[Bug c++/49039] [4.6/4.7 Regression] LLVM StringRef miscompilation with -O2

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49039

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-05-18 
20:43:48 UTC ---
Author: jakub
Date: Wed May 18 20:43:44 2011
New Revision: 173877

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=173877
Log:
    PR tree-optimization/49039
    * tree-vrp.c (extract_range_from_binary_expr): For
    MIN_EXPR <~[a, b], ~[c, d]> and MAX_EXPR <~[a, b], ~[c, d]>
    return ~[MAX_EXPR <a, c>, MIN_EXPR <b, d>].

    * gcc.c-torture/execute/pr49039.c: New test.
    * gcc.dg/tree-ssa/pr49039.c: New test.
    * g++.dg/torture/pr49039.C: New test.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/torture/pr49039.C
    branches/gcc-4_6-branch/gcc/testsuite/gcc.c-torture/execute/pr49039.c
    branches/gcc-4_6-branch/gcc/testsuite/gcc.dg/tree-ssa/pr49039.c
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
    branches/gcc-4_6-branch/gcc/tree-vrp.c