2016-02-18 12:43:50 -05:00
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#
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# Copyright (c) 2016 Google, Inc.
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2016-02-19 10:46:51 -05:00
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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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# Copyright (c) 2004-2015 Glenn Randers-Pehrson
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#
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# Last changed in libpng 1.6.22 [(PENDING RELEASE)]
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2016-02-18 12:43:50 -05:00
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#
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# This code is released under the libpng license.
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# For conditions of distribution and use, see the disclaimer
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# and license in png.h
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#
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# In order to compile Intel SSE optimizations for libpng, please add
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# the following code to configure.ac under HOST SPECIFIC OPTIONS
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# directly beneath the section for ARM.
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# INTEL
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2016-02-19 10:46:51 -05:00
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# =====
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2016-02-18 12:43:50 -05:00
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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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