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EMUL
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Signed multiplication
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EMUL
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Extended MULtiply, signed
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[Syntax]
EMUL src, dest
[Operation]
dest2:dest = dest * src;
[Function]
- | This instruction multiplies dest by src, treating both as signed values. |
- | The calculation is performed on src and dest as 32-bit operands to obtain a 64-bit result, which is placed in the register pair, dest2:dest (R(n+1):Rn). |
- | Any of the 15 general registers (Rn (n: 0 to 14)) is specifiable for dest. |
Note | The accumulator (ACC) is used to perform the function. The value of ACC after executing the instruction is undefined. |
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Register Specified for dest
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R0
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R1
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R2
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R3
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R4
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R5
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R6
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R7
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R8
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R9
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R10
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R11
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R12
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R13
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R14
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[Instruction Format]
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EMUL src, dest
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#SIMM:8
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Rd (Rd=R0~R14)
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#SIMM:16
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Rd (Rd=R0~R14)
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#SIMM:24
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Rd (Rd=R0~R14)
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#IMM:32
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Rd (Rd=R0~R14)
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Rs
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Rd (Rd=R0~R14)
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[Rs].memex
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Rd (Rd=R0~R14)
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dsp:8[Rs].memex
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Rd (Rd=R0~R14)
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dsp:16[Rs]memex
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Rd (Rd=R0~R14)
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[Flag Change]
This instruction does not affect the states of flags.
[Description Example]
EMUL #10, R2
EMUL R1, R2
EMUL [R1], R2
EMUL 8[R1].W, R2