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| author | Diego Pettenò <flameeyes@gmail.com> | 2008-10-16 13:34:09 +0000 |
|---|---|---|
| committer | Diego Pettenò <flameeyes@gmail.com> | 2008-10-16 13:34:09 +0000 |
| commit | be449fca79a3b0394143f0a77c99784e65868d9f (patch) | |
| tree | 5c5b2bbfe648467292b30cc501265e556acab101 /doc/optimization.txt | |
| parent | a14b362fc650a5e036d413033d9709a526662d89 (diff) | |
Convert asm keyword into __asm__.
Neither the asm() nor the __asm__() keyword is part of the C99
standard, but while GCC accepts the former in C89 syntax, it is not
accepted in C99 unless GNU extensions are turned on (with -fasm). The
latter form is accepted in any syntax as an extension (without
requiring further command-line options).
Sun Studio C99 compiler also does not accept asm() while accepting
__asm__(), albeit reporting warnings that it's not valid C99 syntax.
Originally committed as revision 15627 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'doc/optimization.txt')
| -rw-r--r-- | doc/optimization.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/optimization.txt b/doc/optimization.txt index a14116483d..50630e72ba 100644 --- a/doc/optimization.txt +++ b/doc/optimization.txt @@ -154,17 +154,17 @@ The minimum guaranteed alignment is written in the .h files, for example: General Tips: ------------- Use asm loops like: -asm( +__asm__( "1: .... ... "jump_instruciton .... Do not use C loops: do{ - asm( + __asm__( ... }while() -Use asm() instead of intrinsics. The latter requires a good optimizing compiler +Use __asm__() instead of intrinsics. The latter requires a good optimizing compiler which gcc is not. |