參數(shù)資料
型號: P60ARM-GP1N
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): 67/120頁
文件大?。?/td> 1275K
代理商: P60ARM-GP1N
Instruction Set - Examples
63
(4)
Multiplication by 6
ADD
MOV
Ra,Ra,Ra,LSL #1
Ra,Ra,LSL#1
; multiply by 3
; and then by 2
(5)
Multiply by 10 and add in extra number
ADD
ADD
Ra,Ra,Ra,LSL#2
Ra,Rc,Ra,LSL#1
; multiply by 5
; multiply by 2 and add in next digit
(6)
General recursive method for Rb := Ra*C, C a constant:
(a)
If C even, say C = 2^n*D, D odd:
D=1:
D<>1:
MOV Rb,Ra,LSL #n
{Rb := Ra*D}
MOV
Rb,Rb,LSL #n
(b)
If C MOD 4 = 1, say C = 2^n*D+1, D odd, n>1:
D=1:
D<>1:
ADD Rb,Ra,Ra,LSL #n
{Rb := Ra*D}
ADD
Rb,Ra,Rb,LSL #n
(c)
If C MOD 4 = 3, say C = 2^n*D-1, D odd, n>1:
D=1:
D<>1:
RSB Rb,Ra,Ra,LSL #n
{Rb := Ra*D}
RSB
Rb,Ra,Rb,LSL #n
This is not quite optimal, but close. An example of its non-optimality is multiply by 45 which is done by:
RSB
RSB
ADD
Rb,Ra,Ra,LSL#2
Rb,Ra,Rb,LSL#2
Rb,Ra,Rb,LSL# 2
; multiply by 3
; multiply by 4*3-1 = 11
; multiply by 4*11+1 = 45
rather than by:
ADD
ADD
Rb,Ra,Ra,LSL#3
Rb,Rb,Rb,LSL#2
; multiply by 9
; multiply by 5*9 = 45
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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