1 //===-- X86Subtarget.cpp - X86 Subtarget Information ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Nate Begeman and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the X86 specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #include "X86Subtarget.h"
15 #include "llvm/Module.h"
16 #include "X86GenSubtarget.inc"
19 static void GetCpuIDAndInfo(unsigned value, unsigned *EAX, unsigned *EBX,
20 unsigned *ECX, unsigned *EDX) {
21 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
23 asm ("pushl\t%%ebx\n\t"
25 "movl\t%%ebx, %%esi\n\t"
36 static const char *GetCurrentX86CPU() {
37 unsigned EAX = 0, EBX = 0, ECX = 0, EDX = 0;
38 GetCpuIDAndInfo(0x1, &EAX, &EBX, &ECX, &EDX);
39 unsigned Family = (EAX & (0xffffffff >> (32 - 4)) << 8) >> 8; // Bits 8 - 11
40 unsigned Model = (EAX & (0xffffffff >> (32 - 4)) << 4) >> 4; // Bits 4 - 7
41 GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
42 bool Em64T = EDX & (1 << 29);
51 case 4: return "pentium-mmx";
52 default: return "pentium";
57 case 1: return "pentiumpro";
60 case 6: return "pentium2";
64 case 11: return "pentium3";
66 case 13: return "pentium-m";
67 case 14: return "yonah";
68 default: return "i686";
74 return (Em64T) ? "nocona" : "prescott";
76 return (Em64T) ? "x86-64" : "pentium4";
85 X86Subtarget::X86Subtarget(const Module &M, const std::string &FS)
86 : stackAlignment(8), indirectExternAndWeakGlobals(false) {
88 // Determine default and user specified characteristics
89 std::string CPU = GetCurrentX86CPU();
91 // Parse features string.
92 ParseSubtargetFeatures(FS, CPU);
94 // Default to ELF unless otherwise specified.
97 // FIXME: Force these off until they work. An llc-beta option should turn
99 X86SSELevel = NoMMXSSE;
100 X863DNowLevel = NoThreeDNow;
102 // Set the boolean corresponding to the current target triple, or the default
103 // if one cannot be determined, to true.
104 const std::string& TT = M.getTargetTriple();
105 if (TT.length() > 5) {
106 if (TT.find("cygwin") != std::string::npos ||
107 TT.find("mingw") != std::string::npos)
108 TargetType = isCygwin;
109 else if (TT.find("darwin") != std::string::npos)
110 TargetType = isDarwin;
111 else if (TT.find("win32") != std::string::npos)
112 TargetType = isWindows;
113 } else if (TT.empty()) {
114 #if defined(__CYGWIN__) || defined(__MINGW32__)
115 TargetType = isCygwin;
116 #elif defined(__APPLE__)
117 TargetType = isDarwin;
118 #elif defined(_WIN32)
119 TargetType = isWindows;
123 if (TargetType == isDarwin) {
125 indirectExternAndWeakGlobals = true;