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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: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Jose Ricardo Ziviani 2016-11-08 14:50:23 -02:00 committed by David Gibson
parent b81558724f
commit e2106d73d0
3 changed files with 48 additions and 0 deletions
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1
target-ppc/helper.h
View File

@ -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)

43
target-ppc/int_helper.c
View File

@ -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;

4
target-ppc/translate/vmx-impl.inc.c
View File

@ -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;