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comparison src/cpuinfo/SDL_cpuinfo.c @ 787:07760c8854d1

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Date: Sat, 24 Jan 2004 14:49:58 +0100 From: Stephane Marchesin Subject: Re: [SDL] 3DNow! detection on a P4 system Well... I found another bug : 3dnow was detected on P2/P3 cpus. So I took one more look at the code and found a mistake in CPU_getCPUIDFeaturesExt : The condition for having extended cpuinfo is that when we query extended cpuinfo we get a result >= 0x80000001. So we must exit if eax < 0x80000001. The attached patch does that.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 24 Jan 2004 15:55:00 +0000
parents e1e0a0a94570
children c20f08c4f437
comparison
equal deleted inserted replaced
786:e1e0a0a94570 787:07760c8854d1
126 __asm__ ( 126 __asm__ (
127 " movl %%ebx,%%edi\n" 127 " movl %%ebx,%%edi\n"
128 " movl $0x80000000,%%eax # Query for extended functions \n" 128 " movl $0x80000000,%%eax # Query for extended functions \n"
129 " cpuid # Get extended function limit \n" 129 " cpuid # Get extended function limit \n"
130 " cmpl $0x80000001,%%eax \n" 130 " cmpl $0x80000001,%%eax \n"
131 " jbe 1f # Nope, we dont have function 800000001h\n" 131 " jl 1f # Nope, we dont have function 800000001h\n"
132 " movl $0x80000001,%%eax # Setup extended function 800000001h\n" 132 " movl $0x80000001,%%eax # Setup extended function 800000001h\n"
133 " cpuid # and get the information \n" 133 " cpuid # and get the information \n"
134 " movl %%edx,%0 \n" 134 " movl %%edx,%0 \n"
135 "1: \n" 135 "1: \n"
136 " movl %%edi,%%ebx\n" 136 " movl %%edi,%%ebx\n"
141 #elif defined(_MSC_VER) 141 #elif defined(_MSC_VER)
142 __asm { 142 __asm {
143 mov eax,80000000h ; Query for extended functions 143 mov eax,80000000h ; Query for extended functions
144 cpuid ; Get extended function limit 144 cpuid ; Get extended function limit
145 cmp eax,80000001h 145 cmp eax,80000001h
146 jbe done ; Nope, we dont have function 800000001h 146 jl done ; Nope, we dont have function 800000001h
147 mov eax,80000001h ; Setup extended function 800000001h 147 mov eax,80000001h ; Setup extended function 800000001h
148 cpuid ; and get the information 148 cpuid ; and get the information
149 mov features,edx 149 mov features,edx
150 done: 150 done:
151 } 151 }