libomsocoding: NEON viterbi acceleration
configure flag required to enable this: --enable-neon
Although autodetection according to __ARM_NEON would work because this
is only defined if the fpu is neon neon-fp16 neon-vfpv3 neon-vfpv4
neon-fp-armv8 crypto-neon-fp-armv8 doing that would lead to a unknown
performance impact, so it needs to be enabled manually.
Speedup is about ~1.3-1.5 on a unspecified single core Cortex A9. This
requires handling a special case for RACH with len 14 which is far too
short for neon and would actually incur a performance penalty of 25%.
Related: OS#4585
Change-Id: I58ff2cb4ce3514f43390ff0a2121f81e6a4983b5
diff --git a/src/Makefile.am b/src/Makefile.am
index 16119d9..be09784 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -48,6 +48,11 @@
endif
endif
+if HAVE_NEON
+libosmocore_la_SOURCES += conv_acc_neon.c
+# conv_acc_neon.lo : AM_CFLAGS += -mfpu=neon no, could as well be vfp with neon
+endif
+
BUILT_SOURCES = crc8gen.c crc16gen.c crc32gen.c crc64gen.c
EXTRA_DIST = conv_acc_sse_impl.h crcXXgen.c.tpl