[libpng16] Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).

ANNOUNCE

-Libpng 1.6.15beta03 - November 1, 2014
+Libpng 1.6.15beta03 - November 3, 2014
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -33,7 +33,8 @@ Version 1.6.15beta01 [October 29, 2014]
 Version 1.6.15beta02 [November 1, 2014]
   Changed remaining "if (!x)" to "if (x == 0)" and "if (x)" to "if (x !== 0)"
 
-Version 1.6.15beta03 [November 1, 2014]
+Version 1.6.15beta03 [November 3, 2014]
+  Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

CHANGES

@@ -5041,7 +5041,8 @@ Version 1.6.15beta01 [October 29, 2014]
 Version 1.6.15beta02 [November 1, 2014]
   Changed remaining "if (!x)" to "if (x == 0)" and "if (x)" to "if (x !== 0)"
 
-Version 1.6.15beta03 [November 1, 2014]
+Version 1.6.15beta03 [November 3, 2014]
+  Added PNG_USE_ARM_NEON configuration flag (Marcin Juszkiewicz).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit

configure.ac

@@ -283,17 +283,21 @@ AC_ARG_ENABLE([arm-neon],
    [case "$enableval" in
       no|off)
          # disable the default enabling on __ARM_NEON__ systems:
+         AC_DEFINE([PNG_USE_ARM_NEON], [], [ARM NEON support])
          AC_DEFINE([PNG_ARM_NEON_OPT], [0],
                    [Disable ARM Neon optimizations])
          # Prevent inclusion of the assembler files below:
          enable_arm_neon=no;;
       check)
+         AC_DEFINE([PNG_USE_ARM_NEON], [], [ARM NEON support])
          AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
                    [Check for ARM Neon support at run-time]);;
       api)
+         AC_DEFINE([PNG_USE_ARM_NEON], [], [ARM NEON support])
          AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
                    [Turn on ARM Neon optimizations at run-time]);;
       yes|on)
+         AC_DEFINE([PNG_USE_ARM_NEON], [], [ARM NEON support])
          AC_DEFINE([PNG_ARM_NEON_OPT], [2],
                    [Enable ARM Neon optimizations])
          AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api', if]

pngpriv.h

@@ -123,8 +123,8 @@
     * Note that gcc-4.9 defines __ARM_NEON instead of __ARM_NEON__, so we
     * check both variants.
     */
-#  if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
-   defined(PNG_ALIGNED_MEMORY_SUPPORTED)
+#  if defined(PNG_USE_ARM_NEON) && (defined(__ARM_NEON__) || \
+     defined(__ARM_NEON)) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
 #     define PNG_ARM_NEON_OPT 2
 #  else
 #     define PNG_ARM_NEON_OPT 0