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add some colorspace conversion functions in NEON

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new file: lossless_neon.c
speedup is ~5%

gcc 4.6.3 seems to be doing some sub-optimal things here,
storing register on stack using 'vstmia' and such.
Looks similar to gcc.gnu.org/bugzilla/show_bug.cgi?id=51509

I've tried adding  -fno-split-wide-types and it does help
the generated assembly. But the overall speed gets worse with
this flag. We should only compile lossless_neon.c with it -> urk.

Change-Id: I2ccc0929f5ef9dfb0105960e65c0b79b5f18d3b0
This commit is contained in:
skal
2014-03-31 16:36:33 +02:00
parent daccbf400d
commit 97e5fac389
6 changed files with 96 additions and 1 deletions
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5
makefile.unix
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@ -69,6 +69,10 @@ EXTRA_FLAGS += -Wdeclaration-after-statement
EXTRA_FLAGS += -Wshadow
# EXTRA_FLAGS += -Wvla
# NEON-specific flags:
# EXTRA_FLAGS += -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a8
# -> seems to make the overall lib slower: -fno-split-wide-types
#### Nothing should normally be changed below this line ####
AR = ar
@ -105,6 +109,7 @@ DSP_DEC_OBJS = \
src/dsp/dec_neon.o \
src/dsp/dec_sse2.o \
src/dsp/lossless.o \
src/dsp/lossless_neon.o \
src/dsp/lossless_sse2.o \
src/dsp/upsampling.o \
src/dsp/upsampling_mips32.o \