| Bill Yi | 4e213d5 | 2015-06-23 13:53:11 -0700 | [diff] [blame] | 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 | } |