[Bug tree-optimization/61306] [4.10 Regression] wrong code at -Os and above on x86_64-linux-gnu

[thopre01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61306

--- Comment #8 from thopre01 at gcc dot gnu.org ---
Author: thopre01
Date: Mon Jun 30 01:58:45 2014
New Revision: 212133

URL: https://gcc.gnu.org/viewcvs?rev=212133&root=gcc&view=rev
Log:
2014-06-30  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    Backport from mainline
    2014-06-20  Jakub Jelinek  <jakub@redhat.com>
    2014-06-11  Thomas Preud'homme  <thomas.preudhomme@arm.com>

    gcc/
    PR tree-optimization/61306
    * tree-ssa-math-opts.c (struct symbolic_number): Store type of
    expression instead of its size.
    (do_shift_rotate): Adapt to change in struct symbolic_number. Return
    false to prevent optimization when the result is unpredictable due to
    arithmetic right shift of signed type with highest byte is set.
    (verify_symbolic_number_p): Adapt to change in struct symbolic_number.
    (find_bswap_1): Likewise. Return NULL to prevent optimization when the
    result is unpredictable due to sign extension.
    (find_bswap): Adapt to change in struct symbolic_number.

    gcc/testsuite/
    * gcc.c-torture/execute/pr61306-1.c: New test.
    * gcc.c-torture/execute/pr61306-2.c: Likewise.
    * gcc.c-torture/execute/pr61306-3.c: Likewise.

Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.c-torture/execute/pr61306-1.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.c-torture/execute/pr61306-2.c
    branches/gcc-4_9-branch/gcc/testsuite/gcc.c-torture/execute/pr61306-3.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_9-branch/gcc/tree-ssa-math-opts.c