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[Bug tree-optimization/45216] Rotate expressions not recognized at tree level
- From: "steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Aug 2010 23:17:38 -0000
- Subject: [Bug tree-optimization/45216] Rotate expressions not recognized at tree level
- References: <bug-45216-179@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from steven at gcc dot gnu dot org 2010-08-06 23:17 -------
Related to PR17886, where it says that: "gcc can detect the (x << y)|(x >>
(bitwidth-y)) idiom for rotate and convert it into the machine rotate
instruction. But it only works when y is a constant and is not long long." But
apparently even this case is not detected anymore.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45216