ref: 04c6c95577b32e31e534fa58b4e89e7433d4fc6f
parent: 2b038fa73b2b9ff2abef1e45f7e4db741835cf6e
author: Martin Storsjö <[email protected]>
date: Mon Jun 30 05:51:49 EDT 2014
Update the generic 32 bit arm linux cpu feature detection to support 64 bit kernels On 64 bit kernels, /proc/cpuinfo doesn't list the same old features as on 32 bit kernels, since most of them are mandatory on 64 bit arm systems, see [1] for details. If running a 32 bit arm binary on such a kernel, we need to detect the features slightly differently, either by using other names listed in the Features field on these devices, by checking the "CPU architecture" field and always enabling these if the architecture is >= 8, or by parsing /proc/self/auxv or using the getauxval function. [1] http://marc.info/?l=linux-arm-kernel&m=139087240101974
--- a/codec/common/src/cpu.cpp
+++ b/codec/common/src/cpu.cpp
@@ -258,9 +258,10 @@
int flags = 0;
while (fgets (buf, sizeof (buf), f)) { if (!strncmp (buf, "Features", strlen ("Features"))) {- if (strstr (buf, " neon "))
+ // The asimd and fp features are listed on 64 bit ARMv8 kernels
+ if (strstr (buf, " neon ") || strstr(buf, " asimd "))
flags |= WELS_CPU_NEON;
- if (strstr (buf, " vfpv3 "))
+ if (strstr (buf, " vfpv3 ") || strstr(buf, " fp "))
flags |= WELS_CPU_VFPv3;
break;
}