mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-27 06:35:30 +00:00
f5da13367f
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32333 91177308-0d34-0410-b5e6-96231b3b80d8
279 lines
8.2 KiB
C++
279 lines
8.2 KiB
C++
//===-- 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 "X86GenSubtarget.inc"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
using namespace llvm;
|
|
|
|
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));
|
|
|
|
|
|
/// True if accessing the GV requires an extra load. For Windows, dllimported
|
|
/// symbols are indirect, loading the value at address GV rather then the
|
|
/// value of GV itself. This means that the GlobalAddress must be in the base
|
|
/// or index register of the address, not the GV offset field.
|
|
bool X86Subtarget::GVRequiresExtraLoad(const GlobalValue* GV, bool isDirectCall) const
|
|
{
|
|
if (isTargetDarwin()) {
|
|
return (!isDirectCall &&
|
|
(GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
|
|
(GV->isExternal() && !GV->hasNotBeenReadFromBytecode())));
|
|
} else if (isTargetCygwin() || isTargetWindows()) {
|
|
return (GV->hasDLLImportLinkage());
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// 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__)
|
|
// 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(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;
|
|
}
|
|
|
|
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;
|
|
|
|
// FIXME: support for AMD family of processors.
|
|
if (memcmp(text.c, "GenuineIntel", 12) == 0) {
|
|
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;
|
|
|
|
X86::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
|
|
HasX86_64 = (EDX >> 29) & 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 = (EAX >> 8) & 0xf; // Bits 8 - 11
|
|
unsigned Model = (EAX >> 4) & 0xf; // Bits 4 - 7
|
|
X86::GetCpuIDAndInfo(0x80000001, &EAX, &EBX, &ECX, &EDX);
|
|
bool Em64T = (EDX >> 29) & 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: return "core2";
|
|
default: return "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, bool is64Bit)
|
|
: AsmFlavor(AsmWriterFlavor)
|
|
, X86SSELevel(NoMMXSSE)
|
|
, HasX86_64(false)
|
|
, stackAlignment(8)
|
|
// FIXME: this is a known good value for Yonah. How about others?
|
|
, MinRepStrSizeThreshold(128)
|
|
, Is64Bit(is64Bit)
|
|
, TargetType(isELF) { // Default to ELF unless otherwise specified.
|
|
|
|
// 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);
|
|
|
|
if (Is64Bit && !HasX86_64)
|
|
cerr << "Warning: Generation of 64-bit code for a 32-bit processor "
|
|
<< "requested.\n";
|
|
if (Is64Bit && X86SSELevel < SSE2)
|
|
cerr << "Warning: 64-bit processors all have at least SSE2.\n";
|
|
} else {
|
|
// Otherwise, use CPUID to auto-detect feature set.
|
|
AutoDetectSubtargetFeatures();
|
|
}
|
|
|
|
// If requesting codegen for X86-64, make sure that 64-bit and SSE2 features
|
|
// are enabled. These are available on all x86-64 CPUs.
|
|
if (Is64Bit) {
|
|
HasX86_64 = true;
|
|
if (X86SSELevel < SSE2)
|
|
X86SSELevel = SSE2;
|
|
}
|
|
|
|
// 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 the asm syntax hasn't been overridden on the command line, use whatever
|
|
// the target wants.
|
|
if (AsmFlavor == X86Subtarget::unset) {
|
|
if (TargetType == isWindows) {
|
|
AsmFlavor = X86Subtarget::intel;
|
|
} else {
|
|
AsmFlavor = X86Subtarget::att;
|
|
}
|
|
}
|
|
|
|
if (TargetType == isDarwin ||
|
|
TargetType == isCygwin ||
|
|
(TargetType == isELF && Is64Bit))
|
|
stackAlignment = 16;
|
|
}
|