[Bug c/39855] [4.3/4.4/4.5 Regression] Shift optimization discards operands' side effects

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2009-04-22 21:58 -------
Subject: Bug 39855

Author: jakub
Date: Wed Apr 22 21:57:52 2009
New Revision: 146617

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=146617
Log:
        PR c/39855
        * fold-const.c (fold_binary) <case LSHIFT_EXPR>: When optimizing
        into 0, use omit_one_operand.

        * gcc.dg/torture/pr39855.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr39855.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/fold-const.c
    trunk/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39855