[Bug middle-end/43419] gcc replaces pow(x, 0.5) by sqrt(x), invalid when x is -0
vincent at vinc17 dot org
gcc-bugzilla@gcc.gnu.org
Thu Mar 18 14:33:00 GMT 2010
------- Comment #1 from vincent at vinc17 dot org 2010-03-18 14:33 -------
If I understand correctly, the bug appears with:
r119248 | rguenth | 2006-11-27 12:38:42 +0100 (Mon, 27 Nov 2006) | 10 lines
2006-11-27 Richard Guenther <rguenther@suse.de>
PR middle-end/25620
* builtins.c (expand_builtin_pow): Optimize non integer valued
constant exponents using sqrt or cbrt if possible. Always fall back
to expanding via optabs.
* gcc.target/i386/pow-1.c: New testcase.
* gcc.dg/builtins-58.c: Likewise.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43419
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