46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
/* Determine CPU support for SIMD on Power PC
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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/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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};
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enum cpu_mode Cpu_mode;
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void find_cpu_mode(void)
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{
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if (Cpu_mode != UNKNOWN) {
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return;
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}
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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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int selectors[2] = { CTL_HW, HW_VECTORUNIT };
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int hasVectorUnit = 0;
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size_t length = sizeof(hasVectorUnit);
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int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
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if (0 == error && hasVectorUnit) {
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Cpu_mode = ALTIVEC;
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}
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else {
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Cpu_mode = PORT;
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}
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}
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#else
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Cpu_mode = PORT;
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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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