Date: Mon, 13 Nov 2017 22:52:10 +0000 From: Khilan Gudka <Khilan.Gudka@cl.cam.ac.uk> To: freebsd-mips@freebsd.org Subject: fabs(-0.0) returns -0.0 Message-ID: <CAPJvC9X2T23qZhWra8J__Fuo6000nxb-w61q5=i%2BBHmpXfmdmA@mail.gmail.com>
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Hi,
The implementation of fabs(3) for MIPS (at least) appears to not be giving
the right answer for when -0 is passed, as it returns -0 instead of +0. The
implementation of fabs is:
double fabs(double x) {
if (x < 0)
return -x;
return x;
}
The if-test fails for -0 and thus it is returned. Is this a known issue? A
simple fix would be to return x+0.0 instead of just x.
The implication of this is that other functions which rely on fabs, such as
hypot, also return -0. For example, hypot(-0.0, 0.0) returns -0 instead of
+0.
Thanks,
Khilan
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