[Bug target/85323] SSE/AVX/AVX512 shift by 0 not optimized away

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85323

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu May 17 09:54:36 2018
New Revision: 260311

URL: https://gcc.gnu.org/viewcvs?rev=260311&root=gcc&view=rev
Log:
        PR target/85323
        * config/i386/i386.c: Include tree-vector-builder.h.
        (ix86_vector_shift_count): New function.
        (ix86_fold_builtin): Fold shift builtins by scalar count.
        (ix86_gimple_fold_builtin): Likewise.

        * gcc.target/i386/pr85323-1.c: New test.
        * gcc.target/i386/pr85323-2.c: New test.
        * gcc.target/i386/pr85323-3.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr85323-1.c
    trunk/gcc/testsuite/gcc.target/i386/pr85323-2.c
    trunk/gcc/testsuite/gcc.target/i386/pr85323-3.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog