1 files changed, 50 insertions, 0 deletions

diff --git a/comms/libfec/files/cpu_mode.c b/comms/libfec/files/cpu_mode.c
new file mode 100644
index 000000000000..089c416c2e9c
--- /dev/null
+++ b/comms/libfec/files/cpu_mode.c
@@ -0,0 +1,50 @@
+/* Determine CPU support for SIMD
+ * 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){
+
+  int f;
+  if(Cpu_mode != UNKNOWN)
+    return;
+  else
+    Cpu_mode = PORT;
+#ifdef __i386__
+  /* 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;
+  }
+#endif
+//#ifdef __VEC__
+#if 0
+// This looks very Linux specific
+  {
+  /* 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;
+  }
+#endif
+  fprintf(stderr,"SIMD CPU detect: %s\n",Cpu_modes[Cpu_mode]);
+}