Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 213)

Multiply Signed 16 MSB x Unsigned 16 MSB MPYHSU
3-153 Instruction Set SPRU733
Multiply Signed 16 MSB y Unsigned 16 MSB MPYHSU
Syntax MPYHSU (.unit) src1, src2, dst
.unit = .M1 or .M2
Compatibility C62x, C64x, C67x, and C67x+ CPU
Opcode
31 29 28 27 23 22 18 17 13 12 11 7 6 5 4 3 2 1 0
creg z dst src2 src1 x 0 0 0 1 1 0 0 0 0 0 s p
3 1 5 5 5 1 1 1
Opcode map field used... For operand type... Unit
src1
src2
dst smsb16
xumsb16
sint .M1, .M2
Description The signed operand src1 is multiplied by the unsigned operand src2. The result
is placed in dst. The S is needed in the mnemonic to specify a signed operand
when both signed and unsigned operands are used.
Execution if (cond) msb16(src1) × msb16(src2) → dst
else nop
Pipeline
Stage
E1 E2
Read src1, src2
Written dst
Unit in use .M
Instruction Type Multiply (16 × 16)
Delay Slots 1
See Also MPYH, MPYHU, MPYHUS
Example MPYHSU .M1 A1,A2,A3
Before instruction 2 cycles after instruction
A1 0023 0000h 35
†
A1 0023 0000h
A2 FFA7 FFFFh 65447 ‡ A2 FFA7 FFFFh
A3 xxxx xxxxh A3 0022 F3D5h 2290645
† Signed 16-MSB integer
‡ Unsigned 16-MSB integer
Pipeline