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avcodec/prosumer: Factorize the 2 loops in fill_elements()

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Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-09-22 18:13:59 +02:00
parent f24701b073
commit d3a9cb6bc8
1 changed files with 18 additions and 23 deletions
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41
libavcodec/prosumer.c
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@ -282,29 +282,24 @@ static void fill_elements(uint32_t idx, uint32_t shift, int size, uint32_t *e0,
{
uint32_t b, h = idx << (32 - shift);
for (int i = 0; i < size; i++) {
b = 4 * (table[2 * i + 1] & 0xF);
if (shift >= b && (h & (0xFFF00000u << (12 - b))) == (table[2 * i + 1] & 0xFFFF0000u)) {
if (table[2 * i] >> 8 == 0x80u) {
return;
} else {
*e1 = table[2 * i];
*e0 = (*e0 & 0xFFFFFFu) | (((12 + b - shift) & 0xFFFFFFFCu | 0x40u) << 22);
shift -= b;
h <<= b;
break;
}
}
}
for (int i = 0; i < size; i++) {
b = 4 * (table[2 * i + 1] & 0xF);
if (shift >= b && (h & (0xFFF00000u << (12 - b))) == (table[2 * i + 1] & 0xFFFF0000u)) {
if (table[2 * i] >> 8 == 0x80u) {
return;
} else {
*e1 |= table[2 * i] << 16;
*e0 = (*e0 & 0xFFFFFFu) | (((12 + b - shift) & 0xFFFFFFFCu | 0x80u) << 22);
break;
for (int j = 0; j < 2; j++) {
for (int i = 0; i < size; i++) {
b = 4 * (table[2 * i + 1] & 0xF);
if (shift >= b && (h & (0xFFF00000u << (12 - b))) == (table[2 * i + 1] & 0xFFFF0000u)) {
if (table[2 * i] >> 8 == 0x80u) {
return;
} else {
if (j == 0) {
*e1 = table[2 * i];
*e0 = (*e0 & 0xFFFFFFu) | (((12 + b - shift) & 0xFFFFFFFCu | 0x40u) << 22);
shift -= b;
h <<= b;
} else {
*e1 |= table[2 * i] << 16;
*e0 = (*e0 & 0xFFFFFFu) | (((12 + b - shift) & 0xFFFFFFFCu | 0x80u) << 22);
}
break;
}
}
}
}