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[Bug optimization/11555] [3.4 Regression] ICE in verify_loop_structure, at cfgloop.c:1270
- From: "janis187 at us dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 23 Jul 2003 23:39:44 -0000
- Subject: [Bug optimization/11555] [3.4 Regression] ICE in verify_loop_structure, at cfgloop.c:1270
- References: <20030717002527.11555.v.haisman@sh.cvut.cz>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11555
janis187 at us dot ibm dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rakdver at atrey dot karlin
| |dot mff dot cuni dot cz
------- Additional Comments From janis187 at us dot ibm dot com 2003-07-23 23:39 -------
The regression in PR 11555 was introduced or exposed by this patch:
--- gcc/gcc/ChangeLog ---
2003-07-03 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
* cfglayout.c (cfg_layout_duplicate_bb): Do not update frequencies
at all if edge is not specified.
(can_copy_bbs_p, copy_bbs): New.
* cfglayout.h (can_copy_bbs_p, copy_bbs): Declare.
* cfgloop.c (get_loop_body): Comment more precisely.
* cfgloopmanip.c (copy_bbs, record_exit_edges): Removed.
(scale_bbs_frequencies): Fix comment typo.
(can_duplicate_loop_p): Use can_copy_bbs_p.
(duplicate_loop_to_header_edge): Simplify by using copy_bbs.
The regression hunt used the submitter's test case on i686-pc-linux-gnu
(note that currently the target is listed as i686-pc-cygwin) and the
options "-O1 -ftracer -funroll-loops".