[Bug target/78904] zero-extracts are not effective

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78904

--- Comment #13 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Dec 28 15:16:26 2016
New Revision: 243955

URL: https://gcc.gnu.org/viewcvs?rev=243955&root=gcc&view=rev
Log:
        PR target/78904
        * config/i386/constraints.md (Bn): New special memory constraint.
        * config/i386/predicates.md (norex_memory_operand): New predicate.
        * config/i386/i386.md (*extzvqi_mem_rex64): New insn pattern and
        corresponding peephole2 pattern.

testsuite/ChangeLog:

        PR target/78904
        * gcc.target/i386/pr78904-4.c: New test.
        * gcc.target/i386/pr78904-5.c: Ditto.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr78904-4.c
    trunk/gcc/testsuite/gcc.target/i386/pr78904-5.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/constraints.md
    trunk/gcc/config/i386/i386.md
    trunk/gcc/config/i386/predicates.md
    trunk/gcc/testsuite/ChangeLog