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//===-- X86Subtarget.cpp - X86 Subtarget Information ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Nate Begeman and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the X86 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#include "X86Subtarget.h"
#include "llvm/Module.h"
#include "X86GenSubtarget.inc"
using namespace llvm;
/// 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(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
#if defined(__GNUC__)
asm ("pushl\t%%ebx\n\t"
"cpuid\n\t"
"movl\t%%ebx, %%esi\n\t"
"popl\t%%ebx"
: "=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 const char *GetCurrentX86CPU() {
unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
if (GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX))
return "generic";
unsigned Family = (EAX & (0xffffffff >> (32 - 4)) << 8) >> 8; // Bits 8 - 11
unsigned Model = (EAX & (0xffffffff >> (32 - 4)) << 4) >> 4; // Bits 4 - 7
GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
bool Em64T = EDX & (1 << 29);
union {
unsigned u[3];
char c[12];
} text;
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";
default:
return (Model > 14) ? "yonah" : "i686";
}
case 15: {
switch (Model) {
case 3:
case 4:
return (Em64T) ? "nocona" : "prescott";
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:
switch (Model) {
case 5: return "athlon-fx"; // also opteron
default: return "athlon64";
}
default:
return "generic";
}
} else {
return "generic";
}
}
X86Subtarget::X86Subtarget(const Module &M, const std::string &FS) {
stackAlignment = 8;
// FIXME: this is a known good value for Yonah. Not sure about others.
MinRepStrSizeThreshold = 128;
X86SSELevel = NoMMXSSE;
X863DNowLevel = NoThreeDNow;
Is64Bit = false;
// Determine default and user specified characteristics
std::string CPU = GetCurrentX86CPU();
// Parse features string.
ParseSubtargetFeatures(FS, CPU);
// Default to ELF unless otherwise specified.
TargetType = isELF;
// Set the boolean corresponding to the current target triple, or the default
// if one cannot be determined, to true.
const std::string& TT = M.getTargetTriple();
if (TT.length() > 5) {
if (TT.find("cygwin") != std::string::npos ||
TT.find("mingw") != std::string::npos)
TargetType = isCygwin;
else if (TT.find("darwin") != std::string::npos)
TargetType = isDarwin;
else if (TT.find("win32") != std::string::npos)
TargetType = isWindows;
} else if (TT.empty()) {
#if defined(__CYGWIN__) || defined(__MINGW32__)
TargetType = isCygwin;
#elif defined(__APPLE__)
TargetType = isDarwin;
#elif defined(_WIN32)
TargetType = isWindows;
#endif
}
if (TargetType == isDarwin || TargetType == isCygwin)
stackAlignment = 16;
}
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