[Bug tree-optimization/61328] valgrind finds problem in find_bswap_or_nop_1

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61328

--- Comment #5 from thopre01 at gcc dot gnu.org ---
Author: thopre01
Date: Tue Jun  3 09:29:06 2014
New Revision: 211166

URL: http://gcc.gnu.org/viewcvs?rev=211166&root=gcc&view=rev
Log:
2014-06-03  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    PR tree-optimization/61328
    * tree-ssa-math-opts.c (init_symbolic_number): Extract symbolic number
        initialization from find_bswap_or_nop_1.
        (find_bswap_or_nop_1): Test return value of find_bswap_or_nop_1 stored
        in source_expr2 before using the size value the function sets. Also
        make use of init_symbolic_number () in both the old place and
        find_bswap_or_nop_load () to avoid reading uninitialized memory when
        doing recursion in the GIMPLE_BINARY_RHS case.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-math-opts.c