http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55299



--- Comment #2 from olly at survex dot com 2012-11-13 20:40:06 UTC ---

Interestingly clang (at least 3.0-6 from Debian testing) fails to optimise the

same testcase but shifting by a constant.  For that variant case clang

generates essentially the same code as GCC currently does.

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