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[libpng16] Allow clang derived from older GCC versions to use ARM intrinsics.

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This commit is contained in:
John Bowler
2013-10-24 07:45:27 -05:00
committed by Glenn Randers-Pehrson
parent 393d3c8285
commit bb9adfdad9
3 changed files with 18 additions and 5 deletions
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9
pngpriv.h
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@@ -142,14 +142,19 @@
/* Put compiler specific checks below: */
#ifndef PNG_USE_ARM_NEON_ASM
# ifdef __GNUC__
# if defined(__clang__)
/* At present it is unknown by the libpng developers which versions of
* clang support the intrinsics, however some or perhaps all versions
* do not work with the assembler so this may be irrelevant.
*/
# elif defined(__GNUC__)
/* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to work,
* so if this *is* GCC, or G++, look for a version >4.5
*/
# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
# define PNG_USE_ARM_NEON_ASM
# endif
# endif
# endif /* __GNUC__ */
#endif
/* Is this a build of a DLL where compilation of the object modules requires