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target-ppc: Introduce DFP Decode DPD to BCD 

Add emulation of the Power PC Decimal Floating Point Decode
Densely Packed Decimal to Binary Coded Decimal instructions
ddedpd[q][.].

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-04-21 15:55:17 -05:00 committed by Alexander Graf
parent bea0dd7912
commit 7796676fdd
3 changed files with 72 additions and 0 deletions
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66
target-ppc/dfp_helper.c
View File

@ -983,3 +983,69 @@ void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b) \
DFP_HELPER_CTFIX(dctfix, 64)
DFP_HELPER_CTFIX(dctfixq, 128)
static inline void dfp_set_bcd_digit_64(uint64_t *t, uint8_t digit,
unsigned n)
{
*t |= ((uint64_t)(digit & 0xF) << (n << 2));
}
static inline void dfp_set_bcd_digit_128(uint64_t *t, uint8_t digit,
unsigned n)
{
t[(n & 0x10) ? HI_IDX : LO_IDX] |=
((uint64_t)(digit & 0xF) << ((n & 15) << 2));
}
static inline void dfp_set_sign_64(uint64_t *t, uint8_t sgn)
{
*t <<= 4;
*t |= (sgn & 0xF);
}
static inline void dfp_set_sign_128(uint64_t *t, uint8_t sgn)
{
t[HI_IDX] <<= 4;
t[HI_IDX] |= (t[LO_IDX] >> 60);
t[LO_IDX] <<= 4;
t[LO_IDX] |= (sgn & 0xF);
}
#define DFP_HELPER_DEDPD(op, size) \
void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t sp) \
{ \
struct PPC_DFP dfp; \
uint8_t digits[34]; \
int i, N; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
decNumberGetBCD(&dfp.b, digits); \
dfp.t64[0] = dfp.t64[1] = 0; \
N = dfp.b.digits; \
\
for (i = 0; (i < N) && (i < (size)/4); i++) { \
dfp_set_bcd_digit_##size(dfp.t64, digits[N-i-1], i); \
} \
\
if (sp & 2) { \
uint8_t sgn; \
\
if (decNumberIsNegative(&dfp.b)) { \
sgn = 0xD; \
} else { \
sgn = ((sp & 1) ? 0xF : 0xC); \
} \
dfp_set_sign_##size(dfp.t64, sgn); \
} \
\
if (size == 64) { \
t[0] = dfp.t64[0]; \
} else if (size == 128) { \
t[0] = dfp.t64[HI_IDX]; \
t[1] = dfp.t64[LO_IDX]; \
} \
}
DFP_HELPER_DEDPD(ddedpd, 64)
DFP_HELPER_DEDPD(ddedpdq, 128)

2
target-ppc/helper.h
View File

@ -654,3 +654,5 @@ DEF_HELPER_3(dcffix, void, env, fprp, fprp)
DEF_HELPER_3(dcffixq, void, env, fprp, fprp)
DEF_HELPER_3(dctfix, void, env, fprp, fprp)
DEF_HELPER_3(dctfixq, void, env, fprp, fprp)
DEF_HELPER_4(ddedpd, void, env, fprp, fprp, i32)
DEF_HELPER_4(ddedpdq, void, env, fprp, fprp, i32)

4
target-ppc/translate.c
View File

@ -8394,6 +8394,8 @@ GEN_DFP_T_B_Rc(dcffix)
GEN_DFP_T_B_Rc(dcffixq)
GEN_DFP_T_B_Rc(dctfix)
GEN_DFP_T_B_Rc(dctfixq)
GEN_DFP_T_FPR_I32_Rc(ddedpd, rB, SP)
GEN_DFP_T_FPR_I32_Rc(ddedpdq, rB, SP)
/*** SPE extension ***/
/* Register moves */
@ -11359,6 +11361,8 @@ GEN_DFP_T_B_Rc(dcffix, 0x02, 0x19),
GEN_DFP_Tp_B_Rc(dcffixq, 0x02, 0x19),
GEN_DFP_T_B_Rc(dctfix, 0x02, 0x09),
GEN_DFP_T_Bp_Rc(dctfixq, 0x02, 0x09),
GEN_DFP_SP_T_B_Rc(ddedpd, 0x02, 0x0a),
GEN_DFP_SP_Tp_Bp_Rc(ddedpdq, 0x02, 0x0a),
#undef GEN_SPE
#define GEN_SPE(name0, name1, opc2, opc3, inval0, inval1, type) \
GEN_OPCODE_DUAL(name0##_##name1, 0x04, opc2, opc3, inval0, inval1, type, PPC_NONE)