[Bug target/102125] (ARM Cortex-M3 and newer) missed optimization. memcpy not needed operations

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102125

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:d9792f8d227cdd409c2b082ef0685b47ccfaa334

commit r12-7786-gd9792f8d227cdd409c2b082ef0685b47ccfaa334
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Mar 23 14:53:49 2022 +0100

    target/102125 - alternative memcpy folding improvement

    The following extends the heuristical memcpy folding path with the
    ability to use misaligned accesses on strict-alignment targets just
    like the size-based path does.  That avoids regressing the following
    testcase on arm

        uint64_t bar64(const uint8_t *rData1)
        {
            uint64_t buffer;
            memcpy(&buffer, rData1, sizeof(buffer));
            return buffer;
        }

    when r12-3482-g5f6a6c91d7c592 is reverted.

    2022-03-23  Richard Biener  <rguenther@suse.de>

            PR target/102125
            * gimple-fold.cc (gimple_fold_builtin_memory_op): Allow the
            use of movmisalign when either the source or destination
            decl is properly aligned.