I'm looking into this issue and would like to ask for some advice.
I have added the following platform dependent functions.
int Parrot_math_isnan(double)
int Parrot_math_finite(double)
On Win32 the implementation is simple because the IEEE recommended
functions _finite and _isnan are supported. I'm thinking about adding a
test for these functions and use them. But what should happen if they
are not there?
Then I changed Parrot_sprintf_format in spf_render.c to use
Parrot_math_isnan and Parrot_math_finite to render "NaN", "-inf" and
"inf" directly.
Is this a good way to solve this?
Here's a sample (which should make its way into some tests):
>type test.pir
.sub main
# -INF
set N0, 0.0
ln N1, N0
print N1
print "\n"
# +INF
abs N2, N1
print N2
print "\n"
# NaN
set N3, -1.0
sqrt N4, N3
print N4
print "\n"
.end
# trunk
>parrot test.pir
-1.#INF00
1.#INF00
-1.#IND00
# local
>parrot test.pir
-inf
inf
NaN
Thanks,
Ron
