GCC does stupid things if these assignments are done using floats
directly, so fill the runs using integer operations instead. Also
unroll the loops since the length is always a multiple of 4.
Originally committed as revision 20077 to svn://svn.ffmpeg.org/ffmpeg/trunk
{
int last_exp, n, code;
const uint16_t *ptr;
- float v, *q, max_scale, *q_end;
+ float v, max_scale;
+ uint32_t *q, *q_end, iv;
const float *ptab = pow_tab + 60;
+ const uint32_t *iptab = (const uint32_t*)ptab;
ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
- q = s->exponents[ch];
+ q = (uint32_t *)s->exponents[ch];
q_end = q + s->block_len;
max_scale = 0;
if (s->version == 1) {
last_exp = get_bits(&s->gb, 5) + 10;
v = ptab[last_exp];
+ iv = iptab[last_exp];
max_scale = v;
n = *ptr++;
do {
- *q++ = v;
- } while (--n);
+ *q++ = iv;
+ *q++ = iv;
+ *q++ = iv;
+ *q++ = iv;
+ } while (n -= 4);
}else
last_exp = 36;
if ((unsigned)last_exp + 60 > FF_ARRAY_ELEMS(pow_tab))
return -1;
v = ptab[last_exp];
+ iv = iptab[last_exp];
if (v > max_scale)
max_scale = v;
n = *ptr++;
do {
- *q++ = v;
- } while (--n);
+ *q++ = iv;
+ *q++ = iv;
+ *q++ = iv;
+ *q++ = iv;
+ } while (n -= 4);
}
s->max_exponent[ch] = max_scale;
return 0;