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Registers are allocated in order.
REG_ALLOC_ORDER
-
If defined, an initializer for a vector of integers, containing the
numbers of hard registers in the order in which GNU CC should prefer
to use them (from most preferred to least).
If this macro is not defined, registers are used lowest numbered first
(all else being equal).
One use of this macro is on machines where the highest numbered
registers must always be saved and the save-multiple-registers
instruction supports only sequences of consecutive registers. On such
machines, define
REG_ALLOC_ORDER to be an initializer that lists
the highest numbered allocatable register first.
ORDER_REGS_FOR_LOCAL_ALLOC
-
A C statement (sans semicolon) to choose the order in which to allocate
hard registers for pseudo-registers local to a basic block.
Store the desired register order in the array
reg_alloc_order.
Element 0 should be the register to allocate first; element 1, the next
register; and so on.
The macro body should not assume anything about the contents of
reg_alloc_order before execution of the macro.
On most machines, it is not necessary to define this macro.
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