[Bug middle-end/36359] missed optimization in some cases with PRE VRP and other passes combined together

[bunk at stusta dot de]

------- Comment #22 from bunk at stusta dot de  2009-01-25 22:05 -------
Check my comments #10 and #11 and the definition of ilog2() in
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=include/linux/log2.h;h=25b808631cd92c50d10cf6a31b2d9b9942b62ac9;hb=bce7f793daec3e65ec5c5705d2457b81fe7b5725
and you'll understand why I said 8 months ago "gcc has a bug regarding
__builtin_constant_p()".


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36359