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Speed dsp gain up slightly mostly with better code order

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8758 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Brandon Low 2006-02-20 23:52:47 +00:00
parent efd78238f6
commit d04dbca00b
1 changed files with 40 additions and 28 deletions
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68
apps/dsp.c
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@ -84,17 +84,25 @@
* to multiply with into x from s (and increase s); x must contain the
* initial value.
*/
#define FRACMUL_8_LOOP(x, y, s) \
({ \
long t; \
#define FRACMUL_8_LOOP_PART(x, s, d, y) \
{ \
long u; \
asm volatile ("mac.l %[a], %[b], (%[c])+, %[a], %%acc0\n\t" \
"move.l %%accext01, %[u]\n\t" \
"movclr.l %%acc0, %[t]\n\t" \
: [a] "+r" (x), [c] "+a" (s), [t] "=r" (t), [u] "=r" (u) \
"movclr.l %%acc0, %[t]" \
: [a] "+r" (x), [c] "+a" (s), [t] "=r" (d), [u] "=r" (u) \
: [b] "r" (y)); \
(t << 8) | (u & 0xff); \
})
d = (d << 8) | (u & 0xff); \
}
#define FRACMUL_8_LOOP(x, y, s, d) \
{ \
long t; \
FRACMUL_8_LOOP_PART(x, s, t, y); \
asm volatile ("move.l %[t],(%[d])+" \
: [d] "+a" (d)\
: [t] "r" (t)); \
}
#define ACC(acc, x, y) \
(void)acc; \
@ -118,11 +126,11 @@
#define GET_ACC(acc) acc
#define FRACMUL(x, y) (long) (((((long long) (x)) * ((long long) (y))) >> 31))
#define FRACMUL_8(x, y) (long) (((((long long) (x)) * ((long long) (y))) >> 23))
#define FRACMUL_8_LOOP(x, y, s) \
#define FRACMUL_8_LOOP(x, y, s, d) \
({ \
long t = x; \
x = *(s)++; \
(long) (((((long long) (t)) * ((long long) (y))) >> 23)); \
*(d)++ = (long) (((((long long) (t)) * ((long long) (y))) >> 23)); \
})
#endif
@ -695,36 +703,40 @@ static void eq_process(long **x, unsigned num)
* the src array if gain was applied.
* Note that this must be called before the resampler.
*/
static void apply_gain(long* src[], int count)
static void apply_gain(long* _src[], int _count)
{
if (dsp->replaygain)
struct dsp_config *my_dsp = dsp;
if (my_dsp->replaygain)
{
long** src = _src;
int count = _count;
long* s0 = src[0];
long* s1 = src[1];
long* d0 = &sample_buf[0];
long* d1 = (s0 == s1) ? d0 : &sample_buf[SAMPLE_BUF_SIZE / 2];
long gain = dsp->replaygain;
long gain = my_dsp->replaygain;
long s;
long i;
int i;
long *d;
src[0] = d0;
src[1] = d1;
s = *s0++;
for (i = 0; i < count; i++)
{
*d0++ = FRACMUL_8_LOOP(s, gain, s0);
}
if (src [0] != src [1])
if (s0 != s1)
{
d = &sample_buf[SAMPLE_BUF_SIZE / 2];
src[1] = d;
s = *s1++;
for (i = 0; i < count; i++)
{
*d1++ = FRACMUL_8_LOOP(s, gain, s1);
}
FRACMUL_8_LOOP(s, gain, s1, d);
}
else
{
src[1] = &sample_buf[0];
}
d = &sample_buf[0];
src[0] = d;
s = *s0++;
for (i = 0; i < count; i++)
FRACMUL_8_LOOP(s, gain, s0, d);
}
}