[Bug middle-end/21137] Convert (a >> 2) & 1 != 0 into a & 4 != 0

[phython at gcc dot gnu dot org]

------- Additional Comments From phython at gcc dot gnu dot org  2005-08-14 21:56 -------
 Actually, doing (a >> c1) & 2**c2 -> (a & (1<<c1+c2)) >> c1 looks worse, but
can be transformed into (a & (1<<c1+c2)) CMP c3 << c1.  However, I haven't
figure out the details of the second transformation.  There is a bug about it
though.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21137