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[Bug rtl-optimization/12419] [3.3 Regression] Performance regression: poor optimization of const memory
- From: "jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Sep 2004 13:31:33 -0000
- Subject: [Bug rtl-optimization/12419] [3.3 Regression] Performance regression: poor optimization of const memory
- References: <20030926105501.12419.aph@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From jakub at gcc dot gnu dot org 2004-09-28 13:31 -------
I think 3.3 should probably stay as is.
RTX_UNCHANGING_P turned out to be a can of bugs, there were many changes in that
area in GCC 3.4 (and gcc-3_3-rhl-branch that has basically same code as 3.4 for
that) and there is no single safe patch that can be applied to 3.3.
Either we backport all RTX_UNCHANGING_P changes in 3.4 and exchange one set of
bugs with another one, or keep 3.3 as is.
HEAD got rid of RTX_UNCHANGING_P altogether, so there these kinds of bugs aren't
lurking anymore.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419