rs6000.c (word_offset_memref_operand): New predicate to handle 'ld' conform addresses.

rs6000.c (word_offset_memref_operand): New predicate to handle 'ld' conform addresses.

      * gcc/config/rs6000/rs6000.c (word_offset_memref_operand): New
       predicate to handle 'ld' conform addresses.
       * gcc/config/rs6000/rs6000.h (EXTRA_CONSTRAINT): New 'Y'
       contraint.
       (EXTRA_MEMORY_CONSTRAINT): Tell reload which constraint
       are memory contraints.
       * gcc/config/rs6000/rs6000-protos.h (word_offset_memref_operand):
       New prototype.
       * gcc/config/rs6000/rs6000.md (*movdf_hardfloat64):
       Change 'o' to 'Y' constraint.
       (*movdf_softfloat64): Ditto.

From-SVN: r75707