[Patch] 2/2 MIPS atomic memory operations.

[David Daney]

This patch adds atomic memory operation for MIPS.  It depends on part 1 
of the patch which is a change to the generic expanders.

In:
http://gcc.gnu.org/ml/gcc-patches/2007-08/msg01128.html

Richard essentially pre-approved this, but I wanted to post it again 
because of how it interacts with the changes I want to make to 
expand_sync_operation() and expand_sync_fetch_operation().

Tested on mips64-linux.

OK to commit if the first part is approved?

gcc/

2007-08-20  David Daney  <ddaney@avtrex.com>

    * config/mips/mips.md (UNSPEC_COMPARE_AND_SWAP, UNSPEC_SYNC_OLD_OP,
    UNSPEC_SYNC_NEW_OP, UNSPEC_SYNC_EXCHANGE): New define_constants.
    (optab, insn): Add more attributes.
    (fetchop_bit): New code macro.
    (immediate_insn): New code macro attribute.
    (sync): Change condition to ISA_HAS_SYNC.
    (rdhwr): Change predicate for operand 0 to register_operand.
    (memory_barrier): New expand.
    (sync_compare_and_swap<mode>, sync_add<mode>, sync_sub<mode>,
    sync_old_add<mode>, sync_old_sub<mode>, sync_new_add<mode>,
    sync_new_sub<mode>, sync_<optab><mode>,    sync_old_<optab><mode>,
    sync_new_<optab><mode>, sync_nand<mode>, sync_old_nand<mode>,
    sync_new_nand<mode>, sync_lock_test_and_set<mode>): New insns.
    * config/mips/mips.h (ISA_HAS_SYNC, ISA_HAS_LL_SC): New ISA predicates.
    (MIPS_COMPARE_AND_SWAP, MIPS_SYNC_OP, MIPS_SYNC_OLD_OP,
    MIPS_SYNC_NEW_OP, MIPS_SYNC_NAND, MIPS_SYNC_OLD_NAND,
    MIPS_SYNC_NEW_NAND, MIPS_SYNC_EXCHANGE): New Macros.
   

gcc/testsuite/
2007-08-20  David Daney  <ddaney@avtrex.com>
    * gcc.target/mips/gcc-have-sync-compare-and-swap-1.c: New test.
    * gcc.target/mips/gcc-have-sync-compare-and-swap-2.c: Ditto.
    * gcc.target/mips/atomic-memory-1.c: Ditto.
    * testsuite/gcc.target/mips/atomic-memory-2.c: Ditto.

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