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Diffstat (limited to 'powerpc/Conventions1.v')
| -rw-r--r-- | powerpc/Conventions1.v | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/powerpc/Conventions1.v b/powerpc/Conventions1.v index f05e77df..2b93e1d8 100644 --- a/powerpc/Conventions1.v +++ b/powerpc/Conventions1.v @@ -91,6 +91,23 @@ Definition float_callee_save_regs := Definition dummy_int_reg := R3. (**r Used in [Coloring]. *) Definition dummy_float_reg := F0. (**r Used in [Coloring]. *) +(** How to use registers for register allocation. + We favor the use of caller-save registers, using callee-save registers + only when no caller-save is available. *) + +Record alloc_regs := mk_alloc_regs { + preferred_int_regs: list mreg; + remaining_int_regs: list mreg; + preferred_float_regs: list mreg; + remaining_float_regs: list mreg +}. + +Definition allocatable_registers (_: unit) := + {| preferred_int_regs := int_caller_save_regs; + remaining_int_regs := int_callee_save_regs; + preferred_float_regs := float_caller_save_regs; + remaining_float_regs := float_callee_save_regs |}. + (** * Function calling conventions *) (** The functions in this section determine the locations (machine registers |