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Date: Tue, 30 Mar 2004 18:18:13 -0600

Browse source 
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.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40882
This commit is contained in:
Sam Lantinga 2004-04-11 19:49:34 +00:00
parent b078fb1950
commit b310759c40
1 changed files with 22 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

24
src/cpuinfo/SDL_cpuinfo.c
View file

@ -81,6 +81,26 @@ static __inline__ int CPU_haveCPUID()
: :
: "%eax", "%ecx" : "%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) #elif defined(_MSC_VER)
__asm { __asm {
pushfd ; Get original EFLAGS pushfd ; Get original EFLAGS
@ -103,7 +123,7 @@ done:
static __inline__ int CPU_getCPUIDFeatures() static __inline__ int CPU_getCPUIDFeatures()
{ {
int features = 0; int features = 0;
#if defined(__GNUC__) && defined(i386) #if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )
__asm__ ( __asm__ (
" movl %%ebx,%%edi\n" " movl %%ebx,%%edi\n"
" xorl %%eax,%%eax # Set up for CPUID instruction \n" " xorl %%eax,%%eax # Set up for CPUID instruction \n"
@ -139,7 +159,7 @@ done:
static __inline__ int CPU_getCPUIDFeaturesExt() static __inline__ int CPU_getCPUIDFeaturesExt()
{ {
int features = 0; int features = 0;
#if defined(__GNUC__) && defined(i386) #if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )
__asm__ ( __asm__ (
" movl %%ebx,%%edi\n" " movl %%ebx,%%edi\n"
" movl $0x80000000,%%eax # Query for extended functions \n" " movl $0x80000000,%%eax # Query for extended functions \n"