[Bug tree-optimization/31261] Missed tree optimizations: (8 - (x & 7)) & 7

[trt at acm dot org]

------- Comment #4 from trt at acm dot org  2007-03-21 18:28 -------
I think this could be generalized to more operators, e.g. 

     (y | (x & 7)) & 7
        ^ (bitwise or, xor, multiply, ...)

This optimization could be for "e & M" where e contains a subexpression of the
form "t & N" which can (sometimes) be simplified to "t".  I suppose that would
require walking the tree.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31261