/* Determine CPU support for SIMD on Power PC
 * Copyright 2004 Phil Karn, KA9Q
 */
#include <stdio.h>
#include "fec.h"
#ifdef __VEC__
#include <sys/sysctl.h>
#endif

/* Various SIMD instruction set names */
char *Cpu_modes[] = {"Unknown", "Portable C", "x86 Multi Media Extensions (MMX)",
                     "x86 Streaming SIMD Extensions (SSE)",
                     "x86 Streaming SIMD Extensions 2 (SSE2)",
                     "PowerPC G4/G5 Altivec/Velocity Engine"
                    };

enum cpu_mode Cpu_mode;

void find_cpu_mode(void)
{

  if (Cpu_mode != UNKNOWN) {
    return;
  }

#ifdef __VEC__
  {
    /* Ask the OS if we have Altivec support */
    int selectors[2] = { CTL_HW, HW_VECTORUNIT };
    int hasVectorUnit = 0;
    size_t length = sizeof(hasVectorUnit);
    int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
    if (0 == error && hasVectorUnit) {
      Cpu_mode = ALTIVEC;
    }
    else {
      Cpu_mode = PORT;
    }
  }
#else
  Cpu_mode = PORT;
#endif

  fprintf(stderr, "SIMD CPU detect: %s\n", Cpu_modes[Cpu_mode]);
}