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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_hypot.cpp
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@ -46,6 +46,7 @@
* than 1 ulps (units in the last place)
*/
#include <cmath>
#include <float.h>
#include "math_private.h"
@ -105,7 +106,7 @@ __ieee754_hypot(double x, double y)
t1 = 0;
SET_HIGH_WORD(t1,ha);
t2 = a-t1;
w = sqrt(t1*t1-(b*(-b)-t2*(a+t1)));
w = std::sqrt(t1*t1-(b*(-b)-t2*(a+t1)));
} else {
a = a+a;
y1 = 0;
@ -114,7 +115,7 @@ __ieee754_hypot(double x, double y)
t1 = 0;
SET_HIGH_WORD(t1,ha+0x00100000);
t2 = a - t1;
w = sqrt(t1*y1-(w*(-w)-(t1*y2+t2*b)));
w = std::sqrt(t1*y1-(w*(-w)-(t1*y2+t2*b)));
}
if(k!=0) {
u_int32_t high;