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dafcb54e42
* 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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