1 # 2 # Copyright (c) 2016 Google, Inc. 3 # 4 # This code is released under the libpng license. 5 # For conditions of distribution and use, see the disclaimer 6 # and license in png.h 7 # 8 9 # In order to compile Intel SSE optimizations for libpng, please add 10 # the following code to configure.ac under HOST SPECIFIC OPTIONS 11 # directly beneath the section for ARM. 12 13 # INTEL 14 # === 15 # 16 # INTEL SSE (SIMD) support. 17 18 AC_ARG_ENABLE([intel-sse], 19 AS_HELP_STRING([[[--enable-intel-sse]]], 20 [Enable Intel SSE optimizations: =no/off, yes/on:] 21 [no/off: disable the optimizations;] 22 [yes/on: enable the optimizations.] 23 [If not specified: determined by the compiler.]), 24 [case "$enableval" in 25 no|off) 26 # disable the default enabling: 27 AC_DEFINE([PNG_INTEL_SSE_OPT], [0], 28 [Disable Intel SSE optimizations]) 29 # Prevent inclusion of the assembler files below: 30 enable_intel_sse=no;; 31 yes|on) 32 AC_DEFINE([PNG_INTEL_SSE_OPT], [1], 33 [Enable Intel SSE optimizations]);; 34 *) 35 AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}: invalid value]) 36 esac]) 37 38 # Add Intel specific files to all builds where the host_cpu is Intel ('x86*') 39 # or where Intel optimizations were explicitly requested (this allows a 40 # fallback if a future host CPU does not match 'x86*') 41 AM_CONDITIONAL([PNG_INTEL_SSE], 42 [test "$enable_intel_sse" != 'no' && 43 case "$host_cpu" in 44 i?86|x86_64) :;; 45 *) test "$enable_intel_sse" != '';; 46 esac]) 47
