參數(shù)資料
型號(hào): P610ARM-FPNR
廠商: Zarlink Semiconductor Inc.
英文描述: General purpose 32-bit microprocessor
中文描述: 通用32位微處理器
文件頁數(shù): 39/173頁
文件大小: 897K
代理商: P610ARM-FPNR
Instruction Set - Shifts
ARM610 Data Sheet
4-11
O
Arithmetic operations
The arithmetic operations (SUB, RSB, ADD, ADC, SBC, RSC, CMP, CMN) treat each
operand as a 32-bit integer (either unsigned or two's complement signed, the two are
equivalent). If the S bit is set (and Rd is not R15) the V flag in the CPSR will be set if
an overflow occurs into bit 31 of the result; this may be ignored if the operands were
considered unsigned, but warns of a possible error if the operands were two's
complement signed. The C flag will be set to the carry out of bit 31 of the ALU, the Z
flag will be set if and only if the result was zero, and the N flag will be set to the value
of bit 31 of the result (indicating a negative result if the operands are considered to be
two's complement signed).
4.4.2 Shifts
When the second operand is specified to be a shifted register, the operation of the
barrel shifter is controlled by the Shift field in the instruction. This field indicates the
type of shift to be performed (logical left or right, arithmetic right or rotate right). The
amount by which the register should be shifted may be contained in an immediate field
in the instruction, or in the bottom byte of another register (other than R15). The
encoding for the different shift types is shown in
·
Figure 4-4: ARM shift operations
.
Figure 4-4: ARM shift operations
MOV
1101
operand2
(operand1 is ignored)
BIC
1110
operand1 AND NOT operand2
(Bit clear)
MVN
1111
NOT operand2
(operand1 is ignored)
Assembler
Mnemonic
OpCode
Action
Table 4-3: ARM Data processing instructions
11
7
6
5
4
0
11
8
7
6
5
4
Rs
0
1
Shift type
00= logical left
01= logical right
10= arithmetic right
11= rotate right
Shift amount
5-bit unsigned integer
Shift type
00= logical left
01= logical right
10= arithmetic right
11= rotate right
Shift amount
shift amount specified
in bottom byte of Rs
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