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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/e_acosh.cpp
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@ -29,6 +29,7 @@
* acosh(NaN) is NaN without signal.
*/
#include <cmath>
#include <float.h>
#include "math_private.h"
@ -55,9 +56,9 @@ __ieee754_acosh(double x)
return 0.0; /* acosh(1) = 0 */
} else if (hx > 0x40000000) { /* 2**28 > x > 2 */
t=x*x;
return __ieee754_log(2.0*x-one/(x+sqrt(t-one)));
return __ieee754_log(2.0*x-one/(x+std::sqrt(t-one)));
} else { /* 1<x<2 */
t = x-one;
return log1p(t+sqrt(2.0*t+t*t));
return log1p(t+std::sqrt(2.0*t+t*t));
}
}