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[Bug rtl-optimization/23837] [4.0 regression] Wrong code with REG_NO_CONFLICT notes (caused by combine)
- From: "amylaar at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Dec 2005 12:01:18 -0000
- Subject: [Bug rtl-optimization/23837] [4.0 regression] Wrong code with REG_NO_CONFLICT notes (caused by combine)
- References: <bug-23837-5724@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #36 from amylaar at gcc dot gnu dot org 2005-12-19 12:01 -------
While the patch will stop the bug from being triggered by the test case,
it does not fix th underlying combiner bug.
Any REG_NO_CONFLICT block could potentially be rendered invalid by an
inappropriate instruction combination. The REG_NO_CONFLICT note must be
removed
when such a combination is made.
--
amylaar at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23837