Author: post
Date: 2009-10-13 12:45:50 +0200 (Tue, 13 Oct 2009)
New Revision: 2707
Modified:
trunk/plugins/resample/resample.c
Log:
Resampler: Don't add fraction, since SSE2 conversion does this automatically.
Move constants out out loop.
Modified: trunk/plugins/resample/resample.c
===================================================================
--- trunk/plugins/resample/resample.c 2009-10-13 00:47:36 UTC (rev 2706)
+++ trunk/plugins/resample/resample.c 2009-10-13 10:45:50 UTC (rev 2707)
@@ -737,12 +737,13 @@
/* 24 pixels = 48 bytes/loop */
gint end_x_sse = (end_x/24)*24;
- /* Rounder after accumulation, half because input is scaled down */
- gint add_round_sub = (FPScale >> 2);
/* Subtract 32768 as it would appear after shift */
- add_round_sub -= (32768 << (FPScaleShift-1));
+ gint add_round_sub = (32768 << (FPScaleShift-1));
/* 0.5 pixel value is lost to rounding times fir_filter_size,
compensate */
add_round_sub += fir_filter_size * (FPScale >> 2);
+
+ __m128i add_32 = _mm_set_epi32(add_round_sub, add_round_sub,
add_round_sub, add_round_sub);
+ __m128i signxor = _mm_set_epi32(0x80008000, 0x80008000, 0x80008000,
0x80008000);
for (y = 0; y < new_size ; y++)
{
@@ -802,8 +803,6 @@
acc2 = _mm_add_epi32(acc2, src2i);
acc3 = _mm_add_epi32(acc3, src3i);
}
- __m128i add_32 = _mm_set_epi32(add_round_sub,
add_round_sub, add_round_sub, add_round_sub);
- __m128i signxor = _mm_set_epi32(0x80008000, 0x80008000,
0x80008000, 0x80008000);
/* Add rounder and subtract 32768 */
acc1_h = _mm_add_epi32(acc1_h, add_32);
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