Commit 638808ff authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

target/arm: Decode aa32 armv8.3 2-reg-index 



Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Message-id: 20180228193125.20577-15-richard.henderson@linaro.org
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent 8b7209fa

target/arm/translate.c

+61 −0
Original line number Diff line number Diff line
@@ -7742,6 +7742,61 @@ static int disas_neon_insn_3same_ext(DisasContext *s, uint32_t insn) 
    return 0;

}



/* Advanced SIMD two registers and a scalar extension.

 *  31             24   23  22   20   16   12  11   10   9    8        3     0

 * +-----------------+----+---+----+----+----+---+----+---+----+---------+----+

 * | 1 1 1 1 1 1 1 0 | o1 | D | o2 | Vn | Vd | 1 | o3 | 0 | o4 | N Q M U | Vm |

 * +-----------------+----+---+----+----+----+---+----+---+----+---------+----+

 *

 */



static int disas_neon_insn_2reg_scalar_ext(DisasContext *s, uint32_t insn)

{

    int rd, rn, rm, rot, size, opr_sz;

    TCGv_ptr fpst;

    bool q;



    q = extract32(insn, 6, 1);

    VFP_DREG_D(rd, insn);

    VFP_DREG_N(rn, insn);

    VFP_DREG_M(rm, insn);

    if ((rd | rn) & q) {

        return 1;

    }



    if ((insn & 0xff000f10) == 0xfe000800) {

        /* VCMLA (indexed) -- 1111 1110 S.RR .... .... 1000 ...0 .... */

        rot = extract32(insn, 20, 2);

        size = extract32(insn, 23, 1);

        if (!arm_dc_feature(s, ARM_FEATURE_V8_FCMA)

            || (!size && !arm_dc_feature(s, ARM_FEATURE_V8_FP16))) {

            return 1;

        }

    } else {

        return 1;

    }



    if (s->fp_excp_el) {

        gen_exception_insn(s, 4, EXCP_UDEF,

                           syn_fp_access_trap(1, 0xe, false), s->fp_excp_el);

        return 0;

    }

    if (!s->vfp_enabled) {

        return 1;

    }



    opr_sz = (1 + q) * 8;

    fpst = get_fpstatus_ptr(1);

    tcg_gen_gvec_3_ptr(vfp_reg_offset(1, rd),

                       vfp_reg_offset(1, rn),

                       vfp_reg_offset(1, rm), fpst,

                       opr_sz, opr_sz, rot,

                       size ? gen_helper_gvec_fcmlas_idx

                       : gen_helper_gvec_fcmlah_idx);

    tcg_temp_free_ptr(fpst);

    return 0;

}



static int disas_coproc_insn(DisasContext *s, uint32_t insn)

{

    int cpnum, is64, crn, crm, opc1, opc2, isread, rt, rt2;
@@ -8492,6 +8547,12 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn) 
                goto illegal_op;

            }

            return;

        } else if ((insn & 0x0f000a00) == 0x0e000800

                   && arm_dc_feature(s, ARM_FEATURE_V8)) {

            if (disas_neon_insn_2reg_scalar_ext(s, insn)) {

                goto illegal_op;

            }

            return;

        } else if ((insn & 0x0fe00000) == 0x0c400000) {

            /* Coprocessor double register transfer.  */

            ARCH(5TE);