* config/m32c/m32c.md (UNS_FSETB, UNS_FREIT): New.
* config/m32c/prologue.md (epilogue_freit): New.
(fset_b): New.
* config/m32c/m32c.c (m32c_function_needs_enter): Add prototype.
(bank_switch_p): Likewise.
(fast_interrupt_p): Likewise.
(interrupt_p): Likewise.
(m32c_conditional_register_usage): Round memregs size up.
(need_to_save): We only need to save $a0 when we use ENTER.
(interrupt_p): Check for fast_interrupt too.
(bank_switch_p): New.
(fast_interrupt_p): New.
(m32c_attribute_table): Add bank_switch and fast_interrupt.
(m32c_emit_prolog): Support bank switching and fast interrupts.
* doc/extend.texi (Function Attributes): Add bank_switch and
fast_interrupt.

From-SVN: r150862