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Add attribute that forces alignment of stack to functions that need it. 

Necessary for systems that don't align by default to 16 bytes, required by some
SSE instructions.
Requires GCC >= 4.2.
Based on patch by Gaël Chardon.

Originally committed as revision 10106 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2007-08-13 15:28:29 +00:00
parent 345bb2ad90
commit 5e4c7ca224
5 changed files with 17 additions and 8 deletions
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3
libavcodec/dsputil.c
View File

@ -3833,7 +3833,8 @@ int ff_check_alignment(void){
av_log(NULL, AV_LOG_ERROR,
"Compiler did not align stack variables. Libavcodec has been miscompiled\n"
"and may be very slow or crash. This is not a bug in libavcodec,\n"
"but in the compiler. Do not report crashes to FFmpeg developers.\n");
"but in the compiler. You may try recompiling using gcc >= 4.2.\n"
"Do not report crashes to FFmpeg developers.\n");
#endif
did_fail=1;
}

2
libavcodec/pthread.c
View File

@ -42,7 +42,7 @@ typedef struct ThreadContext {
int done;
} ThreadContext;
static void* worker(void *v)
static void* attribute_align_arg worker(void *v)
{
AVCodecContext *avctx = v;
ThreadContext *c = avctx->thread_opaque;

10
libavcodec/utils.c
View File

@ -829,7 +829,7 @@ AVFrame *avcodec_alloc_frame(void){
return pic;
}
int avcodec_open(AVCodecContext *avctx, AVCodec *codec)
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
int ret= -1;
@ -880,7 +880,7 @@ end:
return ret;
}
int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const short *samples)
{
if(buf_size < FF_MIN_BUFFER_SIZE && 0){
@ -895,7 +895,7 @@ int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
return 0;
}
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVFrame *pict)
{
if(buf_size < FF_MIN_BUFFER_SIZE){
@ -923,7 +923,7 @@ int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
return ret;
}
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
int *got_picture_ptr,
uint8_t *buf, int buf_size)
{
@ -946,7 +946,7 @@ int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
return ret;
}
int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
int *frame_size_ptr,
uint8_t *buf, int buf_size)
{

2
libavcodec/w32thread.c
View File

@ -36,7 +36,7 @@ typedef struct ThreadContext{
}ThreadContext;
static unsigned __stdcall thread_func(void *v){
static unsigned __stdcall attribute_align_arg thread_func(void *v){
ThreadContext *c= v;
for(;;){

8
libavutil/internal.h
View File

@ -34,6 +34,14 @@
#include <stddef.h>
#include <assert.h>
#ifndef attribute_align_arg
#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
# define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
# define attribute_align_arg
#endif
#endif
#ifndef attribute_used
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define attribute_used __attribute__((used))