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mixer: remove alloca() from elem_read_route()

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Both of alloca() and automatic variables keep storages on stack, while
the former generates more instructions than the latter. It's better to use
the latter if the size of storage is computable at pre-compile or compile
time; i.e. just for structures.

This commit obsolete usages of alloca() with automatic variables.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2016-07-15 09:23:09 +09:00 • committed by Takashi Iwai
parent b67b9e42ca
commit bf059f00be
1 changed files with 3 additions and 4 deletions
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7
src/mixer/simple_none.c
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@ -271,18 +271,17 @@ static int elem_read_switch(selem_none_t *s, int dir, selem_ctl_type_t type)
static int elem_read_route(selem_none_t *s, int dir, selem_ctl_type_t type)
{
snd_ctl_elem_value_t *ctl;
snd_ctl_elem_value_t ctl = {0};
unsigned int idx;
int err;
selem_ctl_t *c = &s->ctls[type];
snd_ctl_elem_value_alloca(&ctl);
if ((err = snd_hctl_elem_read(c->elem, ctl)) < 0)
if ((err = snd_hctl_elem_read(c->elem, &ctl)) < 0)
return err;
for (idx = 0; idx < s->str[dir].channels; idx++) {
unsigned int idx1 = idx;
if (idx >= c->values)
idx1 = 0;
if (!snd_ctl_elem_value_get_integer(ctl,
if (!snd_ctl_elem_value_get_integer(&ctl,
idx1 * c->values + idx1))
s->str[dir].sw &= ~(1 << idx);
}