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unroll shrinkh inner loop 

use VIPS_UNROLL for the inner loop, another 5% or so
This commit is contained in:
John Cupitt 2016-01-22 10:21:38 +00:00
parent dce70c82a5
commit 9b968491d3
1 changed files with 9 additions and 5 deletions
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14
libvips/resample/shrinkh.c
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@ -3,7 +3,7 @@
* 30/10/15
* - from shrink.c
* 22/1/16
* - reorganise loops, 30% faster
* - reorganise loops, 30% faster, vectorisable
*/
/*
@ -63,6 +63,10 @@ typedef VipsResampleClass VipsShrinkhClass;
G_DEFINE_TYPE( VipsShrinkh, vips_shrinkh, VIPS_TYPE_RESAMPLE );
#define INNER( BANDS ) \
sum += p[x1]; \
x1 += BANDS;
/* Integer shrink.
*/
#define ISHRINK( TYPE, BANDS ) { \
@ -74,8 +78,8 @@ G_DEFINE_TYPE( VipsShrinkh, vips_shrinkh, VIPS_TYPE_RESAMPLE );
int sum; \
\
sum = 0; \
for( x1 = b; x1 < ne; x1 += BANDS ) \
sum += p[x1]; \
x1 = b; \
VIPS_UNROLL( shrink->xshrink, INNER( BANDS ) ); \
q[b] = (sum + shrink->xshrink / 2) / \
shrink->xshrink; \
} \
@ -95,8 +99,8 @@ G_DEFINE_TYPE( VipsShrinkh, vips_shrinkh, VIPS_TYPE_RESAMPLE );
double sum; \
\
sum = 0.0; \
for( x1 = b; x1 < ne; x1 += bands ) \
sum += p[x1]; \
x1 = b; \
VIPS_UNROLL( shrink->xshrink, INNER( bands ) ); \
q[b] = sum / shrink->xshrink; \
} \
p += ne; \