[Bug target/68609] PowerPC reciprocal estimate missed opportunities

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68609

--- Comment #4 from David Edelsohn <dje at gcc dot gnu.org> ---
Author: dje
Date: Fri Jan 15 16:38:08 2016
New Revision: 232439

URL: https://gcc.gnu.org/viewcvs?rev=232439&root=gcc&view=rev
Log:
        PR target/68609
        * config/rs6000/rs6000.c (rs6000_emit_msub): Delete.
        (rs6000_emit_swsqrt): Convert to Goldschmidt's Algorithm
        * config/rs6000/rs6000.md (sqrt<mode>2): Limit swsqrt to high
        precision estimate.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/config/rs6000/rs6000.md