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[Bug tree-optimization/36861] code generation regression with -O3
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 17 Jul 2008 18:01:44 -0000
- Subject: [Bug tree-optimization/36861] code generation regression with -O3
- References: <bug-36861-11487@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from rguenth at gcc dot gnu dot org 2008-07-17 18:01 -------
pointer_plus_2_bits will confuse points-to alias analysis galore. Of course
this doesn't explain the difference to -O0.
Still, -O1 is fast, -O1 -fstrict-aliasing is _very_ slow.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
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Keywords| |alias, missed-optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36861