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[Bug tree-optimization/56286] New: vectorizer does not keep loop-closed SSA up-to-date
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 11 Feb 2013 12:45:00 +0000
- Subject: [Bug tree-optimization/56286] New: vectorizer does not keep loop-closed SSA up-to-date
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56286
Bug #: 56286
Summary: vectorizer does not keep loop-closed SSA up-to-date
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: rguenth@gcc.gnu.org
The vectorizer relies on the bug that cfgcleaup for no changed bbs from
fix_loop_structure rewrites the whole function into loop-closed-SSA again.
Loop-closed PHI node creation in vect_create_epilog_for_reduction does
not handle outer loop uses of the reduction result properly (those uses
are not yet vectorized). For example gcc.dg/pr50133.c.