From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <615bb2c21f211025b5d9aba799fffe0d@terzarima.net>
From: Charles Forsyth <forsyth@terzarima.net>
Date: Tue,  1 Dec 2009 16:31:14 +0000
To: 9fans@9fans.net
In-Reply-To: <aa38aea3812634942ec2e361c5552c87@brasstown.quanstro.net>
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Subject: Re: [9fans] compiler double bug.
Topicbox-Message-UUID: a61b2c8e-ead5-11e9-9d60-3106f5b1d025

#include <u.h>
#include <libc.h>

void
main(void)
{
	double g = 4215866817.;

	print("%d\n", (unsigned int)g);
	print("%d\n", (unsigned int)g);
	exits("");
}
8c r.c
8l r.8
./8.out
-79100479
-79100479

no trap. it generates different code.
(obviously the %d should be %ud in this case, giving

doppio% 8.out
4215866817
4215866817

which looks like the right answer

the cast must be to an unsigned integer.
otherwise the resulting range is signed,
and that's more limited