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opj_t1_decode_cblks(): tiny perf increase when loop unrolling

This commit is contained in:
Even Rouault 2016-05-23 10:25:55 +02:00
parent 1da397e94a
commit 93f7f90711
1 changed files with 12 additions and 1 deletions
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13
src/lib/openjp2/t1.c
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@ -1559,7 +1559,18 @@ OPJ_BOOL opj_t1_decode_cblks( opj_t1_t* t1,
if (tccp->qmfbid == 1) {
OPJ_INT32* restrict tiledp = &tilec->data[(OPJ_UINT32)y * tile_w + (OPJ_UINT32)x];
for (j = 0; j < cblk_h; ++j) {
for (i = 0; i < cblk_w; ++i) {
i = 0;
for (; i < (cblk_w & ~3); i += 4) {
OPJ_INT32 tmp0 = datap[(j * cblk_w) + i];
OPJ_INT32 tmp1 = datap[(j * cblk_w) + i+1];
OPJ_INT32 tmp2 = datap[(j * cblk_w) + i+2];
OPJ_INT32 tmp3 = datap[(j * cblk_w) + i+3];
((OPJ_INT32*)tiledp)[(j * tile_w) + i] = tmp0/2;
((OPJ_INT32*)tiledp)[(j * tile_w) + i+1] = tmp1/2;
((OPJ_INT32*)tiledp)[(j * tile_w) + i+2] = tmp2/2;
((OPJ_INT32*)tiledp)[(j * tile_w) + i+3] = tmp3/2;
}
for (; i < cblk_w; ++i) {
OPJ_INT32 tmp = datap[(j * cblk_w) + i];
((OPJ_INT32*)tiledp)[(j * tile_w) + i] = tmp/2;
}