On 2010-03-16 16:18:17 +0100, Richard Guenther wrote: > pow (a, 0.5) is always expanded to sqrt(a).
This violates the ISO C99 standard for -0.0. According to N1256, F.9.4.4: pow(±0, y) returns +0 for y > 0 and not an odd integer. So, pow(-0.0, 0.5) should return +0. But sqrt(-0.0) should return -0 according to the IEEE 754 standard (and F.9.4.5 from ISO C99). -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)
