https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292988
Bug ID: 292988
Summary: [libm] powl(x,y) gives the wrong result on x86_64.
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
The following code produces the wrong result.
/*
* This code yields an NaN when the result should be zero.
*/
#include <math.h>
#include <stdio.h>
int
main(void)
{
long double x = 0x1.98p-3072L;
long double y = 0xa.ab43b6dba9a6383p+16364L;
long double v;
v = powl(x, y);
printf("%.21Le\n%.21Le\n%.21Le\n", x, y, v);
return 0;
}
The bug was originally identified by Paul Zimmermann, and I've
confirmed his finding. I do not hack on libm functions, which
were imported from Cephus, so I cannot help with a patch.
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