2016-04-28  Joern Rennecke  <joern.rennecke@embecosm.com>
            Andrew Burgess  <andrew.burgess@embecosm.com>
gcc:
        * config/arc/arc.h (SYMBOL_FLAG_CMEM): Define.
        (TARGET_NPS_CMEM_DEFAULT): Provide default definition.
        * config/arc/arc.c (arc_address_cost): Return 0 for cmem_address.
        (arc_encode_section_info): Set SYMBOL_FLAG_CMEM where indicated.
        * config/arc/arc.opt (mcmem): New option.
        * config/arc/arc.md (*extendqihi2_i): Add r/Uex alternative,
        supply length for r/m alternative.
        (*extendqisi2_ac): Likewise.
        (*extendhisi2_i): Add r/Uex alternative, supply length for r/m and
        r/Uex alternative.
        (movqi_insn): Add r/Ucm and Ucm/?Rac alternatives.
        (movhi_insn): Likewise.
        (movsi_insn): Add r/Ucm,Ucm/w alternatives.
        (*zero_extendqihi2_i): Add r/Ucm alternative.
        (*zero_extendqisi2_ac): Likewise.
        (*zero_extendhisi2_i): Likewise.
        * config/arc/constraints.md (Uex): New memory constraint.
        (Ucm): New define_constraint.
        * config/arc/predicates.md (long_immediate_loadstore_operand):
        Return 0 for MEM with cmem_address address.
        (cmem_address_0): New predicates.
        (cmem_address_1): Likewise.
        (cmem_address_2): Likewise.
        (cmem_address): Likewise.
gcc/testsuite:
        * gcc.target/arc/cmem-1.c: New file.
        * gcc.target/arc/cmem-2.c: New file.
        * gcc.target/arc/cmem-3.c: New file.
        * gcc.target/arc/cmem-4.c: New file.
        * gcc.target/arc/cmem-5.c: New file.
        * gcc.target/arc/cmem-6.c: New file.
        * gcc.target/arc/cmem-7.c: New file.
        * gcc.target/arc/cmem-ld.inc: New file.
        * gcc.target/arc/cmem-st.inc: New file.

Co-Authored-By: Andrew Burgess <andrew.burgess@embecosm.com>

From-SVN: r235595