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libavutil: document side effects of macros

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Christophe Gisquet 2014-07-10 20:49:06 +02:00 committed by Michael Niedermayer
parent 5e55c7e1bc
commit 8da1defe69
1 changed files with 8 additions and 0 deletions
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8
libavutil/intreadwrite.h
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@ -50,6 +50,14 @@ typedef union {
* AV_[RW][BLN](16|24|32|48|64) and AV_(COPY|SWAP|ZERO)(64|128) macros. * AV_[RW][BLN](16|24|32|48|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.
* Preprocessor symbols must be defined, even if these are implemented * Preprocessor symbols must be defined, even if these are implemented
* as inline functions. * as inline functions.
*
* R/W means read/write, B/L/N means big/little/native endianness.
* The following macros require aligned access, compared to their
* unaligned variants: AV_(COPY|SWAP|ZERO)(64|128), AV_[RW]N[8-64]A.
* Incorrect usage may range from abysmal performance to crash
* depending on the platform.
*
* The unaligned variants are AV_[RW][BLN][8-64] and AV_COPY*U.
*/ */
#ifdef HAVE_AV_CONFIG_H #ifdef HAVE_AV_CONFIG_H