2016-02-22 17:38:10 -05:00
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Enabling SSE support
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2016-02-18 23:17:46 -05:00
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2016-02-22 17:38:10 -05:00
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Copyright (c) 2016 Google, Inc.
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Written by Mike Klein and Matt Sarett
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2016-02-19 15:58:59 -05:00
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2016-02-22 17:38:10 -05:00
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To enable SSE support in libpng, apply intel_sse.patch in your build
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directory. If you prefer, manually edit configure.ac and Makefile.am,
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following the instructions below.
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Then configure libpng with -DPNG_INTEL_SSE in CPPFLAGS.
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If you only want to optimize 4bpp images, also use -DPNG_NO_INTEL_SSE_3BPP.
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If you have moved intel_init.c and filter_sse2_intrinsics.c to a different
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directory, be sure to update the '#include "../../pngpriv.h"' line in both
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files if necessary to point to the correct relative location of pngpriv.h
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with respect to the new location of those files.
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1. Insert the following lines above the copyright line near the top of
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configure.ac:
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-----------------cut----------------
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# Copyright (c) 2016 Google, Inc.
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# Written by Mike Klein and Matt Sarett
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# Derived from the ARM supporting code in libpng/configure.ac, which was
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-----------------cut----------------
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2. Add the following code to configure.ac under HOST SPECIFIC OPTIONS
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directly beneath the section for ARM:
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-----------------cut----------------
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# INTEL
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# =====
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#
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# INTEL SSE (SIMD) support.
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AC_ARG_ENABLE([intel-sse],
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AS_HELP_STRING([[[--enable-intel-sse]]],
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[Enable Intel SSE optimizations: =no/off, yes/on:]
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[no/off: disable the optimizations;]
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[yes/on: enable the optimizations.]
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[If not specified: determined by the compiler.]),
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[case "$enableval" in
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no|off)
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# disable the default enabling:
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AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
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[Disable Intel SSE optimizations])
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# Prevent inclusion of the assembler files below:
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enable_intel_sse=no;;
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yes|on)
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AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
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[Enable Intel SSE optimizations]);;
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*)
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AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value])
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esac])
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# Add Intel specific files to all builds where the host_cpu is Intel ('x86*')
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# or where Intel optimizations were explicitly requested (this allows a
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# fallback if a future host CPU does not match 'x86*')
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AM_CONDITIONAL([PNG_INTEL_SSE],
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[test "$enable_intel_sse" != 'no' &&
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case "$host_cpu" in
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i?86|x86_64) :;;
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*) test "$enable_intel_sse" != '';;
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esac])
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-----------------cut----------------
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3. Insert the following lines above the copyright line near the top of
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Makefile.am:
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-----------------cut----------------
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# Copyright (c) 2016 Google, Inc.
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# Written by Mike Klein and Matt Sarett
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# Derived from the ARM supporting code in libpng/configure.ac, which was
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-----------------cut----------------
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4. Add the following code to Makefile.am under HOST SPECIFIC OPTIONS
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directly beneath the "if PNG_ARM_NEON ... endif" statement:
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-----------------cut----------------
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if PNG_INTEL_SSE
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libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += contrib/intel/intel_init.c\
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contrib/intel/filter_sse2_intrinsics.c
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endif
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-----------------cut----------------
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