[Bug middle-end/90263] Calls to mempcpy should use memcpy

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90263

--- Comment #21 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Mon May 20 07:55:00 2019
New Revision: 271400

URL: https://gcc.gnu.org/viewcvs?rev=271400&root=gcc&view=rev
Log:
Come up with hook libc_has_fast_function (PR middle-end/90263).

2019-05-20  Martin Liska  <mli...@suse.cz>

        PR middle-end/90263
        * builtins.c (expand_builtin_memory_copy_args): When having a
        target with fast mempcpy implementation do now use memcpy.
        * config/i386/i386.c (ix86_libc_has_fast_function): New.
        (TARGET_LIBC_HAS_FAST_FUNCTION): Likewise.
        * doc/tm.texi: Likewise.
        * doc/tm.texi.in: Likewise.
        * target.def:
        * expr.c (emit_block_move_hints): Add 2 new arguments.
        * expr.h (emit_block_move_hints): Bail out when libcall
        to memcpy would be used.
2019-05-20  Martin Liska  <mli...@suse.cz>

        PR middle-end/90263
        * gcc.c-torture/compile/pr90263.c: New test.
        * lib/target-supports.exp: Add check_effective_target_glibc.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr90263.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/builtins.c
    trunk/gcc/config/i386/i386.c
    trunk/gcc/doc/tm.texi
    trunk/gcc/doc/tm.texi.in
    trunk/gcc/expr.c
    trunk/gcc/expr.h
    trunk/gcc/target.def
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/lib/target-supports.exp