This patch does not seem to have measurable impact, at least on x86-64, though
there could be benefits for less than stellar branch predictors.
As such, the least useful of the series.
Tested with FATE.
Signed-off-by: Ganesh Ajjanagadde <gajjanaga...@gmail.com>
---
libavcodec/cbrt_tablegen.h | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/libavcodec/cbrt_tablegen.h b/libavcodec/cbrt_tablegen.h
index d3614d8..78a6b1f 100644
--- a/libavcodec/cbrt_tablegen.h
+++ b/libavcodec/cbrt_tablegen.h
@@ -45,11 +45,15 @@ static av_cold void AAC_RENAME(cbrt_tableinit)(void)
if (!cbrt_tab[(1<<13) - 1].i) {
cbrt_tab[0].f = 0;
int i;
- for (i = 0; i < 1<<13; i++) {
- if (!(i & 7))
- cbrt_tab[i].f = 16 * cbrt_tab[i>>3].f;
- else
- cbrt_tab[i].f = i * cbrt(i);
+ for (i = 0; i < 1<<13; i+=8) {
+ cbrt_tab[i].f = 16 * cbrt_tab[i>>3].f;
+ cbrt_tab[i+1].f = (i+1) * cbrt(i+1);
+ cbrt_tab[i+2].f = (i+2) * cbrt(i+2);
+ cbrt_tab[i+3].f = (i+3) * cbrt(i+3);
+ cbrt_tab[i+4].f = (i+4) * cbrt(i+4);
+ cbrt_tab[i+5].f = (i+5) * cbrt(i+5);
+ cbrt_tab[i+6].f = (i+6) * cbrt(i+6);
+ cbrt_tab[i+7].f = (i+7) * cbrt(i+7);
}
#if USE_FIXED
for (i = 0; i < 1<<13; i++) {
--
2.6.4
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