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Subject: [Bug c++/65851] ice in set_lattice_value at tree-ssa-cc p.c:535
Date: Tue, 28 Apr 2015 07:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65851

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue Apr 28 07:26:41 2015
New Revision: 222510

URL: https://gcc.gnu.org/viewcvs?rev=222510&root=gcc&view=rev
Log:
2015-04-28  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/65851
        * tree-ssa-ccp.c (set_lattice_value): Perform a meet when
        changing CONSTANT to CONSTANT non-copy.  Get new_val by reference.
        (ccp_lattice_meet): Remove stray argument.  Use operand_equal_p
        rather than simple_cst_equal as the latter doesn't handle COMPLEX_CST.
        (ccp_visit_phi_node): Adjust.
        (evaluate_stmt): For simplifications to SSA names return its
        lattice value if that isn't VARYING.  Return immediately when
        simplified to a constant.
        (visit_assignment): Adjust.
        (ccp_visit_stmt): Likewise.

        * g++.dg/torture/pr65851.C: New testcase.

Added:
    trunk/gcc/testsuite/g++.dg/torture/pr65851.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-ccp.c