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Add cpu feature detection for generic arm/linux

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For platforms without runtime detection, assume whoever built it
with HAVE_NEON actually wanted it.
This commit is contained in:
Martin Storsjö 2014-03-01 01:51:59 +02:00
parent 9cf34e7615
commit d411d768b6
1 changed files with 33 additions and 2 deletions
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35
codec/common/cpu.cpp
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@ -38,6 +38,7 @@
*************************************************************************************
*/
#include <string.h>
#include <stdio.h>
#ifdef ANDROID_NDK
#include <cpu-features.h>
#endif
@ -258,9 +259,39 @@ uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors)
}
return uiCPU;
}
#else /* HAVE_NEON enabled but no runtime detection */
#elif defined(__linux__)
/* Generic arm/linux cpu feature detection */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
return 0;
FILE *f = fopen("/proc/cpuinfo", "r");
if (!f)
return 0;
char buf[200];
int flags = 0;
while (fgets(buf, sizeof(buf), f)) {
if (!strncmp(buf, "Features", strlen("Features"))) {
if (strstr(buf, " neon "))
flags |= WELS_CPU_NEON;
if (strstr(buf, " vfpv3 "))
flags |= WELS_CPU_VFPv3;
break;
}
}
fclose(f);
return flags;
}
#else /* HAVE_NEON enabled but no runtime detection */
/* No runtime feature detection available, but built with HAVE_NEON - assume
* that NEON and all associated features are available. */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
return WELS_CPU_ARMv7 |
WELS_CPU_VFPv3 |
WELS_CPU_NEON;
}
#endif
#else /* Neither X86_ASM nor HAVE_NEON */