rx.c (rx_conditional_register_usage): Do not warn if no fixed registers are…
rx.c (rx_conditional_register_usage): Do not warn if no fixed registers are available for interrupt handlers. * config/rx/rx.c (rx_conditional_register_usage): Do not warn if no fixed registers are available for interrupt handlers. Do not fix normal registers. (MUST_SAVE_ACC_REGISTER): New macro. (rx_get_stack_layout): Create a stack frame for fast interrupt handlers, if necessary. Push extra registers if needed in order to save the accumulator. (rx_expand_prologue): Create a stack frame for fast interrupt handlers, if necessary. (rx_expand_builtin_mvfc): Handle the case where there is no target. From-SVN: r154903
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