[Bug tree-optimization/88828] Inefficient update of the first element of vector registers

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88828

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon May  6 12:43:30 2019
New Revision: 270908

URL: https://gcc.gnu.org/viewcvs?rev=270908&root=gcc&view=rev
Log:
2019-05-06  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/88828
        * tree-ssa-forwprop.c (get_bit_field_ref_def): Split out from...
        (simplify_vector_constructor): ...here.  Handle constants in
        the constructor.

        * gcc.target/i386/pr88828-0.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr88828-0.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-forwprop.c