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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;
// FIXME: temporary.
#include "llvm/Support/CommandLine.h"
namespace {
cl::opt<bool> EnableSSE("enable-x86-sse", cl::Hidden,
cl::desc("Enable sse on X86"));
}
/// 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 *EAX, unsigned *EBX,
unsigned *ECX, unsigned *EDX) {
#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" (*EAX),
"=S" (*EBX),
"=c" (*ECX),
"=d" (*EDX)
: "a" (value));
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);
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 "i686";
}
case 15: {
switch (Model) {
case 3:
case 4:
return (Em64T) ? "nocona" : "prescott";
default:
return (Em64T) ? "x86-64" : "pentium4";
}
}
default:
return "generic";
}
}
X86Subtarget::X86Subtarget(const Module &M, const std::string &FS) {
stackAlignment = 8;
indirectExternAndWeakGlobals = false;
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;
// FIXME: Force these off until they work. An llc-beta option should turn
// them back on.
if (!EnableSSE) {
X86SSELevel = NoMMXSSE;
X863DNowLevel = NoThreeDNow;
}
// 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) {
stackAlignment = 16;
indirectExternAndWeakGlobals = true;
}
}
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