[Bug target/79038] Improve PowerPC ISA 3.0 conversion between integers and hardware _Float128

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79038

--- Comment #7 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Fri May  5 20:21:15 2017
New Revision: 247657

URL: https://gcc.gnu.org/viewcvs?rev=247657&root=gcc&view=rev
Log:
[gcc]
2017-05-05  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/79038
        PR target/79202
        PR target/79203
        * config/rs6000/rs6000.md (u code attribute): Add FIX and
        UNSIGNED_FIX.
        (extendsi<mode>2): Add support for doing sign extension via
        VUPKHSW and XXPERMDI if the value is in Altivec registers and we
        don't have ISA 3.0 instructions.
        (extendsi<mode>2 splitter): Likewise.
        (fix_trunc<mode>si2): If we are at ISA 2.07 (VSX small integer),
        generate the normal insns since SImode can now go in vector
        registers.  Disallow the special UNSPECs needed for previous
        machines to hide SImode being used.  Add new insns
        fctiw{,w}_<mode>_smallint if SImode can go in vector registers.
        (fix_trunc<mode>si2_stfiwx): Likewise.
        (fix_trunc<mode>si2_internal): Likewise.
        (fixuns_trunc<mode>si2): Likewise.
        (fixuns_trunc<mode>si2_stfiwx): Likewise.
        (fctiw<u>z_<mode>_smallint): Likewise.
        (fctiw<u>z_<mode>_mem): New combiner pattern to prevent conversion
        of floating point to 32-bit integer from doing a direct move to
        the GPR registers to do a store.
        (fctiwz_<mode>): Break long line.

[gcc/testsuite]
2017-05-05  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/79038
        PR target/79202
        PR target/79203
        * gcc.target/powerpc/ppc-round3.c: New test.
        * gcc.target/powerpc/ppc-round2.c: Update expected code.


Added:
    trunk/gcc/testsuite/gcc.target/powerpc/ppc-round3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.md
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/powerpc/ppc-round2.c