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target-ppc: Introduce Round to DFP Short/Long 

Add emulation of the PowerPC Round to DFP Short (drsp[.]) and Round to
DFP Long (drdpq[.]) instructions.

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 15:55:14 -05:00 committed by Alexander Graf
parent 290d9ee537
commit ca603eb4d7
3 changed files with 54 additions and 0 deletions
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48
target-ppc/dfp_helper.c
View File

@ -249,6 +249,20 @@ static void dfp_set_FPRF_from_FRT(struct PPC_DFP *dfp)
dfp_set_FPRF_from_FRT_with_context(dfp, &dfp->context);
}
static void dfp_set_FPRF_from_FRT_short(struct PPC_DFP *dfp)
{
decContext shortContext;
decContextDefault(&shortContext, DEC_INIT_DECIMAL32);
dfp_set_FPRF_from_FRT_with_context(dfp, &shortContext);
}
static void dfp_set_FPRF_from_FRT_long(struct PPC_DFP *dfp)
{
decContext longContext;
decContextDefault(&longContext, DEC_INIT_DECIMAL64);
dfp_set_FPRF_from_FRT_with_context(dfp, &longContext);
}
static void dfp_check_for_OX(struct PPC_DFP *dfp)
{
if (dfp->context.status & DEC_Overflow) {
@ -873,3 +887,37 @@ void helper_dctqpq(CPUPPCState *env, uint64_t *t, uint64_t *b)
t[0] = dfp.t64[HI_IDX];
t[1] = dfp.t64[LO_IDX];
}
void helper_drsp(CPUPPCState *env, uint64_t *t, uint64_t *b)
{
struct PPC_DFP dfp;
uint32_t t_short = 0;
dfp_prepare_decimal64(&dfp, 0, b, env);
decimal32FromNumber((decimal32 *)&t_short, &dfp.b, &dfp.context);
decimal32ToNumber((decimal32 *)&t_short, &dfp.t);
dfp_set_FPRF_from_FRT_short(&dfp);
dfp_check_for_OX(&dfp);
dfp_check_for_UX(&dfp);
dfp_check_for_XX(&dfp);
*t = t_short;
}
void helper_drdpq(CPUPPCState *env, uint64_t *t, uint64_t *b)
{
struct PPC_DFP dfp;
dfp_prepare_decimal128(&dfp, 0, b, env);
decimal64FromNumber((decimal64 *)&dfp.t64, &dfp.b, &dfp.context);
decimal64ToNumber((decimal64 *)&dfp.t64, &dfp.t);
dfp_check_for_VXSNAN_and_convert_to_QNaN(&dfp);
dfp_set_FPRF_from_FRT_long(&dfp);
dfp_check_for_OX(&dfp);
dfp_check_for_UX(&dfp);
dfp_check_for_XX(&dfp);
decimal64FromNumber((decimal64 *)dfp.t64, &dfp.t, &dfp.context);
t[0] = dfp.t64[0];
t[1] = 0;
}

2
target-ppc/helper.h
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@ -648,3 +648,5 @@ DEF_HELPER_5(drintn, void, env, fprp, fprp, i32, i32)
DEF_HELPER_5(drintnq, void, env, fprp, fprp, i32, i32)
DEF_HELPER_3(dctdp, void, env, fprp, fprp)
DEF_HELPER_3(dctqpq, void, env, fprp, fprp)
DEF_HELPER_3(drsp, void, env, fprp, fprp)
DEF_HELPER_3(drdpq, void, env, fprp, fprp)

4
target-ppc/translate.c
View File

@ -8388,6 +8388,8 @@ GEN_DFP_T_B_U32_U32_Rc(drintn, FPW, RMC)
GEN_DFP_T_B_U32_U32_Rc(drintnq, FPW, RMC)
GEN_DFP_T_B_Rc(dctdp)
GEN_DFP_T_B_Rc(dctqpq)
GEN_DFP_T_B_Rc(drsp)
GEN_DFP_T_B_Rc(drdpq)
/*** SPE extension ***/
/* Register moves */
@ -11347,6 +11349,8 @@ GEN_DFP_R_T_B_RMC_Rc(drintn, 0x03, 0x07),
GEN_DFP_R_Tp_Bp_RMC_Rc(drintnq, 0x03, 0x07),
GEN_DFP_T_B_Rc(dctdp, 0x02, 0x08),
GEN_DFP_Tp_B_Rc(dctqpq, 0x02, 0x08),
GEN_DFP_T_B_Rc(drsp, 0x02, 0x18),
GEN_DFP_Tp_Bp_Rc(drdpq, 0x02, 0x18),
#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)