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target-ppc: Implement bcdcfn. instruction

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bcdcfn. converts from National numeric format to BCD. 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>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Jose Ricardo Ziviani 2016-11-08 14:50:22 -02:00 committed by David Gibson
parent e0aa311673
commit b81558724f
4 changed files with 114 additions and 2 deletions
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1
target-ppc/helper.h
View File

@ -378,6 +378,7 @@ 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_2(xsadddp, void, env, i32)
DEF_HELPER_2(xssubdp, void, env, i32)

56
target-ppc/int_helper.c
View File

@ -2492,6 +2492,8 @@ void helper_vsubecuq(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c)
#define BCD_NEG_PREF 0xD
#define BCD_NEG_ALT 0xB
#define BCD_PLUS_ALT_2 0xE
#define NATIONAL_PLUS 0x2B
#define NATIONAL_NEG 0x2D
#if defined(HOST_WORDS_BIGENDIAN)
#define BCD_DIG_BYTE(n) (15 - (n/2))
@ -2558,6 +2560,24 @@ static void bcd_put_digit(ppc_avr_t *bcd, uint8_t digit, int n)
}
}
static int bcd_cmp_zero(ppc_avr_t *bcd)
{
if (bcd->u64[HI_IDX] == 0 && (bcd->u64[LO_IDX] >> 4) == 0) {
return 1 << CRF_EQ;
} else {
return (bcd_get_sgn(bcd) == 1) ? 1 << CRF_GT : 1 << CRF_LT;
}
}
static uint16_t get_national_digit(ppc_avr_t *reg, int n)
{
#if defined(HOST_WORDS_BIGENDIAN)
return reg->u16[8 - n];
#else
return reg->u16[n];
#endif
}
static int bcd_cmp_mag(ppc_avr_t *a, ppc_avr_t *b)
{
int i;
@ -2688,6 +2708,42 @@ uint32_t helper_bcdsub(ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, uint32_t ps)
return helper_bcdadd(r, a, &bcopy, ps);
}
uint32_t helper_bcdcfn(ppc_avr_t *r, ppc_avr_t *b, uint32_t ps)
{
int i;
int cr = 0;
uint16_t national = 0;
uint16_t sgnb = get_national_digit(b, 0);
ppc_avr_t ret = { .u64 = { 0, 0 } };
int invalid = (sgnb != NATIONAL_PLUS && sgnb != NATIONAL_NEG);
for (i = 1; i < 8; i++) {
national = get_national_digit(b, i);
if (unlikely(national < 0x30 || national > 0x39)) {
invalid = 1;
break;
}
bcd_put_digit(&ret, national & 0xf, i);
}
if (sgnb == NATIONAL_PLUS) {
bcd_put_digit(&ret, (ps == 0) ? BCD_PLUS_PREF_1 : BCD_PLUS_PREF_2, 0);
} else {
bcd_put_digit(&ret, BCD_NEG_PREF, 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;

55
target-ppc/translate/vmx-impl.inc.c
View File

@ -960,8 +960,61 @@ static void gen_##op(DisasContext *ctx) \
tcg_temp_free_i32(ps); \
}
#define GEN_BCD2(op) \
static void gen_##op(DisasContext *ctx) \
{ \
TCGv_ptr rd, rb; \
TCGv_i32 ps; \
\
if (unlikely(!ctx->altivec_enabled)) { \
gen_exception(ctx, POWERPC_EXCP_VPU); \
return; \
} \
\
rb = gen_avr_ptr(rB(ctx->opcode)); \
rd = gen_avr_ptr(rD(ctx->opcode)); \
\
ps = tcg_const_i32((ctx->opcode & 0x200) != 0); \
\
gen_helper_##op(cpu_crf[6], rd, rb, ps); \
\
tcg_temp_free_ptr(rb); \
tcg_temp_free_ptr(rd); \
tcg_temp_free_i32(ps); \
}
GEN_BCD(bcdadd)
GEN_BCD(bcdsub)
GEN_BCD2(bcdcfn)
static void gen_xpnd04_1(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 7:
gen_bcdcfn(ctx);
break;
default:
gen_invalid(ctx);
break;
}
}
static void gen_xpnd04_2(DisasContext *ctx)
{
switch (opc4(ctx->opcode)) {
case 7:
gen_bcdcfn(ctx);
break;
default:
gen_invalid(ctx);
break;
}
}
GEN_VXFORM_DUAL(vsubcuw, PPC_ALTIVEC, PPC_NONE, \
xpnd04_1, PPC_NONE, PPC2_ISA300)
GEN_VXFORM_DUAL(vsubsws, PPC_ALTIVEC, PPC_NONE, \
xpnd04_2, PPC_NONE, PPC2_ISA300)
GEN_VXFORM_DUAL(vsububm, PPC_ALTIVEC, PPC_NONE, \
bcdadd, PPC_NONE, PPC2_ALTIVEC_207)
@ -1038,3 +1091,5 @@ GEN_VXFORM_DUAL(vsldoi, PPC_ALTIVEC, PPC_NONE,
#undef GEN_VXFORM_NOA
#undef GEN_VXFORM_UIMM
#undef GEN_VAFORM_PAIRED
#undef GEN_BCD2

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

@ -126,7 +126,7 @@ GEN_HANDLER_E_2(vprtybw, 0x4, 0x1, 0x18, 8, 0, PPC_NONE, PPC2_ISA300),
GEN_HANDLER_E_2(vprtybd, 0x4, 0x1, 0x18, 9, 0, PPC_NONE, PPC2_ISA300),
GEN_HANDLER_E_2(vprtybq, 0x4, 0x1, 0x18, 10, 0, PPC_NONE, PPC2_ISA300),
GEN_VXFORM(vsubcuw, 0, 22),
GEN_VXFORM_DUAL(vsubcuw, xpnd04_1, 0, 22, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM_DUAL(vaddubs, vmul10uq, 0, 8, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM_DUAL(vadduhs, vmul10euq, 0, 9, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM(vadduws, 0, 10),
@ -138,7 +138,7 @@ GEN_VXFORM_DUAL(vsubuhs, bcdsub, 0, 25, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM(vsubuws, 0, 26),
GEN_VXFORM(vsubsbs, 0, 28),
GEN_VXFORM(vsubshs, 0, 29),
GEN_VXFORM(vsubsws, 0, 30),
GEN_VXFORM_DUAL(vsubsws, xpnd04_2, 0, 30, PPC_ALTIVEC, PPC_NONE),
GEN_VXFORM_207(vadduqm, 0, 4),
GEN_VXFORM_207(vaddcuq, 0, 5),
GEN_VXFORM_DUAL(vaddeuqm, vaddecuq, 30, 0xFF, PPC_NONE, PPC2_ALTIVEC_207),