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| author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2024-05-24 16:43:31 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2025-05-21 12:02:25 +0200 |
| commit | 2df9c8da72d59ff1be58ded85674d58d2ed69bdb (patch) | |
| tree | 2c2989af77f8cbe3cfebbd893b50a83f0756eaef | |
| parent | 4484e9b37307116647a2bd5b202cbff90c8e3cfc (diff) | |
| download | ffmpeg-2df9c8da72d59ff1be58ded85674d58d2ed69bdb.tar.gz | |
avcodec/e?ac3enc: Inform compiler about PutBitContext being blank
This turned out to be very beneficial: For GCC 13, the codesize
of ac3_output_frame_header went down from 4522B to 1247B and
from 10762B to 9298B for eac3_output_frame_header. For Clang 17,
the numbers went down from 3923B to 2477B and from 8338B to 6548B
(always with -O3).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
| -rw-r--r-- | libavcodec/ac3enc.c | 2 | ||||
| -rw-r--r-- | libavcodec/eac3enc.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index 3649289865..a1783577c5 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -1638,6 +1638,8 @@ static void ac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb) { AC3EncOptions *opt = &s->options; + put_bits_assume_flushed(pb); + put_bits(pb, 16, 0x0b77); /* frame header */ put_bits(pb, 16, 0); /* crc1: will be filled later */ put_bits(pb, 2, s->bit_alloc.sr_code); diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c index 3590b821a3..10b1ab337c 100644 --- a/libavcodec/eac3enc.c +++ b/libavcodec/eac3enc.c @@ -135,6 +135,8 @@ static void eac3_output_frame_header(AC3EncodeContext *s, PutBitContext *pb) int blk, ch; AC3EncOptions *opt = &s->options; + put_bits_assume_flushed(pb); + put_bits(pb, 16, 0x0b77); /* sync word */ /* BSI header */ |