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 <li...@gcc.gnu.org>: https://gcc.gnu.org/g:8408120fecc56385b316dafec1bdfe3aac61fc05 commit r13-3716-g8408120fecc56385b316dafec1bdfe3aac61fc05 Author: Kewen Lin <li...@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.
