pandory500/SDL-mirror
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Reduced the push/pop sequence to a single pair, and ported this fix over to the other architectures.

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404240
This commit is contained in:
Sam Lantinga 2009-11-30 21:04:25 +00:00
parent 604fbcb387
commit 3e860cdcf9
1 changed files with 16 additions and 16 deletions
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32
src/cpuinfo/SDL_cpuinfo.c
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@ -153,17 +153,17 @@ CPU_getCPUIDFeatures(void)
/* *INDENT-OFF* */
#if defined(__GNUC__) && defined(i386)
__asm__ (
" pushl %%ebx\n"
" xorl %%eax,%%eax # Set up for CPUID instruction \n"
" pushl %%ebx \n"
" cpuid # Get and save vendor ID \n"
" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
" jl 1f # We dont have the CPUID instruction\n"
" xorl %%eax,%%eax \n"
" incl %%eax \n"
" cpuid # Get family/model/stepping/features\n"
" popl %%ebx \n"
" movl %%edx,%0 \n"
"1: \n"
" popl %%ebx\n"
: "=m" (features)
:
: "%eax", "%ecx", "%edx"
@ -173,12 +173,10 @@ CPU_getCPUIDFeatures(void)
" xorl %%eax,%%eax # Set up for CPUID instruction \n"
" pushq %%rbx\n"
" cpuid # Get and save vendor ID \n"
" popq %%rbx\n"
" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
" jl 1f # We dont have the CPUID instruction\n"
" xorl %%eax,%%eax \n"
" incl %%eax \n"
" pushq %%rbx\n"
" cpuid # Get family/model/stepping/features\n"
" popq %%rbx\n"
" movl %%edx,%0 \n"
@ -190,32 +188,34 @@ CPU_getCPUIDFeatures(void)
#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
__asm {
xor eax, eax ; Set up for CPUID instruction
push ebx
cpuid ; Get and save vendor ID
cmp eax, 1 ; Make sure 1 is valid input for CPUID
jl done ; We dont have the CPUID instruction
xor eax, eax
inc eax
cpuid ; Get family/model/stepping/features
pop ebx
mov features, edx
done:
}
#elif defined(__sun) && (defined(__i386) || defined(__amd64))
__asm(
" movl %ebx,%edi\n"
" xorl %eax,%eax \n"
" pushl %ebx \n"
" cpuid \n"
" cmpl $1,%eax \n"
" jl 1f \n"
" xorl %eax,%eax \n"
" incl %eax \n"
" cpuid \n"
" popl %ebx \n"
#ifdef __i386
" movl %edx,-8(%ebp) \n"
#else
" movl %edx,-8(%rbp) \n"
#endif
"1: \n"
" movl %edi,%ebx\n" );
#endif
/* *INDENT-ON* */
return features;
@ -228,16 +228,16 @@ CPU_getCPUIDFeaturesExt(void)
/* *INDENT-OFF* */
#if defined(__GNUC__) && defined(i386)
__asm__ (
" pushl %%ebx\n"
" movl $0x80000000,%%eax # Query for extended functions \n"
" pushl %%ebx \n"
" cpuid # Get extended function limit \n"
" cmpl $0x80000001,%%eax \n"
" jl 1f # Nope, we dont have function 800000001h\n"
" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
" cpuid # and get the information \n"
" popl %%ebx \n"
" movl %%edx,%0 \n"
"1: \n"
" popl %%ebx\n"
: "=m" (features)
:
: "%eax", "%ecx", "%edx"
@ -245,15 +245,13 @@ CPU_getCPUIDFeaturesExt(void)
#elif defined(__GNUC__) && defined (__x86_64__)
__asm__ (
" movl $0x80000000,%%eax # Query for extended functions \n"
" pushq %%rbx\n"
" pushq %%rbx \n"
" cpuid # Get extended function limit \n"
" popq %%rbx\n"
" cmpl $0x80000001,%%eax \n"
" jl 1f # Nope, we dont have function 800000001h\n"
" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
" pushq %%rbx\n"
" cpuid # and get the information \n"
" popq %%rbx\n"
" popq %%rbx \n"
" movl %%edx,%0 \n"
"1: \n"
: "=m" (features)
@ -263,30 +261,32 @@ CPU_getCPUIDFeaturesExt(void)
#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
__asm {
mov eax,80000000h ; Query for extended functions
push ebx
cpuid ; Get extended function limit
cmp eax,80000001h
jl done ; Nope, we dont have function 800000001h
mov eax,80000001h ; Setup extended function 800000001h
cpuid ; and get the information
pop ebx
mov features,edx
done:
}
#elif defined(__sun) && ( defined(__i386) || defined(__amd64) )
__asm (
" movl %ebx,%edi\n"
" movl $0x80000000,%eax \n"
" pushl %ebx \n"
" cpuid \n"
" cmpl $0x80000001,%eax \n"
" jl 1f \n"
" movl $0x80000001,%eax \n"
" cpuid \n"
" popl %ebx \n"
#ifdef __i386
" movl %edx,-8(%ebp) \n"
" movl %edx,-8(%ebp) \n"
#else
" movl %edx,-8(%rbp) \n"
" movl %edx,-8(%rbp) \n"
#endif
"1: \n"
" movl %edi,%ebx\n"
);
#endif
/* *INDENT-ON* */