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 <tommu...@gmail.com>
---
target-ppc/dfp_helper.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++
target-ppc/helper.h | 2 +
target-ppc/translate.c | 4 +++
3 files changed, 72 insertions(+), 0 deletions(-)
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c
index bf30bd8..174db20 100644
--- a/target-ppc/dfp_helper.c
+++ b/target-ppc/dfp_helper.c
@@ -993,3 +993,69 @@ 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)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 30ba9d9..0d5acf5 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -656,4 +656,6 @@ 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)
#include "exec/def-helper.h"
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 3f2f649..395a048 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -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)
--
1.7.1
