target-ppc: Introduce DFP Convert to Fixed

Add emulation of the PowerPC Decimal Floating Point Convert to
Fixed instructions dctfix[q][.].
Signed-off-by: NTom Musta <tommusta@gmail.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-ppc/dfp_helper.c

@@ -921,3 +921,29 @@ void helper_drdpq(CPUPPCState *env, uint64_t *t, uint64_t *b)
     t[0] = dfp.t64[0];
     t[1] = 0;
 }
+
+#define DFP_HELPER_CFFIX(op, size)                                             \
+void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b)                   \
+{                                                                              \
+    struct PPC_DFP dfp;                                                        \
+    dfp_prepare_decimal##size(&dfp, 0, b, env);                                \
+    decNumberFromInt64(&dfp.t, (int64_t)(*b));                                 \
+    decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
+    CFFIX_PPs(&dfp);                                                           \
+                                                                               \
+    if (size == 64) {                                                          \
+        t[0] = dfp.t64[0];                                                     \
+    } else if (size == 128) {                                                  \
+        t[0] = dfp.t64[HI_IDX];                                                \
+        t[1] = dfp.t64[LO_IDX];                                                \
+    }                                                                          \
+}
+
+static void CFFIX_PPs(struct PPC_DFP *dfp)
+{
+    dfp_set_FPRF_from_FRT(dfp);
+    dfp_check_for_XX(dfp);
+}
+
+DFP_HELPER_CFFIX(dcffix, 64)
+DFP_HELPER_CFFIX(dcffixq, 128)

target-ppc/helper.h

@@ -650,3 +650,5 @@ 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)
+DEF_HELPER_3(dcffix, void, env, fprp, fprp)
+DEF_HELPER_3(dcffixq, void, env, fprp, fprp)

target-ppc/translate.c

@@ -8390,6 +8390,8 @@ GEN_DFP_T_B_Rc(dctdp)
 GEN_DFP_T_B_Rc(dctqpq)
 GEN_DFP_T_B_Rc(drsp)
 GEN_DFP_T_B_Rc(drdpq)
+GEN_DFP_T_B_Rc(dcffix)
+GEN_DFP_T_B_Rc(dcffixq)
 /***                           SPE extension                               ***/
 /* Register moves */
 
@@ -11351,6 +11353,8 @@ 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),
+GEN_DFP_T_B_Rc(dcffix, 0x02, 0x19),
+GEN_DFP_Tp_B_Rc(dcffixq, 0x02, 0x19),
 #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)