------- Comment #3 from dickinsm at gmail dot com 2010-06-26 18:26 -------
Apologies; I seem to have messed up the original bug report, by accidentally
pasting a slightly edited version of the original bug file. The minimal
test-case is as follows:
#include <math.h>
#include <stdio.h>
int copysign_bug(double x)
{
if (x && (x * 0.5 == x)) // note the extra "x &&" here
return 1;
if (copysign(1.0, x) < 0.0)
return 2;
else
return 3;
}
int main(void) {
double x;
x = -0.0;
printf("copysign_bug(%.17g) = %d\n", x, copysign_bug(x));
x = 0.0;
printf("copysign_bug(%.17g) = %d\n", x, copysign_bug(x));
return 0;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44683
