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Even more fixes for alpha Tru64, this time for 

the phase and polar methods.
This commit is contained in:
Mark Dickinson 2008-04-20 18:30:05 +00:00
parent 2cede399ec
commit c632301bd4
1 changed files with 10 additions and 1 deletions
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11
Modules/cmathmodule.c
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@ -264,7 +264,8 @@ c_atan(Py_complex z)
return r;
}
/* Windows screws up atan2 for inf and nan */
/* Windows screws up atan2 for inf and nan, and alpha Tru64 5.1 doesn't follow
C99 for atan2(0., 0.). */
static double
c_atan2(Py_complex z)
{
@ -282,6 +283,14 @@ c_atan2(Py_complex z)
/* atan2(+-inf, x) == +-pi/2 for finite x */
return copysign(0.5*Py_MATH_PI, z.imag);
}
if (Py_IS_INFINITY(z.real) || z.imag == 0.) {
if (copysign(1., z.real) == 1.)
/* atan2(+-y, +inf) = atan2(+-0, +x) = +-0. */
return copysign(0., z.imag);
else
/* atan2(+-y, -inf) = atan2(+-0., -x) = +-pi. */
return copysign(Py_MATH_PI, z.imag);
}
return atan2(z.imag, z.real);
}