[Bug target/81550] [8 regression] gcc.target/powerpc/loop_align.c fails starting with r250482

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81550

--- Comment #11 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Mon Jan 29 22:30:34 2018
New Revision: 257166

URL: https://gcc.gnu.org/viewcvs?rev=257166&root=gcc&view=rev
Log:
2018-01-29  Michael Meissner  <meiss...@linux.vnet.ibm.com>

        PR target/81550
        * config/rs6000/rs6000.c (rs6000_setup_reg_addr_masks): If DFmode
        and SFmode can go in Altivec registers (-mcpu=power7 for DFmode,
        -mcpu=power8 for SFmode) don't set the PRE_INCDEC or PRE_MODIFY
        flags.  This restores the settings used before the 2017-07-24.
        Turning off pre increment/decrement/modify allows IVOPTS to
        optimize DF/SF loops where the index is an int.


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