[Bug tree-optimization/21827] unroll misses simple elimination - works with manual unroll

[martsummsw at hotmail dot com]

------- Comment #9 from martsummsw at hotmail dot com  2006-08-27 13:21 -------
Hmmm - I am (also) wrong when I claimed it was solved in 4.1.1. It is improved
since the example that goes wrong in #5 now is right, but it is just 
the limit (for when the compiler gets comfused) that is pushed a bit.

e.g.
for (int bp=0;bp<11;++bp) 
// Up to 11 is fine unrolled in gcc 4.1.1 

However 12 and above e.g.
for (int bp=0;bp<12;++bp) 
// this still produces the poor performing code


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21827