[vlc-devel] [PATCH 09/16] ssse3: add deinterleaving macro and SSSE3 option

[Serg Chernyavskiy]

The same as with NEON. It would be great. Also autodetect unaligned access
and endianess (not on x86). It requires some work and good testing. For
instance, on my cortex-a7 target a test program sometimes just hangs (no
trap) attempting an unaligned 64 bit access. Other thoughts: 1) these days
most targets suitable for real-time high-bitrate processing of csa has
ssse3 and neon; 2) this library is only valuable as long as this version of
csa is in use.

2015-07-06 19:14 GMT+03:00 Jean-Baptiste Kempf <jb at videolan.org>:

> Can't we get autodetection at runtime, please?
>
> On 26 Jun, glenvt18 wrote :
> > ---
> >  configure.ac        |  5 +++++
> >  src/dvbcsa_bs.h     |  3 +++
> >  src/dvbcsa_bs_sse.h | 19 +++++++++++++++++++
> >  3 files changed, 27 insertions(+)
> >
> > diff --git a/configure.ac b/configure.ac
> > index 4dd0726..f978a02 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -13,6 +13,7 @@ AC_ARG_ENABLE(uint32, AC_HELP_STRING(--enable-uint32,
> [Use native 32 bits intege
> >  AC_ARG_ENABLE(uint64, AC_HELP_STRING(--enable-uint64, [Use native 64
> bits integers for bitslice]), enable_uint64=$enableval, enable_uint64=no)
> >  AC_ARG_ENABLE(mmx, AC_HELP_STRING(--enable-mmx, [Use MMX for
> bitslice]), mmx_debug=$enableval, enable_mmx=no)
> >  AC_ARG_ENABLE(sse2, AC_HELP_STRING(--enable-sse2, [Use SSE2 for
> bitslice]), sse2_debug=$enableval, enable_sse2=no)
> > +AC_ARG_ENABLE(ssse3, AC_HELP_STRING(--enable-ssse3, [Use SSSE3 for
> bitslice]), ssse3_debug=$enableval, enable_ssse3=no)
> >  AC_ARG_ENABLE(altivec, AC_HELP_STRING(--enable-altivec, [Use AltiVec
> for bitslice]), altivec_debug=$enableval, enable_altivec=no)
> >  AC_ARG_ENABLE(neon, AC_HELP_STRING(--enable-neon, [Use NEON for
> bitslice]), neon_debug=$enableval, enable_neon=no)
> >
> > @@ -47,6 +48,10 @@ elif test "$enable_sse2" = "yes" ; then
> >       AC_DEFINE(DVBCSA_USE_SSE, 1, Using SSE2 bitslice.)
> >       GCC_CFLAGS="$GCC_CFLAGS -msse -msse2"
> >
> > +elif test "$enable_ssse3" = "yes" ; then
> > +     AC_DEFINE(DVBCSA_USE_SSSE3, 1, Using SSSE3 bitslice.)
> > +     GCC_CFLAGS="$GCC_CFLAGS -mssse3"
> > +
> >  elif test "$enable_altivec" = "yes" ; then
> >       AC_DEFINE(DVBCSA_USE_ALTIVEC, 1, Using AltiVec bitslice.)
> >       GCC_CFLAGS="$GCC_CFLAGS -maltivec -mabi=altivec"
> > diff --git a/src/dvbcsa_bs.h b/src/dvbcsa_bs.h
> > index 7145048..8162405 100644
> > --- a/src/dvbcsa_bs.h
> > +++ b/src/dvbcsa_bs.h
> > @@ -40,6 +40,9 @@
> >  #elif defined(DVBCSA_USE_SSE)
> >  # include "dvbcsa_bs_sse.h"
> >
> > +#elif defined(DVBCSA_USE_SSSE3)
> > +# include "dvbcsa_bs_sse.h"
> > +
> >  #elif defined(DVBCSA_USE_ALTIVEC)
> >  # include "dvbcsa_bs_altivec.h"
> >
> > diff --git a/src/dvbcsa_bs_sse.h b/src/dvbcsa_bs_sse.h
> > index f1b0c79..02ecb1b 100644
> > --- a/src/dvbcsa_bs_sse.h
> > +++ b/src/dvbcsa_bs_sse.h
> > @@ -29,6 +29,10 @@
> >  #include <xmmintrin.h>
> >  #include <emmintrin.h>
> >
> > +#ifdef DVBCSA_USE_SSSE3
> > +#include <tmmintrin.h>
> > +#endif
> > +
> >  typedef __m128i dvbcsa_bs_word_t;
> >
> >  #define BS_BATCH_SIZE 128
> > @@ -54,4 +58,19 @@ typedef __m128i dvbcsa_bs_word_t;
> >
> >  #define BS_EMPTY()
> >
> > +#ifdef DVBCSA_USE_SSSE3
> > +/* block cipher 2-word load with byte-deinterleaving */
> > +#define BS_LOAD_DEINTERLEAVE_8(ptr, var_lo, var_hi) \
> > +      {\
> > +      dvbcsa_bs_word_t a, b; \
> > +      a = _mm_load_si128((ptr)); \
> > +      b = _mm_load_si128((ptr) + 1); \
> > +      a = _mm_shuffle_epi8(a,
> _mm_set_epi8(15,13,11,9,7,5,3,1,14,12,10,8,6,4,2,0)); \
> > +      b = _mm_shuffle_epi8(b,
> _mm_set_epi8(15,13,11,9,7,5,3,1,14,12,10,8,6,4,2,0)); \
> > +      var_lo = _mm_unpacklo_epi64(a, b); \
> > +      var_hi = _mm_unpackhi_epi64(a, b); \
> > +      }
> >  #endif
> > +
> > +#endif
> > +
> > --
> > 1.9.1
> >
> > _______________________________________________
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>
> --
> With my kindest regards,
>
> --
> Jean-Baptiste Kempf
> http://www.jbkempf.com/ - +33 672 704 734
> Sent from my Electronic Device
> _______________________________________________
> vlc-devel mailing list
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>
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