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Use ~10x faster sqrt instead of pow when y=0.5

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This commit is contained in:
Lovell Fuller 2017-11-17 20:24:28 +00:00
parent ef9b23b95a
commit bb58685d1c
1 changed files with 3 additions and 1 deletions
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4
libvips/arithmetic/math2.c
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@ -139,7 +139,9 @@ vips_math2_build( VipsObject *object )
\
/* Division by zero! Difficult to report tho' \
*/ \
(Y) = (left == 0.0 && right < 0.0) ? 0.0 : pow( left, right ); \
(Y) = (right == 0.5) \
? sqrt( left ) \
: (left == 0.0 && right < 0.0) ? 0.0 : pow( left, right ); \
}
#define WOP( Y, X, E ) POW( Y, E, X )