s3c2410a Samsung Semiconductor, Inc., s3c2410a Datasheet - Page 95
s3c2410a
Manufacturer Part Number
s3c2410a
Description
16/32-bit Risc Arm Microprocessor
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.S3C2410A.pdf
(599 pages)
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S3C2410A
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 2's complement notation. For example, ASR #5 is shown in Figure
3-8.
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.
31
31
0
30
0
0
0
0
Figure 3-8. Arithmetic Shift Right
Figure 3-7. Logical Shift Right
Value of Operand 2
Value of Operand 2
Contents of Rm
Contents of Rm
5
5
4
4
ARM INSTRUCTION SET
carry out
carry out
0
0
3-13
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