[Bug c++/41094] Erroneous optimization of pow() with -ffast-math

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-08-18 13:40 -------
Subject: Bug 41094

Author: rguenth
Date: Tue Aug 18 13:40:18 2009
New Revision: 150874

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=150874
Log:
2009-08-18  Richard Guenther  <rguent...@suse.de>

        PR middle-end/41094
        * builtins.c (fold_builtin_pow): Fold pow(pow(x,y),z) to
        pow(x,y*z) only if x is nonnegative.

        * gcc.dg/torture/pr41094.c: New testcase.
        * gcc.dg/torture/builtin-power-1.c: Adjust.
        * gcc.dg/builtins-10.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr41094.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/builtins-10.c
    trunk/gcc/testsuite/gcc.dg/torture/builtin-power-1.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41094