Commit 48390a7c authored by David Hildenbrand's avatar David Hildenbrand
Browse files

s390x/tcg: Implement VECTOR SUBTRACT WITH BORROW INDICATION 



Fairly easy as only 128-bit handling is required. Simply perform the
subtraction and then subtract the borrow.

Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
parent 1ee2d7ba

target/s390x/insn-data.def

+2 −0
Original line number Diff line number Diff line
@@ -1178,6 +1178,8 @@ 
    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)

/* VECTOR SUBTRACT WITH BORROW INDICATION */

    F(0xe7bf, VSBI,    VRR_d, V,   0, 0, 0, 0, vsbi, 0, IF_VEC)



#ifndef CONFIG_USER_ONLY

/* COMPARE AND SWAP AND PURGE */

target/s390x/translate_vx.inc.c

+26 −0
Original line number Diff line number Diff line
@@ -2192,3 +2192,29 @@ static DisasJumpType op_vscbi(DisasContext *s, DisasOps *o) 
               get_field(s->fields, v3), &g[es]);

    return DISAS_NEXT;

}



static void gen_sbi2_i64(TCGv_i64 dl, TCGv_i64 dh, TCGv_i64 al, TCGv_i64 ah,

                         TCGv_i64 bl, TCGv_i64 bh, TCGv_i64 cl, TCGv_i64 ch)

{

    TCGv_i64 tl = tcg_temp_new_i64();

    TCGv_i64 zero = tcg_const_i64(0);



    tcg_gen_andi_i64(tl, cl, 1);

    tcg_gen_sub2_i64(dl, dh, al, ah, bl, bh);

    tcg_gen_sub2_i64(dl, dh, dl, dh, tl, zero);

    tcg_temp_free_i64(tl);

    tcg_temp_free_i64(zero);

}



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

{

    if (get_field(s->fields, m5) != ES_128) {

        gen_program_exception(s, PGM_SPECIFICATION);

        return DISAS_NORETURN;

    }



    gen_gvec128_4_i64(gen_sbi2_i64, get_field(s->fields, v1),

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

                      get_field(s->fields, v4));

    return DISAS_NEXT;

}