retitle 524472 gcc-4.3: gcc 4.3.2 strict-aliasing bug / miscompiles GMP 4.3.0
thanks
I've tracked down the bug and managed to write a simple testcase:
/* With GCC 4.3.2 and -O2 option: output value is 1 instead of 0.
* If -fno-strict-aliasing is added, this bug disappears.
*/
#include <stdio.h>
#include <stdlib.h>
int test (int n)
{
unsigned long *p, *q;
int i;
q = p = malloc (n * sizeof (unsigned long));
if (p == NULL)
return 2;
for (i = 0; i < n - 1; i++)
p[i] = 0;
p[n - 1] = 1;
while ((*(q++))-- == 0) ;
return p[n - 1] == 1;
}
int main (void)
{
int r;
r = test (17);
printf ("%d\n", r);
return r;
}
--
Vincent Lefèvre <vinc...@vinc17.org> - Web: <http://www.vinc17.org/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.org/blog/>
Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)
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