參數(shù)資料
型號: ARM610
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): 41/173頁
文件大?。?/td> 897K
代理商: ARM610
Instruction Set - Shifts
ARM610 Data Sheet
4-13
O
The form of the shift field which might be expected to correspond to LSR #0 is used to
encode LSR #32, which has a zero result with bit 31 of Rm as the carry output. Logical
shift right zero is redundant as it is the same as logical shift left zero, so the assembler
will convert LSR #0 (and ASR #0 and ROR #0) into LSL #0, and allow LSR #32 to be
specified.
An arithmetic shift right (ASR) is similar to logical shift right, except that the high bits
are filled with bit 31 of Rm instead of zeros. This preserves the sign in two’s
complement notation. For example, ASR #5 is shown in
·
Figure 4-7: Arithmetic shift
right
Figure 4-7: Arithmetic shift right
The form of the shift field which might be expected to give ASR #0 is used to encode
ASR #32. Bit 31 of Rm is again used as the carry output, and each bit of operand 2 is
also equal to bit 31 of Rm. The result is therefore all ones or all zeros, according to the
value of bit 31 of Rm.
Rotate right (ROR) operations reuse the bits which “overshoot” in a logical shift right
operation by reintroducing them at the high end of the result, in place of the zeros used
to fill the high end in logical right operations. For example, ROR #5 is shown in
·
Figure
4-8: Rotate righton page 4-13.
Figure 4-8: Rotate right
31 30
5
4
0
contents of Rm
value of operand 2
carry out
31
5
4
0
contents of Rm
value of operand 2
carry out
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