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pcm: another fix for the snd_pcm_area_silence() fast path

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The 64-bit fast path can be used only in limited conditions:

- destination must be aligned to 64-bit (CPU aligned access)
- step must be equal to width
- physical with must be different than 24 (cannot be multiplied to 64)

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2018-02-05 14:59:12 +01:00
parent 36decd209f
commit af531606b7
1 changed files with 3 additions and 1 deletions
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4
src/pcm/pcm.c
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@ -2951,7 +2951,9 @@ int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_area, snd_pcm_uframes
* Iterate copying silent sample for sample data aligned to 64 bit.
* This is a fast path.
*/
if (dst_area->step == (unsigned int) width && (64 % width) == 0) {
if (dst_area->step == (unsigned int) width &&
width != 24 &&
((intptr_t)dst & 7) == 0) {
unsigned int dwords = samples * width / 64;
uint64_t *dstp = (uint64_t *)dst;
samples -= dwords * 64 / width;