On 03/12/2018 10:39 AM, Marc Glisse wrote:
On Mon, 12 Mar 2018, Martin Liška wrote:

This is fix for the PR that introduces a new target macro. Using the macro
one can say that a target has a fast mempcpy and thus it's preferred to be used
if possible.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.
I also tested on x86_64-linux-gnu.

Ready to be installed?


2018-03-08  Martin Liska  <mli...@suse.cz>

    PR middle-end/81657
    * builtins.c (expand_builtin_memory_copy_args): Add new
    * config/i386/i386.h (TARGET_HAS_FAST_MEMPCPY_ROUTINE):
    New macro.

Shouldn't the macro be defined in a more specific case, for instance glibc on 
x86? Or do all known libc on x86 happen to provide a fast mempcpy?

That's Marc a very good question. Do we already have a glibc-related target 
If so, I would add this as one of these.


    * defaults.h (TARGET_HAS_FAST_MEMPCPY_ROUTINE): Likewise.
    * doc/tm.texi: Likewise.
    * doc/tm.texi.in: Likewise.
    * expr.c (compare_by_pieces): Add support for bail out.
    (emit_block_move_hints): Likewise.
    * expr.h (emit_block_move_hints): Add new arguments.

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