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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_acos.cpp
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@ -38,6 +38,7 @@
* Function needed: sqrt
*/
#include <cmath>
#include <float.h>
#include "math_private.h"
@ -87,13 +88,13 @@ __ieee754_acos(double x)
z = (one+x)*0.5;
p = z*(pS0+z*(pS1+z*(pS2+z*(pS3+z*(pS4+z*pS5)))));
q = one+z*(qS1+z*(qS2+z*(qS3+z*qS4)));
s = sqrt(z);
s = std::sqrt(z);
r = p/q;
w = r*s-pio2_lo;
return pi - 2.0*(s+w);
} else { /* x > 0.5 */
z = (one-x)*0.5;
s = sqrt(z);
s = std::sqrt(z);
df = s;
SET_LOW_WORD(df,0);
c = (z-df*df)/(s+df);