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* mn10300.h (RETURN_ADDR_RTX): Define.
* mn10300.c (count_tst_insns): New function.
(expand_prologue): Load zero into data and/or address registers
if any are free and the function has optimizable tst insns.
(output_tst): If a suitable register is known to have the
value zero, use it instead of searching for a suitable register.
* mn10300.h (zero_dreg, zero_areg): Declare.
(FRAME_POINTER_NEEDED): Frame pointers are not needed if the
outgoing argument size is zero.
* mn10300.md (movXX): Optimize loading zero i register if possible. Optimize loading a DF/DI mode value
into an address register from a constant memory address.
(addsi3): Provide alternative which doesn't require a matching
inout operand.
(return): Optimize consecutive return instructions.
From-SVN: r13845
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