NoThreeDNow)
, HasCMov(false)
, HasX86_64(false)
+ , HasPOPCNT(false)
, HasSSE4A(false)
, HasAVX(false)
, HasAES(false)
// 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;
-
+ , In64BitMode(is64Bit) {
// Determine default and user specified characteristics
- if (!FS.empty()) {
+ if (!FS.empty() || !CPU.empty()) {
+ std::string CPUName = CPU;
+ if (CPUName.empty()) {
+#if defined (__x86_64__) || defined(__i386__)
+ CPUName = sys::getHostCPUName();
+#else
+ CPUName = "generic";
+#endif
+ }
+
+ // 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";
+ }
+
// 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.
+ ParseSubtargetFeatures(CPUName, FullFS);
} 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;
+ // Make sure 64-bit features are available in 64-bit mode.
+ if (In64BitMode) {
+ HasX86_64 = true; ToggleFeature(X86::Feature64Bit);
+ HasCMov = true; ToggleFeature(X86::FeatureCMOV);
- // All 64-bit cpus have cmov support.
- HasCMov = true;
+ if (!HasAVX && X86SSELevel < SSE2) {
+ X86SSELevel = SSE2;
+ ToggleFeature(X86::FeatureSSE1);
+ ToggleFeature(X86::FeatureSSE2);
+ }
+ }
}
+
+ // 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);
+
+ if (HasAVX)
+ X86SSELevel = NoMMXSSE;
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, FreeBSD, Linux and Solaris (both
+ // 32 and 64 bit) and for all 64-bit targets.
+ if (StackAlignOverride)
+ stackAlignment = StackAlignOverride;
+ else if (isTargetDarwin() || isTargetFreeBSD() || isTargetLinux() ||
+ isTargetSolaris() || In64BitMode)
stackAlignment = 16;
-
- if (StackAlignment)
- stackAlignment = StackAlignment;
-}
-
-/// 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;
-
- 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;
- }
}
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