diff options
Diffstat (limited to 'common/threads.h')
| -rw-r--r-- | common/threads.h | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/common/threads.h b/common/threads.h index 1cdb5d8f..59fccd12 100644 --- a/common/threads.h +++ b/common/threads.h @@ -2,10 +2,13 @@ #define AL_THREADS_H #if defined(__GNUC__) && defined(__i386__) -/* force_align_arg_pointer is required for proper function arguments aligning - * when SSE code is used. Some systems (Windows, QNX) do not guarantee our - * thread functions will be properly aligned on the stack, even though GCC may - * generate code with the assumption that it is. */ +/* force_align_arg_pointer may be required for proper stack alignment when SSE + * code is used. GCC generates code with the assumption the stack pointer is + * suitably aligned, while some systems (Windows, QNX) do not guarantee non- + * exported functions will be properly aligned when called externally, and + * older apps for other systems may have been built with a lower stack + * alignment than expected by newer builds. + */ #define FORCE_ALIGN __attribute__((force_align_arg_pointer)) #else #define FORCE_ALIGN |