Commit 38f4cb04 authored by Jose Ricardo Ziviani's avatar Jose Ricardo Ziviani Committed by David Gibson
Browse files

target-ppc: Implement bcdcfz. instruction 



bcdcfz. converts from Zoned numeric format to BCD. Zoned format uses
a byte to represent a digit where the most significant nibble is 0x3
or 0xf, depending on the preferred signal.

Signed-off-by: default avatarJose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent e2106d73

target-ppc/helper.h

+1 −0
Original line number Diff line number Diff line
@@ -380,6 +380,7 @@ DEF_HELPER_4(bcdadd, i32, avr, avr, avr, i32) 
DEF_HELPER_4(bcdsub, i32, avr, avr, avr, i32)

DEF_HELPER_3(bcdcfn, i32, avr, avr, i32)

DEF_HELPER_3(bcdctn, i32, avr, avr, i32)

DEF_HELPER_3(bcdcfz, i32, avr, avr, i32)



DEF_HELPER_2(xsadddp, void, env, i32)

DEF_HELPER_2(xssubdp, void, env, i32)

target-ppc/int_helper.c

+44 −0
Original line number Diff line number Diff line
@@ -2787,6 +2787,50 @@ uint32_t helper_bcdctn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps) 
    return cr;

}



uint32_t helper_bcdcfz(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)

{

    int i;

    int cr = 0;

    int invalid = 0;

    int zone_digit = 0;

    int zone_lead = ps ? 0xF : 0x3;

    int digit = 0;

    ppc_avr_t ret = { .u64 = { 0, 0 } };

    int sgnb = b->u8[BCD_DIG_BYTE(0)] >> 4;



    if (unlikely((sgnb < 0xA) && ps)) {

        invalid = 1;

    }



    for (i = 0; i < 16; i++) {

        zone_digit = (i * 2) ? b->u8[BCD_DIG_BYTE(i * 2)] >> 4 : zone_lead;

        digit = b->u8[BCD_DIG_BYTE(i * 2)] & 0xF;

        if (unlikely(zone_digit != zone_lead || digit > 0x9)) {

            invalid = 1;

            break;

        }



        bcd_put_digit(&ret, digit, i + 1);

    }



    if ((ps && (sgnb == 0xB || sgnb == 0xD)) ||

            (!ps && (sgnb & 0x4))) {

        bcd_put_digit(&ret, BCD_NEG_PREF, 0);

    } else {

        bcd_put_digit(&ret, BCD_PLUS_PREF_1, 0);

    }



    cr = bcd_cmp_zero(&ret);



    if (unlikely(invalid)) {

        cr = 1 << CRF_SO;

    }



    *r = ret;



    return cr;

}



void helper_vsbox(ppc_avr_t *r, ppc_avr_t *a)

{

    int i;

target-ppc/translate/vmx-impl.inc.c

+7 −0
Original line number Diff line number Diff line
@@ -987,6 +987,7 @@ GEN_BCD(bcdadd) 
GEN_BCD(bcdsub)

GEN_BCD2(bcdcfn)

GEN_BCD2(bcdctn)

GEN_BCD2(bcdcfz)



static void gen_xpnd04_1(DisasContext *ctx)

{
@@ -994,6 +995,9 @@ static void gen_xpnd04_1(DisasContext *ctx) 
    case 5:

        gen_bcdctn(ctx);

        break;

    case 6:

        gen_bcdcfz(ctx);

        break;

    case 7:

        gen_bcdcfn(ctx);

        break;
@@ -1006,6 +1010,9 @@ static void gen_xpnd04_1(DisasContext *ctx) 
static void gen_xpnd04_2(DisasContext *ctx)

{

    switch (opc4(ctx->opcode)) {

    case 6:

        gen_bcdcfz(ctx);

        break;

    case 7:

        gen_bcdcfn(ctx);

        break;