[Bug tree-optimization/18694] [4.0 regression] loop miscompilation at -O1 (-ftree-ch)
------- Additional Comments From kazu at cs dot umass dot edu 2004-12-09 05:24 -------
Updated the testcase like so:
/* PR tree-optimization/18694
The dominator optimization didn't take the PHI evaluation order
into account when threading an edge. */
extern void abort (void) __attribute__((noreturn));
extern void exit (int) __attribute__((noreturn));
void __attribute__((noinline))
foo (int i)
{
int next_n = 1;
int j = 0;
for (; i != 0; i--)
{
int n;
for (n = next_n; j < n; j++)
next_n++;
if (j != n)
abort ();
}
}
int
main (void)
{
foo (2);
exit (0);
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18694
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