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-rw-r--r--cpu_mode_x86.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/cpu_mode_x86.c b/cpu_mode_x86.c
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+/* Determine CPU support for SIMD
+ * Copyright 2004 Phil Karn, KA9Q
+ */
+#include <stdio.h>
+#include "fec.h"
+
+/* 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){
+
+ int f;
+ if(Cpu_mode != UNKNOWN)
+ return;
+
+ /* Figure out what kind of CPU we have */
+ f = cpu_features();
+ if(f & (1<<26)){ /* SSE2 is present */
+ Cpu_mode = SSE2;
+ } else if(f & (1<<25)){ /* SSE is present */
+ Cpu_mode = SSE;
+ } else if(f & (1<<23)){ /* MMX is present */
+ Cpu_mode = MMX;
+ } else { /* No SIMD at all */
+ Cpu_mode = PORT;
+ }
+ fprintf(stderr,"SIMD CPU detect: %s\n",Cpu_modes[Cpu_mode]);
+}