[Bug tree-optimization/71866] [7 Regression] gcc locks up after fix for PR70159
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Jul 14 12:16:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71866
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jul 14 12:15:38 2016
New Revision: 238334
URL: https://gcc.gnu.org/viewcvs?rev=238334&root=gcc&view=rev
Log:
2016-07-14 Richard Biener <rguenther@suse.de>
PR tree-optimization/71866
* tree-ssa-pre.c (get_constant_for_value_id): Remove.
(do_hoist_insertion): Avoid endless recursion when we
didn't insert anything because we managed to simplify
things down to a constant or SSA name.
(fully_constant_expression): Re-write in terms of ...
* tree-ssa-sccvn.h (vn_nary_simplify): ... this. Declare.
* tree-ssa-sccvn.c (vn_nary_simplify): New wrapper around
vn_nary_build_or_lookup_1.
(vn_nary_build_or_lookup_1): Added flag and renamed from ...
(vn_nary_build_or_lookup): ... this which now wraps it.
* gcc.dg/torture/pr71866.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr71866.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-pre.c
trunk/gcc/tree-ssa-sccvn.c
trunk/gcc/tree-ssa-sccvn.h
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