[Bug target/78900] ICE in gcc.target/powerpc/signbit-3.c

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78900

--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Tue Jan 10 20:03:00 2017
New Revision: 244285

URL: https://gcc.gnu.org/viewcvs?rev=244285&root=gcc&view=rev
Log:
2017-01-10  Michael Meissner  <meissner@linux.vnet.ibm.com>

        Backport from mainline
        2016-12-30  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/78900
        * config/rs6000/rs6000.c (rs6000_split_signbit): Change some
        assertions.  Add support for doing the signbit if the IEEE 128-bit
        floating point value is in a GPR.
        * config/rs6000/rs6000.md (Fsignbit): Delete.
        (signbit<mode>2_dm): Delete using <Fsignbit> and just use "wa".
        Update the length attribute if the value is in a GPR.
        (signbit<mode>2_dm_<su>ext): Add combiner pattern to eliminate
        the sign or zero extension instruction, since the value is always
        0/1.
        (signbit<mode>2_dm2): Delete using <Fsignbit>.


Modified:
    branches/gcc-6-branch/gcc/ChangeLog
    branches/gcc-6-branch/gcc/config/rs6000/rs6000.c
    branches/gcc-6-branch/gcc/config/rs6000/rs6000.md