[Bug tree-optimization/107412] Miss to fold LEN_{LOAD,STORE} when the specified length equal to vector length

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107412

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:8408120fecc56385b316dafec1bdfe3aac61fc05

commit r13-3716-g8408120fecc56385b316dafec1bdfe3aac61fc05
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Mon Nov 7 02:07:27 2022 -0600

    vect: Fold LEN_{LOAD,STORE} if it's for the whole vector [PR107412]

    As the test case in PR107412 shows, we can fold IFN .LEN_{LOAD,
    STORE} into normal vector load/store if the given length is known
    to be equal to the length of the whole vector.  It would help to
    improve overall cycles as normally the latency of vector access
    with length in bytes is bigger than normal vector access, and it
    also saves the preparation for length if constant length can not
    be encoded into instruction (such as on power).

            PR tree-optimization/107412

    gcc/ChangeLog:

            * gimple-fold.cc (gimple_fold_mask_load_store_mem_ref): Rename to
...
            (gimple_fold_partial_load_store_mem_ref): ... this, add one
parameter
            mask_p indicating it's for mask or length, and add some handlings
for
            IFN LEN_{LOAD,STORE}.
            (gimple_fold_mask_load): Rename to ...
            (gimple_fold_partial_load): ... this, add one parameter mask_p.
            (gimple_fold_mask_store): Rename to ...
            (gimple_fold_partial_store): ... this, add one parameter mask_p.
            (gimple_fold_call): Add the handlings for IFN LEN_{LOAD,STORE},
            and adjust calls on gimple_fold_mask_load_store_mem_ref to
            gimple_fold_partial_load_store_mem_ref.

    gcc/testsuite/ChangeLog:

            * gcc.target/powerpc/pr107412.c: New test.
            * gcc.target/powerpc/p9-vec-length-epil-8.c: Adjust scan times for
            folded LEN_LOAD.