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Issue #1291 - Part 2: Stop using the lib's sqrt() function

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Use <cmath>'s functions over fdlibm's for performance reasons.
No significant precision loss when doing this.
This commit is contained in:
wolfbeast 2019-11-15 14:00:18 +01:00 • committed by Roy Tam
commit b6c0bdd7da
10 changed files with 17 additions and 459 deletions
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5
modules/fdlibm/src/s_asinh.cpp
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@ -24,6 +24,7 @@
* := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2)))
*/
#include <cmath>
#include <float.h>
#include "math_private.h"
@ -48,10 +49,10 @@ asinh(double x)
w = __ieee754_log(fabs(x))+ln2;
} else if (ix>0x40000000) { /* 2**28 > |x| > 2.0 */
t = fabs(x);
w = __ieee754_log(2.0*t+one/(__ieee754_sqrt(x*x+one)+t));
w = __ieee754_log(2.0*t+one/(std::sqrt(x*x+one)+t));
} else { /* 2.0 > |x| > 2**-28 */
t = x*x;
w =log1p(fabs(x)+t/(one+__ieee754_sqrt(one+t)));
w =log1p(fabs(x)+t/(one+std::sqrt(one+t)));
}
if(hx>0) return w; else return -w;
}