On 12/06/2013 10:51 AM, Peter Maydell wrote:
> From: Alexander Graf <agraf@xxxxxxx>
>
> This patch adds emulation support for the EXTR instruction.
>
> Signed-off-by: Alexander Graf <agraf@xxxxxxx>
>
> [claudio: adapted for new decoder, removed a few temporaries,
> fixed the 32bit bug, added checks for more
> unallocated cases]
>
> Signed-off-by: Claudio Fontana <claudio.fontana@xxxxxxxxxx>
> Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
> ---
> target-arm/translate-a64.c | 48 ++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 46 insertions(+), 2 deletions(-)
Reviewed-by: Richard Henderson <rth@xxxxxxxxxxx>
> + tcg_rm = read_cpu_reg(s, rm, sf);
> + tcg_rn = read_cpu_reg(s, rn, sf);
> + tcg_gen_shri_i64(tcg_rm, tcg_rm, imm);
> + tcg_gen_shli_i64(tcg_rn, tcg_rn, bitsize - imm);
> + tcg_gen_or_i64(tcg_rd, tcg_rm, tcg_rn);
> + if (!sf) {
> + tcg_gen_ext32u_i64(tcg_rd, tcg_rd);
> + }
OPTME: If Rm==Rn, this is a rotate.
r~
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