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[Bug middle-end/29548] Does not fold b * -2 + a * 6



------- Comment #2 from rguenth at gcc dot gnu dot org  2006-10-23 07:19 -------
Subject: Bug 29548

Author: rguenth
Date: Mon Oct 23 07:19:34 2006
New Revision: 117969

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=117969
Log:
2006-10-24  Richard Guenther  <rguenther@suse.de>

        PR middle-end/27132
        PR middle-end/23295
        * builtins.c (fold_binary): Remove checks for flag_wrapv
        and flag_trapv where negate_expr_p covers these cases.

        * gcc.dg/pr27132.c: New testcase.
        * gcc.dg/pr23295.c: Likewise.
        * gcc.dg/tree-ssa/pr23294.c: Adjust patterns.
        * g++.dg/tree-ssa/pr19807.C: Likewise.

2006-10-23  Richard Guenther  <rguenther@suse.de>

        PR middle-end/29548
        * fold-const.c (fold_plusminus_mult_expr): Check exact power
        of two on the absolute value.
        (fold_binary): Fold x * -C to -x * C if x is easily negatable
        and negating -C does not overflow.

Added:
    trunk/gcc/testsuite/gcc.dg/pr23295.c
    trunk/gcc/testsuite/gcc.dg/pr27132.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/tree-ssa/pr19807.C
    trunk/gcc/testsuite/gcc.dg/tree-ssa/pr23294.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29548


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