[Bug target/85328] [8 Regression] accessing ymm16 with non-avx512 instruction form

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85328

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Apr 12 11:17:23 2018
New Revision: 259344

URL: https://gcc.gnu.org/viewcvs?rev=259344&root=gcc&view=rev
Log:
        PR target/85328
        * config/i386/sse.md
        (<mask_codefor>avx512dq_vextract<shuffletype>64x2_1<mask_name> split,
        <mask_codefor>avx512f_vextract<shuffletype>32x4_1<mask_name> split,
        vec_extract_lo_<mode><mask_name> split, vec_extract_lo_v32hi,
        vec_extract_lo_v64qi): For non-AVX512VL if input is xmm16+ reg
        and output is a reg, avoid creating invalid lowpart subreg, but
        instead split into a 512-bit move.  Don't split if not AVX512VL,
        input is xmm16+ reg and output is a mem.
        (vec_extract_lo_<mode><mask_name>, vec_extract_lo_v32hi,
        vec_extract_lo_v64qi): Don't require split if not AVX512VL, input is
        xmm16+ reg and output is a mem.

        * gcc.target/i386/pr85328.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr85328.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/sse.md
    trunk/gcc/testsuite/ChangeLog