On 9/25/21 19:30, WANG Xuerui wrote:
> Signed-off-by: WANG Xuerui <g...@xen0n.name>
> Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
> ---
> tcg/loongarch64/tcg-target.c.inc | 137 +++++++++++++++++++++++++++++++
> 1 file changed, 137 insertions(+)
> +static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
> +{
> + if (ret == arg) {
> + return true;
> + }
> + switch (type) {
> + case TCG_TYPE_I32:
> + case TCG_TYPE_I64:
> + /*
> + * Conventional register-register move used in LoongArch is
> + * `or dst, src, zero`.
> + */
> + tcg_out_opc_or(s, ret, arg, TCG_REG_ZERO);
> + break;
> + default:
> + g_assert_not_reached();
> + }
> + return true;
> +}
> +static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
> + tcg_target_long val)
> +{
> + /*
> + * LoongArch conventionally loads 64-bit immediates in at most 4 steps,
> + * with dedicated instructions for filling the respective bitfields
> + * below:
> + *
> + * 6 5 4 3
> + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
> + * +-----------------------+---------------------------------------+...
> + * | hi52 | hi32 |
> + * +-----------------------+---------------------------------------+...
> + * 3 2 1
> + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
> + * ...+-------------------------------------+-------------------------+
> + * | hi12 | lo |
> + * ...+-------------------------------------+-------------------------+
> + *
> + * Check if val belong to one of the several fast cases, before falling
> + * back to the slow path.
> + */
Lovely :)
Reviewed-by: Philippe Mathieu-Daudé <f4...@amsat.org>
