* config/pdp11/pdp11-protos.h (pdp11_cannot_change_mode_class,
pdp11_secondary_memory_needed): Declare.
* config/pdp11/predicates.md (float_operand): New predicate.
* config/pdp11/pdp11.md (RETVAL_REGNUM): New constant.
(cbranchdf4, movdf): Change predicate.
(movsf): Handle FPU register case.
(truncdfsf2, extendsfdf2): Add FPU register case.
* config/pdp11/pdp11.c (TARGET_SECONDARY_RELOAD,
TARGET_REGISTER_MOVE_COST, TARGET_PREFERRED_RELOAD_CLASS,
TARGET_PREFERRED_OUTPUT_RELOAD_CLASS): Define.
(pdp11_register_move_cost): Update cost matrix.
(pdp11_cannot_change_mode_class, pdp11_preferred_reload_class,
pdp11_preferred_output_reload_class, pdp11_secondary_reload,
pdp11_secondary_memory_needed): New function.
(pdp11_return_in_memory): Add other float types.
* config/pdp11/pdp11.h (HARD_REGNO_MODE_OK): Add other float
types. 
(SECONDARY_MEMORY_NEEDED, CANNOT_CHANGE_MODE_CLASS): Define.
(PREFERRED_RELOAD_CLASS, SECONDARY_RELOAD_CLASS,
REGISTER_MOVE_COST): Delete.
(BASE_RETURN_VALUE_REG): Add other float types.

From-SVN: r166060