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Diffstat (limited to 'x86/Conventions1.v')
| -rw-r--r-- | x86/Conventions1.v | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/x86/Conventions1.v b/x86/Conventions1.v index a4e3b970..abd22001 100644 --- a/x86/Conventions1.v +++ b/x86/Conventions1.v @@ -82,6 +82,23 @@ Definition dummy_float_reg := X0. (**r Used in [Regalloc]. *) Definition callee_save_type := mreg_type. +(** 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 |