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Merge pull request #808 from lovell/prefer-sqrt-to-pow-0.5

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Prefer ~10x faster sqrt instead of pow when y=0.5
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John Cupitt 2017-11-17 22:11:23 +00:00 committed by GitHub
commit cd898c52de
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1 changed files with 3 additions and 1 deletions
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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 )