On Wed, May 20, 2015 at 01:35:41PM +0100, Jiong Wang wrote:
> Current IRA still use both target macros in a few places.
>
> Tell IRA to use the order we defined rather than with it's own cost
> calculation. Allocate caller saved first, then callee saved.
>
> This is especially useful for LR/x30, as it's free to allocate and is
> pure caller saved when used in leaf function.
>
> Haven't noticed significant impact on benchmarks, but by grepping some
> keywords like "Spilling", "Push.*spill" etc in ira rtl dump, the number
> is smaller.
>
> OK for trunk?
OK, sorry for the delay.
It might be mail client mangling, but please check that the trailing slashes
line up in the version that gets committed.
Thanks,
James
> 2015-05-19 Jiong. Wang <jiong.w...@arm.com>
>
> gcc/
> PR 63521
> * config/aarch64/aarch64.h (REG_ALLOC_ORDER): Define.
> (HONOR_REG_ALLOC_ORDER): Define.
>
> diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
> index bf59e40..0acdf10 100644
> --- a/gcc/config/aarch64/aarch64.h
> +++ b/gcc/config/aarch64/aarch64.h
> @@ -337,6 +337,31 @@ extern unsigned long aarch64_tune_flags;
> V_ALIASES(28), V_ALIASES(29), V_ALIASES(30), V_ALIASES(31) \
> }
>
> +#define REG_ALLOC_ORDER \
> +{ \
> + /* Reverse order for argument registers. */ \
> + 7, 6, 5, 4, 3, 2, 1, 0, \
> + /* Other caller-saved registers. */ \
> + 8, 9, 10, 11, 12, 13, 14, 15, \
> + 16, 17, 18, 30, \
> + /* Callee-saved registers. */ \
> + 19, 20, 21, 22, 23, 24, 25, 26, \
> + 27, 28, \
> + /* All other registers. */ \
> + 29, 31, \
> + /* Reverse order for argument vregisters. */ \
> + 39, 38, 37, 36, 35, 34, 33, 32, \
> + /* Other caller-saved vregisters. */ \
> + 48, 49, 50, 51, 52, 53, 54, 55, \
> + 56, 57, 58, 59, 60, 61, 62, 63, \
> + /* Callee-saved vregisters. */ \
> + 40, 41, 42, 43, 44, 45, 46, 47, \
> + /* Other pseudo registers. */ \
> + 64, 65, 66 \
> +}
> +
> +#define HONOR_REG_ALLOC_ORDER 1
> +
> /* Say that the epilogue uses the return address register. Note that
> in the case of sibcalls, the values "used by the epilogue" are
> considered live at the start of the called function. */
