1/* Determine CPU support for SIMD on Power PC
2 * Copyright 2004 Phil Karn, KA9Q
3 */
4#include <stdio.h>
5#include "fec.h"
6#ifdef __VEC__
7#include <sys/sysctl.h>
8#endif
9
10/* Various SIMD instruction set names */
11char *Cpu_modes[] = {"Unknown","Portable C","x86 Multi Media Extensions (MMX)",
12		   "x86 Streaming SIMD Extensions (SSE)",
13		   "x86 Streaming SIMD Extensions 2 (SSE2)",
14		   "PowerPC G4/G5 Altivec/Velocity Engine"};
15
16enum cpu_mode Cpu_mode;
17
18void find_cpu_mode(void){
19
20  if(Cpu_mode != UNKNOWN)
21    return;
22
23#ifdef __VEC__
24  {
25  /* Ask the OS if we have Altivec support */
26  int selectors[2] = { CTL_HW, HW_VECTORUNIT };
27  int hasVectorUnit = 0;
28  size_t length = sizeof(hasVectorUnit);
29  int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
30  if(0 == error && hasVectorUnit)
31    Cpu_mode = ALTIVEC;
32  else
33    Cpu_mode = PORT;
34  }
35#else
36  Cpu_mode = PORT;
37#endif
38
39  fprintf(stderr,"SIMD CPU detect: %s\n",Cpu_modes[Cpu_mode]);
40}
41