[Bug c/59017] Infinite loop introduced in program with -O2 or -O3 on Mageia Linux x86-64 Cauldron with gcc-4.8.2
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Nov 6 11:44:00 GMT 2013
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59017
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
-fno-aggressive-loop-optimizations fixes this. On trunk I get
t.c: In function 'main':
t.c:59:29: warning: iteration 200000u invokes undefined behavior
[-Waggressive-loop-optimizations]
x_count += c5_counts[LIM_min_x-1]-c5_counts[x+1];
^
t.c:35:5: note: containing loop
for(int x = 0; x <= LIM; x++)
^
clearly x+1 is out-of bounds for x == LIM.
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