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core: Add ARM NEON optimized sample conversion code

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final:
* includes some minor style fixes and build-time changes to allow
  building a single binary for neon and non-neon systems
v4:
* fix for sample length < 4
v3:
* convert from intrinsics to inline assembly
v2:
* load and store data with vld1/vld1q and vst1/vst1q, resp., to work
  around alignment issues of compiler-generated vldmia instruction
* remove redundant check for NEON flags

Ubuntu/Linaro gcc 4.6.3
arm-linux-gnueabi-gcc -O2 -mcpu=cortex-a8 -mfloat-abi=softfp -mfpu=neon

runtime on beagle-xm:

D: [pulseaudio] sconv_neon.c: checking NEON sconv_s16le_from_float
I: [pulseaudio] sconv_neon.c: NEON: 3754 usec.
I: [pulseaudio] sconv_neon.c: ref: 58594 usec.
D: [pulseaudio] sconv_neon.c: checking NEON sconv_s16le_to_float
I: [pulseaudio] sconv_neon.c: NEON: 1831 usec.
I: [pulseaudio] sconv_neon.c: ref: 10528 usec.
I: [pulseaudio] sconv_neon.c: Initialising ARM NEON optimized conversions.

conversion may be off by one for some samples due to rounding issues
This commit is contained in:
Peter Meerwald 2012-10-23 17:54:57 +02:00 • committed by Arun Raghavan
parent 4171df3019
commit 1319c4533a
6 changed files with 193 additions and 1 deletions
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10
src/Makefile.am
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@ -813,6 +813,7 @@ libpulsedsp_la_LDFLAGS = $(AM_LDFLAGS) -avoid-version -disable-static
###################################
lib_LTLIBRARIES += libpulsecore-@PA_MAJORMINOR@.la
noinst_LTLIBRARIES =
# Pure core stuff
libpulsecore_@PA_MAJORMINOR@_la_SOURCES = \
@ -870,6 +871,13 @@ libpulsecore_@PA_MAJORMINOR@_la_CFLAGS = $(AM_CFLAGS) $(SERVER_CFLAGS) $(LIBSAMP
libpulsecore_@PA_MAJORMINOR@_la_LDFLAGS = $(AM_LDFLAGS) -avoid-version
libpulsecore_@PA_MAJORMINOR@_la_LIBADD = $(AM_LIBADD) $(LIBLTDL) $(LIBSAMPLERATE_LIBS) $(LIBSPEEX_LIBS) $(LIBSNDFILE_LIBS) $(WINSOCK_LIBS) $(LTLIBICONV) libpulsecommon-@PA_MAJORMINOR@.la libpulse.la libpulsecore-foreign.la
if HAVE_NEON
noinst_LTLIBRARIES += libpulsecore_sconv_neon.la
libpulsecore_sconv_neon_la_SOURCES = pulsecore/sconv_neon.c
libpulsecore_sconv_neon_la_CFLAGS = $(AM_CFLAGS) $(NEON_CFLAGS)
libpulsecore_@PA_MAJORMINOR@_la_LIBADD += libpulsecore_sconv_neon.la
endif
if HAVE_ORC
ORC_SOURCE += pulsecore/svolume
libpulsecore_@PA_MAJORMINOR@_la_SOURCES += pulsecore/svolume_orc.c
@ -909,7 +917,7 @@ libpulsecore_@PA_MAJORMINOR@_la_SOURCES += pulsecore/database-simple.c
endif
# We split the foreign code off to not be annoyed by warnings we don't care about
noinst_LTLIBRARIES = libpulsecore-foreign.la
noinst_LTLIBRARIES += libpulsecore-foreign.la
libpulsecore_foreign_la_SOURCES = \
pulsecore/ffmpeg/resample2.c pulsecore/ffmpeg/avcodec.h pulsecore/ffmpeg/dsputil.h