[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 #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Tue May 14 09:11:15 2019
New Revision: 271153

URL: https://gcc.gnu.org/viewcvs?rev=271153&root=gcc&view=rev
Log:
2019-05-14  Richard Biener  <rguent...@suse.de>
        H.J. Lu  <hongjiu...@intel.com>

        PR tree-optimization/88828
        * tree-ssa-forwprop.c (simplify_vector_constructor): Handle
        permuting in a single non-constant element not extracted
        from a vector.

        * gcc.target/i386/pr88828-1.c: New test.
        * gcc.target/i386/pr88828-1a.c: Likewise.
        * gcc.target/i386/pr88828-1b.c: Likewise.
        * gcc.target/i386/pr88828-1c.c: Likewise.
        * gcc.target/i386/pr88828-4a.c: Likewise.
        * gcc.target/i386/pr88828-4b.c: Likewise.
        * gcc.target/i386/pr88828-5a.c: Likewise.
        * gcc.target/i386/pr88828-5b.c: Likewise.
        * gcc.target/i386/pr88828-7.c: Likewise.
        * gcc.target/i386/pr88828-7a.c: Likewise.
        * gcc.target/i386/pr88828-7b.c: Likewise.
        * gcc.target/i386/pr88828-8.c: Likewise.
        * gcc.target/i386/pr88828-8a.c: Likewise.
        * gcc.target/i386/pr88828-8b.c: Likewise.
        * gcc.target/i386/pr88828-9.c: Likewise.
        * gcc.target/i386/pr88828-9a.c: Likewise.
        * gcc.target/i386/pr88828-9b.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr88828-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-1a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-1b.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-1c.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-4a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-4b.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-5a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-5b.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-7.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-7a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-7b.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-8.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-8a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-8b.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-9.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-9a.c
    trunk/gcc/testsuite/gcc.target/i386/pr88828-9b.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-forwprop.c