[Bug tree-optimization/45427] Number of iteration analysis bogus
rguenth at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Fri Aug 27 17:26:00 GMT 2010
------- Comment #6 from rguenth at gcc dot gnu dot org 2010-08-27 17:26 -------
You can see that analysis happening with the C testcase on unpatched trunk
when looking at the cunrolli dump at -O2 for example.
Analyzing # of iterations of loop 1
exit condition [p_4(D), + , 1](no_overflow) != 0B
bounds on difference of bases: -18446744073709551615 ... 0
result:
# of iterations -(long unsigned int) p_4(D), bounded by 0
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45427
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