1 /* Determine CPU support for SIMD 2 * Copyright 2004 Phil Karn, KA9Q 3 */ 4 #include <stdio.h> 5 #include "fec.h" 6 7 /* Various SIMD instruction set names */ 8 char *Cpu_modes[] = {"Unknown","Portable C","x86 Multi Media Extensions (MMX)", 9 "x86 Streaming SIMD Extensions (SSE)", 10 "x86 Streaming SIMD Extensions 2 (SSE2)", 11 "PowerPC G4/G5 Altivec/Velocity Engine"}; 12 13 enum cpu_mode Cpu_mode; 14 15 void find_cpu_mode(void){ 16 17 int f; 18 if(Cpu_mode != UNKNOWN) 19 return; 20 21 /* Figure out what kind of CPU we have */ 22 f = cpu_features(); 23 if(f & (1<<26)){ /* SSE2 is present */ 24 Cpu_mode = SSE2; 25 } else if(f & (1<<25)){ /* SSE is present */ 26 Cpu_mode = SSE; 27 } else if(f & (1<<23)){ /* MMX is present */ 28 Cpu_mode = MMX; 29 } else { /* No SIMD at all */ 30 Cpu_mode = PORT; 31 } 32 fprintf(stderr,"SIMD CPU detect: %s\n",Cpu_modes[Cpu_mode]); 33 } 34
