[Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0

[jakub at gcc dot gnu dot org]

------- Comment #8 from jakub at gcc dot gnu dot org  2010-03-22 14:58 -------
Subject: Bug 43419

Author: jakub
Date: Mon Mar 22 14:58:00 2010
New Revision: 157631

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=157631
Log:
        Backport from mainline:
        2010-03-18  Michael Matz  <matz@suse.de>

        PR middle-end/43419
        * builtins.c (expand_builtin_pow): Don't transform pow(x, 0.5)
        into sqrt(x) if we need to preserve signed zeros.

        * gcc.dg/pr43419.c: New testcase.

Added:
    branches/gcc-4_4-branch/gcc/testsuite/gcc.dg/pr43419.c
Modified:
    branches/gcc-4_4-branch/gcc/ChangeLog
    branches/gcc-4_4-branch/gcc/builtins.c
    branches/gcc-4_4-branch/gcc/testsuite/ChangeLog


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419