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a46dd1ab7a
on powerpc64. Tested also on amd64. Hardware sponsored by IntegriCloud. PR: ports/235560 Submitted by: Piotr Kubaj <pkubaj@anongoth.pl>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
/* Determine CPU support for SIMD
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* Copyright 2004 Phil Karn, KA9Q
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*/
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#include <stdio.h>
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#include "fec.h"
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#ifdef __VEC__
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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/* Various SIMD instruction set names */
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char *Cpu_modes[] = {"Unknown","Portable C","x86 Multi Media Extensions (MMX)",
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"x86 Streaming SIMD Extensions (SSE)",
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"x86 Streaming SIMD Extensions 2 (SSE2)",
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"PowerPC G4/G5 Altivec/Velocity Engine"};
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enum cpu_mode Cpu_mode;
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void find_cpu_mode(void){
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int f;
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if(Cpu_mode != UNKNOWN)
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return;
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else
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Cpu_mode = PORT;
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#ifdef __i386__
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/* Figure out what kind of CPU we have */
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f = cpu_features();
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if(f & (1<<26)){ /* SSE2 is present */
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Cpu_mode = SSE2;
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} else if(f & (1<<25)){ /* SSE is present */
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Cpu_mode = SSE;
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} else if(f & (1<<23)){ /* MMX is present */
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Cpu_mode = MMX;
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}
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#endif
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#ifdef __VEC__
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{
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/* Ask the OS if we have Altivec support */
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#ifdef __APPLE__
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int selectors[2] = { CTL_HW, HW_VECTORUNIT };
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#endif
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int hasVectorUnit = 0;
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size_t length = sizeof(hasVectorUnit);
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#ifdef __APPLE__
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int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
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#elif __FreeBSD__
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int error = sysctlbyname("hw.altivec", &hasVectorUnit, &length, NULL, 0);
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#endif
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if(0 == error && hasVectorUnit)
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Cpu_mode = ALTIVEC;
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}
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#endif
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fprintf(stderr,"SIMD CPU detect: %s\n",Cpu_modes[Cpu_mode]);
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}
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