On Tue, Jun 11, 2019 at 8:14 AM H.J. Lu <hjl.to...@gmail.com> wrote: > > For op_by_pieces operations between two areas of memory, this patch adds > -fminimize-op-by-pieces-run to minimize number of operations. When > operating on LENGTH bytes of memory, it starts with the widest usable > integer size, MAX_SIZE, for LENGTH bytes and finishes with the smallest > usable integer size, MIN_SIZE, for the remaining bytes where MAX_SIZE > >= MIN_SIZE. If MIN_SIZE > the remaining bytes, the last operation is > performed on MIN_SIZE bytes of overlapping memory from the previous > operation. > > Tested on Linux/x86-64 with both -fminimize-op-by-pieces-run enabled > and disabled by default. > > I will submit a separate patch to enable -fminimize-op-by-pieces-run for -Os. > > OK for trunk? > > gcc/ > > PR middl-end/90773 > * common.opt (-fminimize-op-by-pieces-run): New. > * expr.c (op_by_pieces_d): Add get_usable_mode. > (op_by_pieces_d::get_usable_mode): New. > (op_by_pieces_d::run): Use get_usable_mode to get the largest > usable integer mode for -fminimize-op-by-pieces-run. > * doc/invoke.texi: Document -fminimize-op-by-pieces-run. > > gcc/testsuite/ > > PR middl-end/90773 > * gcc.target/i386/pr90773-1.c: New test. > * gcc.target/i386/pr90773-2.c: Likewise. > * gcc.target/i386/pr90773-3.c: Likewise. > * gcc.target/i386/pr90773-4.c: Likewise. > * gcc.target/i386/pr90773-5.c: Likewise. > > Thanks. >
PING: https://gcc.gnu.org/ml/gcc-patches/2019-06/msg00641.html -- H.J.
