參數(shù)資料
型號: P60ARM-B
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): 68/120頁
文件大?。?/td> 1275K
代理商: P60ARM-B
P60ARM-B
64
4.15.4 Loading a word from an unknown alignment
; enter with address in Ra (32 bits)
; uses Rb, Rc; result in Rd.
; Note d must be less than c e.g. 0,1
;
; get word aligned address
; get 64 bits containing answer
; correction factor in bytes
; ...now in bits and test if aligned
; produce bottom of result word
; (if not aligned)
; get other shift amount
; combine two halves to get result
BIC
LDMIA
AND
MOVS
MOVNE
Rb,Ra,#3
Rb,{Rd,Rc}
Rb,Ra,#3
Rb,Rb,LSL#3
Rd,Rd,LSR Rb
RSBNE
ORRNE
Rb,Rb,#32
Rd,Rd,Rc,LSL Rb
4.15.5 Loading a halfword (Little Endian)
LDR
MOV
MOV
Ra, [Rb,#2]
Ra,Ra,LSL #16
Ra,Ra,LSR #16
; Get halfword to bits 15:0
; move to top
; and back to bottom
; use ASR to get sign extended version
4.15.6 Loading a halfword (Big Endian)
LDR
MOV
Ra, [Rb,#2]
Ra,Ra,LSR #16
; Get halfword to bits 31:16
; and back to bottom
; use ASR to get sign extended version
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參數(shù)描述
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