Commit 8317ea06 authored by Andreas Konopik's avatar Andreas Konopik Committed by Bastian Koppelmann
Browse files

tricore: add QSEED instruction 



Signed-off-by: default avatarAndreas Konopik <andreas.konopik@efs-auto.de>
Signed-off-by: default avatarDavid Brenken <david.brenken@efs-auto.de>
Signed-off-by: default avatarGeorg Hofstetter <georg.hofstetter@efs-auto.de>
Signed-off-by: default avatarRobert Rasche <robert.rasche@efs-auto.de>
Signed-off-by: default avatarLars Biermanski <lars.biermanski@efs-auto.de>
Reviewed-by: default avatarBastian Koppelmann <kbastian@mail.uni-paderborn.de>
Message-Id: <20190624070339.4408-6-david.brenken@efs-auto.org>
Signed-off-by: default avatarBastian Koppelmann <kbastian@mail.uni-paderborn.de>
[BK: Added fp_status arg to float32_is_signaling_nan()]
parent ef1b1de5

target/tricore/fpu_helper.c

+85 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 


#define QUIET_NAN 0x7fc00000

#define ADD_NAN   0x7fc00001

#define SQRT_NAN  0x7fc00004

#define DIV_NAN   0x7fc00008

#define MUL_NAN   0x7fc00002

#define FPU_FS PSW_USB_C
@@ -32,6 +33,9 @@ 
#define FPU_FZ PSW_USB_AV

#define FPU_FU PSW_USB_SAV



#define float32_sqrt_nan make_float32(SQRT_NAN)

#define float32_quiet_nan make_float32(QUIET_NAN)



/* we don't care about input_denormal */

static inline uint8_t f_get_excp_flags(CPUTriCoreState *env)

{
@@ -166,6 +170,87 @@ uint32_t helper_fmul(CPUTriCoreState *env, uint32_t r1, uint32_t r2) 


}



/*

 * Target TriCore QSEED.F significand Lookup Table

 *

 * The QSEED.F output significand depends on the least-significant

 * exponent bit and the 6 most-significant significand bits.

 *

 * IEEE 754 float datatype

 * partitioned into Sign (S), Exponent (E) and Significand (M):

 *

 * S   E E E E E E E E   M M M M M M ...

 *    |             |               |

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

 *           |              |

 *          for        lookup table

 *      calculating     index for

 *        output E       output M

 *

 * This lookup table was extracted by analyzing QSEED output

 * from the real hardware

 */

static const uint8_t target_qseed_significand_table[128] = {

    253, 252, 245, 244, 239, 238, 231, 230, 225, 224, 217, 216,

    211, 210, 205, 204, 201, 200, 195, 194, 189, 188, 185, 184,

    179, 178, 175, 174, 169, 168, 165, 164, 161, 160, 157, 156,

    153, 152, 149, 148, 145, 144, 141, 140, 137, 136, 133, 132,

    131, 130, 127, 126, 123, 122, 121, 120, 117, 116, 115, 114,

    111, 110, 109, 108, 103, 102, 99, 98, 93, 92, 89, 88, 83,

    82, 79, 78, 75, 74, 71, 70, 67, 66, 63, 62, 59, 58, 55,

    54, 53, 52, 49, 48, 45, 44, 43, 42, 39, 38, 37, 36, 33,

    32, 31, 30, 27, 26, 25, 24, 23, 22, 19, 18, 17, 16, 15,

    14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2

};



uint32_t helper_qseed(CPUTriCoreState *env, uint32_t r1)

{

    uint32_t arg1, S, E, M, E_minus_one, m_idx;

    uint32_t new_E, new_M, new_S, result;



    arg1 = make_float32(r1);



    /* fetch IEEE-754 fields S, E and the uppermost 6-bit of M */

    S = extract32(arg1, 31, 1);

    E = extract32(arg1, 23, 8);

    M = extract32(arg1, 17, 6);



    if (float32_is_any_nan(arg1)) {

        result = float32_quiet_nan;

    } else if (float32_is_zero_or_denormal(arg1)) {

        if (float32_is_neg(arg1)) {

            result = float32_infinity | (1 << 31);

        } else {

            result = float32_infinity;

        }

    } else if (float32_is_neg(arg1)) {

        result = float32_sqrt_nan;

    } else if (float32_is_infinity(arg1)) {

        result = float32_zero;

    } else {

        E_minus_one = E - 1;

        m_idx = ((E_minus_one & 1) << 6) | M;

        new_S = S;

        new_E = 0xBD - E_minus_one / 2;

        new_M = target_qseed_significand_table[m_idx];



        result = 0;

        result = deposit32(result, 31, 1, new_S);

        result = deposit32(result, 23, 8, new_E);

        result = deposit32(result, 15, 8, new_M);

    }



    if (float32_is_signaling_nan(arg1, &env->fp_status)

        || result == float32_sqrt_nan) {

        env->FPU_FI = 1 << 31;

        env->FPU_FS = 1;

    } else {

        env->FPU_FS = 0;

    }



    return (uint32_t) result;

}



uint32_t helper_fdiv(CPUTriCoreState *env, uint32_t r1, uint32_t r2)

{

    uint32_t flags;

target/tricore/helper.h

+1 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ DEF_HELPER_3(fdiv, i32, env, i32, i32) 
DEF_HELPER_4(fmadd, i32, env, i32, i32, i32)

DEF_HELPER_4(fmsub, i32, env, i32, i32, i32)

DEF_HELPER_3(fcmp, i32, env, i32, i32)

DEF_HELPER_2(qseed, i32, env, i32)

DEF_HELPER_2(ftoi, i32, env, i32)

DEF_HELPER_2(itof, i32, env, i32)

DEF_HELPER_2(utof, i32, env, i32)

target/tricore/translate.c

+3 −0
Original line number Diff line number Diff line
@@ -6753,6 +6753,9 @@ static void decode_rr_divide(CPUTriCoreState *env, DisasContext *ctx) 
    case OPC2_32_RR_FTOIZ:

        gen_helper_ftoiz(cpu_gpr_d[r3], cpu_env, cpu_gpr_d[r1]);

        break;

    case OPC2_32_RR_QSEED_F:

        gen_helper_qseed(cpu_gpr_d[r3], cpu_env, cpu_gpr_d[r1]);

        break;

    default:

        generate_trap(ctx, TRAPC_INSN_ERR, TIN2_IOPC);

    }