Commit 1ee2d7ba authored by David Hildenbrand's avatar David Hildenbrand
Browse files

s390x/tcg: Implement VECTOR SUBTRACT COMPUTE BORROW INDICATION 



Let's keep it simple for now and handle 8/16 bit elements via helpers.
Especially for 8/16, we could come up with some bit tricks.

Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
parent ea8d7840

target/s390x/helper.h

+2 −0
Original line number Diff line number Diff line
@@ -207,6 +207,8 @@ DEF_HELPER_FLAGS_4(gvec_verim16, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32) 
DEF_HELPER_FLAGS_4(gvec_vsl, TCG_CALL_NO_RWG, void, ptr, cptr, i64, i32)

DEF_HELPER_FLAGS_4(gvec_vsra, TCG_CALL_NO_RWG, void, ptr, cptr, i64, i32)

DEF_HELPER_FLAGS_4(gvec_vsrl, TCG_CALL_NO_RWG, void, ptr, cptr, i64, i32)

DEF_HELPER_FLAGS_4(gvec_vscbi8, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)

DEF_HELPER_FLAGS_4(gvec_vscbi16, TCG_CALL_NO_RWG, void, ptr, cptr, cptr, i32)



#ifndef CONFIG_USER_ONLY

DEF_HELPER_3(servc, i32, env, i64, i64)

target/s390x/insn-data.def

+2 −0
Original line number Diff line number Diff line
@@ -1176,6 +1176,8 @@ 
    F(0xe77d, VSRLB,   VRR_c, V,   0, 0, 0, 0, vsrl, 0, IF_VEC)

/* VECTOR SUBTRACT */

    F(0xe7f7, VS,      VRR_c, V,   0, 0, 0, 0, vs, 0, IF_VEC)

/* VECTOR SUBTRACT COMPUTE BORROW INDICATION */

    F(0xe7f5, VSCBI,   VRR_c, V,   0, 0, 0, 0, vscbi, 0, IF_VEC)



#ifndef CONFIG_USER_ONLY

/* COMPARE AND SWAP AND PURGE */

target/s390x/translate_vx.inc.c

+52 −0
Original line number Diff line number Diff line
@@ -2140,3 +2140,55 @@ static DisasJumpType op_vs(DisasContext *s, DisasOps *o) 
                  get_field(s->fields, v3));

    return DISAS_NEXT;

}



static void gen_scbi_i32(TCGv_i32 d, TCGv_i32 a, TCGv_i32 b)

{

    tcg_gen_setcond_i32(TCG_COND_LTU, d, a, b);

}



static void gen_scbi_i64(TCGv_i64 d, TCGv_i64 a, TCGv_i64 b)

{

    tcg_gen_setcond_i64(TCG_COND_LTU, d, a, b);

}



static void gen_scbi2_i64(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 al,

                          TCGv_i64 ah, TCGv_i64 bl, TCGv_i64 bh)

{

    TCGv_i64 th = tcg_temp_new_i64();

    TCGv_i64 tl = tcg_temp_new_i64();

    TCGv_i64 zero = tcg_const_i64(0);



    tcg_gen_sub2_i64(tl, th, al, zero, bl, zero);

    tcg_gen_andi_i64(th, th, 1);

    tcg_gen_sub2_i64(tl, th, ah, zero, th, zero);

    tcg_gen_sub2_i64(tl, th, tl, th, bh, zero);

    tcg_gen_andi_i64(dl, th, 1);

    tcg_gen_mov_i64(dh, zero);



    tcg_temp_free_i64(th);

    tcg_temp_free_i64(tl);

    tcg_temp_free_i64(zero);

}



static DisasJumpType op_vscbi(DisasContext *s, DisasOps *o)

{

    const uint8_t es = get_field(s->fields, m4);

    static const GVecGen3 g[4] = {

        { .fno = gen_helper_gvec_vscbi8, },

        { .fno = gen_helper_gvec_vscbi16, },

        { .fni4 = gen_scbi_i32, },

        { .fni8 = gen_scbi_i64, },

    };



    if (es > ES_128) {

        gen_program_exception(s, PGM_SPECIFICATION);

        return DISAS_NORETURN;

    } else if (es == ES_128) {

        gen_gvec128_3_i64(gen_scbi2_i64, get_field(s->fields, v1),

                          get_field(s->fields, v2), get_field(s->fields, v3));

        return DISAS_NEXT;

    }

    gen_gvec_3(get_field(s->fields, v1), get_field(s->fields, v2),

               get_field(s->fields, v3), &g[es]);

    return DISAS_NEXT;

}

target/s390x/vec_int_helper.c

+16 −0
Original line number Diff line number Diff line
@@ -567,3 +567,19 @@ void HELPER(gvec_vsrl)(void *v1, const void *v2, uint64_t count, 
{

    s390_vec_shr(v1, v2, count);

}



#define DEF_VSCBI(BITS)                                                        \

void HELPER(gvec_vscbi##BITS)(void *v1, const void *v2, const void *v3,        \

                              uint32_t desc)                                   \

{                                                                              \

    int i;                                                                     \

                                                                               \

    for (i = 0; i < (128 / BITS); i++) {                                       \

        const uint##BITS##_t a = s390_vec_read_element##BITS(v2, i);           \

        const uint##BITS##_t b = s390_vec_read_element##BITS(v3, i);           \

                                                                               \

        s390_vec_write_element##BITS(v1, i, a < b);                            \

    }                                                                          \

}

DEF_VSCBI(8)

DEF_VSCBI(16)