Commit e2106d73 authored by Jose Ricardo Ziviani's avatar Jose Ricardo Ziviani Committed by David Gibson
Browse files

target-ppc: Implement bcdctn. instruction 



bcdctn. converts from BCD to National numeric format. National format
uses a byte to represent a digit where the most significant nibble is
always 0x3 and the least sign. nibbles is the digit itself.

Signed-off-by: default avatarJose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
parent b8155872

target-ppc/helper.h

+1 −0
Original line number Diff line number Diff line
@@ -379,6 +379,7 @@ DEF_HELPER_4(vpermxor, void, avr, avr, avr, avr) 
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_2(xsadddp, void, env, i32)

DEF_HELPER_2(xssubdp, void, env, i32)

target-ppc/int_helper.c

+43 −0
Original line number Diff line number Diff line
@@ -2578,6 +2578,15 @@ static uint16_t get_national_digit(ppc_avr_t *reg, int n) 
#endif

}



static void set_national_digit(ppc_avr_t *reg, uint8_t val, int n)

{

#if defined(HOST_WORDS_BIGENDIAN)

    reg->u16[8 - n] = val;

#else

    reg->u16[n] = val;

#endif

}



static int bcd_cmp_mag(ppc_avr_t *a, ppc_avr_t *b)

{

    int i;
@@ -2744,6 +2753,40 @@ uint32_t helper_bcdcfn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps) 
    return cr;

}



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

{

    int i;

    int cr = 0;

    int sgnb = bcd_get_sgn(b);

    int invalid = (sgnb == 0);

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



    int ox_flag = (b->u64[HI_IDX] != 0) || ((b->u64[LO_IDX] >> 32) != 0);



    for (i = 1; i < 8; i++) {

        set_national_digit(&ret, 0x30 + bcd_get_digit(b, i, &invalid), i);



        if (unlikely(invalid)) {

            break;

        }

    }

    set_national_digit(&ret, (sgnb == -1) ? NATIONAL_NEG : NATIONAL_PLUS, 0);



    cr = bcd_cmp_zero(b);



    if (ox_flag) {

        cr |= 1 << CRF_SO;

    }



    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

+4 −0
Original line number Diff line number Diff line
@@ -986,10 +986,14 @@ static void gen_##op(DisasContext *ctx) \ 
GEN_BCD(bcdadd)

GEN_BCD(bcdsub)

GEN_BCD2(bcdcfn)

GEN_BCD2(bcdctn)



static void gen_xpnd04_1(DisasContext *ctx)

{

    switch (opc4(ctx->opcode)) {

    case 5:

        gen_bcdctn(ctx);

        break;

    case 7:

        gen_bcdcfn(ctx);

        break;