shithub: dav1d

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Improve wiener filter C implementation using loop interchange

--- a/src/looprestoration_tmpl.c

+++ b/src/looprestoration_tmpl.c

@@ -172,8 +172,8 @@

     const int round_bits_v = 11 - (bitdepth == 12) * 2;

     const int rounding_off_v = 1 << (round_bits_v - 1);

     const int round_offset = 1 << (bitdepth + (round_bits_v - 1));

-    for (int i = 0; i < w; i++) {

-        for (int j = 0; j < h; j++) {

+    for (int j = 0; j < h; j++) {

+        for (int i = 0; i < w; i++) {

             int sum = (hor[(j + 3) * REST_UNIT_STRIDE + i] << 7) - round_offset;

             for (int k = 0; k < 7; k++) {