diff options
Diffstat (limited to 'trunk/src/emu/cpu/dsp56k/pmove.c')
-rw-r--r-- | trunk/src/emu/cpu/dsp56k/pmove.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/trunk/src/emu/cpu/dsp56k/pmove.c b/trunk/src/emu/cpu/dsp56k/pmove.c new file mode 100644 index 00000000000..a3f6a0dada4 --- /dev/null +++ b/trunk/src/emu/cpu/dsp56k/pmove.c @@ -0,0 +1,78 @@ +#include "pmove.h" + +namespace DSP56K +{ + +const reg_id& ParallelMove::opSource() const { return m_oco->instSource(); } +const reg_id& ParallelMove::opDestination() const { return m_oco->instDestination(); } +const size_t ParallelMove::opAccumulatorBitsModified() const { return m_oco->instAccumulatorBitsModified(); } + + +ParallelMove* ParallelMove::decodeParallelMove(const Opcode* opc, const UINT16 word0, const UINT16 word1) +{ + const UINT16 w0 = word0; + const UINT16 w1 = word1; + + /* Dual X Memory Data Read : 011m mKKK .rr. .... : A-142*/ + if ((w0 & 0xe000) == 0x6000) + { + return global_alloc(DualXMemoryDataRead(opc, w0, w1)); + } + /* X Memory Data Write and Register Data Move : 0001 011k RRDD .... : A-140 */ + else if ((w0 & 0xfe00) == 0x1600) + { + return global_alloc(XMemoryDataWriteAndRegisterDataMove(opc, w0, w1)); + } + else + { + /* 32 General parallel move operations */ + /* Note: It's important that NPDM comes before RtRDM */ + + /* No Parallel Data Move : 0100 1010 .... .... : A-131 */ + if ((w0 & 0xff00) == 0x4a00) + { + return NULL; + } + /* Register to Register Data Move : 0100 IIII .... .... : A-133 */ + else if ((w0 & 0xf000) == 0x4000) + { + return global_alloc(RegisterToRegisterDataMove(opc, w0, w1)); + } + /* Address Register Update : 0011 0zRR .... .... : A-135 */ + else if ((w0 & 0xf800) == 0x3000) + { + return global_alloc(AddressRegisterUpdate(opc, w0, w1)); + } + /* X Memory Data Move : 1mRR HHHW .... .... : A-137 */ + else if ((w0 & 0x8000) == 0x8000) + { + return global_alloc(XMemoryDataMove(opc, w0, w1)); + } + /* X Memory Data Move : 0101 HHHW .... .... : A-137 */ + else if ((w0 & 0xf000) == 0x5000) + { + return global_alloc(XMemoryDataMove_2(opc, w0, w1)); + } + /* X Memory Data Move with short displacement : 0000 0101 BBBB BBBB ---- HHHW .... .... : A-139 */ + else if ((w0 & 0xff00) == 0x0500) + { + // Now check it against all potential double-ups. + // These operations can't have an additional parallel move. + // + // MOVE(M) : 0000 0101 BBBB BBBB 0000 001W --0- -HHH : A-152 + // MOVE(C) : 0000 0101 BBBB BBBB 0011 1WDD DDD0 ---- : A-144 + // MOVE : 0000 0101 BBBB BBBB ---- HHHW 0001 0001 : A-128 + // + if (((w1 & 0xfe20) != 0x0200) && + ((w1 & 0xf810) != 0x3800) && + ((w1 & 0x00ff) != 0x0011)) + { + return global_alloc(XMemoryDataMoveWithShortDisplacement(opc, w0, w1)); + } + } + } + + return NULL; +} + +} |