[Bug tree-optimization/42142] [4.5 Regression] DCE miscompiles a certain quicksort implementation when optimizing with -O1 or higher

[rguenth at gcc dot gnu dot org]

------- Comment #8 from rguenth at gcc dot gnu dot org  2009-11-24 11:57 -------
Subject: Bug 42142

Author: rguenth
Date: Tue Nov 24 11:57:26 2009
New Revision: 154494

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=154494
Log:
2009-11-24  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/42142
        * tree-ssa-dce.c (mark_aliased_reaching_defs_necessary_1):
        Handle iv-dependent (non-)kills properly.
        (mark_aliased_reaching_defs_necessary): Pass the basic-block
        of the reference statement to mark_aliased_reaching_defs_necessary_1.

        * gcc.c-torture/execute/pr42142.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.c-torture/execute/pr42142.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-dce.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42142