Mercurial > sdl-ios-xcode
diff src/cpuinfo/SDL_cpuinfo.c @ 881:9eb85a211abd
Date: Tue, 30 Mar 2004 18:18:13 -0600
From: Tyler Montbriand
Subject: [SDL] Detecting Opteron CPU features
I can now get SDL_cpuinfo.c to detect the AMD Opteron's RDTSC, MMX, MMXEXT,
3DNOW, 3DNOWEXT, SSE, and SSE2 instruction set extensions under Linux. It
took one #ifdef'ed block of new asm code to account for the 64-bit flags
register, but the other two blocks worked fine without modification, just
needed to modify the #ifdef's a bit.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 11 Apr 2004 19:49:34 +0000 |
| parents | b2fda076b02e |
| children | b4b64bb88f2f |
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--- a/src/cpuinfo/SDL_cpuinfo.c Sun Apr 11 19:47:28 2004 +0000 +++ b/src/cpuinfo/SDL_cpuinfo.c Sun Apr 11 19:49:34 2004 +0000 @@ -81,6 +81,26 @@ : : "%eax", "%ecx" ); +#elif defined(__GNUC__) && defined(__x86_64__) +/* Technically, if this is being compiled under __x86_64__ then it has +CPUid by definition. But it's nice to be able to prove it. :) */ + __asm__ ( +" pushfq # Get original EFLAGS \n" +" popq %%rax \n" +" movq %%rax,%%rcx \n" +" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n" +" pushq %%rax # Save new EFLAGS value on stack \n" +" popfq # Replace current EFLAGS value \n" +" pushfq # Get new EFLAGS \n" +" popq %%rax # Store new EFLAGS in EAX \n" +" xorl %%ecx,%%eax # Can not toggle ID bit, \n" +" jz 1f # Processor=80486 \n" +" movl $1,%0 # We have CPUID support \n" +"1: \n" + : "=m" (has_CPUID) + : + : "%rax", "%rcx" + ); #elif defined(_MSC_VER) __asm { pushfd ; Get original EFLAGS @@ -103,7 +123,7 @@ static __inline__ int CPU_getCPUIDFeatures() { int features = 0; -#if defined(__GNUC__) && defined(i386) +#if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) ) __asm__ ( " movl %%ebx,%%edi\n" " xorl %%eax,%%eax # Set up for CPUID instruction \n" @@ -139,7 +159,7 @@ static __inline__ int CPU_getCPUIDFeaturesExt() { int features = 0; -#if defined(__GNUC__) && defined(i386) +#if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) ) __asm__ ( " movl %%ebx,%%edi\n" " movl $0x80000000,%%eax # Query for extended functions \n"