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參數(shù)資料
| 型號： | ARM60 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Low power, general purpose 32-bit RISC microprocessor |
| 中文描述： | 低功耗，通用32位RISC微處理器 |
| 文件頁數(shù)： | 38/120頁 |
| 文件大?。?/td> | 1275K |
| 代理商： | ARM60 |
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P60ARM-B
34
4.6 Multiply and Multiply-Accumulate (MUL, MLA)
The instruction is only executed if the condition is true. The various conditions are defined at the beginning
of this chapter. The instruction encoding is shown in
Figure 16: Multiply Instructions
.
The multiply and multiply-accumulate instructions use a 2 bit Booth's algorithm to perform integer
multiplication. They give the least significant 32 bits of the product of two 32 bit operands, and may be used
to synthesize higher precision multiplications.
Figure 16: Multiply Instructions
The multiply form of the instruction gives Rd:=Rm*Rs. Rn is ignored, and should be set to zero for
compatibility with possible future upgrades to the instruction set.
The multiply-accumulate form gives Rd:=Rm*Rs+Rn, which can save an explicit ADD instruction in some
circumstances.
Both forms of the instruction work on operands which may be considered as signed (2's complement) or
unsigned integers.
4.6.1 Operand restrictions
Due to the way multiplication is implemented, certain combinations of operand registers should be
avoided. (The assembler will issue a warning if these restrictions are overlooked.)
The destination register (Rd) should not be the same as the Rm operand register, as Rd is used to hold
intermediate values and Rm is used repeatedly during the multiply. A MUL will give a zero result if
Rm=Rd, and a MLA will give a meaningless result. R15 shall not be used as an operand or as the destination
register.
All other register combinations will give correct results, and Rd, Rn and Rs may use the same register when
required.
Cond
0 0 0 0 0 0 A S
Rd
Rn
Rs
1
0 0
1
Rm
0
3
4
7
8
11
12
15
16
19
20
21
22
27
28
31
Operand registers
Destination register
Set condition code
0 = do not alter condition codes
1 = set condition codes
Accumulate
0 = multiply only
1 = multiply and accumulate
Condition Field
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