asr
Arithmetic Shift Right (Immediate)
ASR <Wd>, <Wn>, #<shift>
Arithmetic shift right by immediate.
Pseudocode Operation
Wd ← Wn >> shift (arithmetic, sign-extended)Example
ASR w0, w1, #LSL
Encoding
Binary Layout
0
31
00
30:29
100110
28:23
0
22
immr
21:16
011111
15:10
Rn
9:5
Rd
4:0
Operands
-
Wd
Destination 32-bit integer register -
Wn
First source / base 32-bit integer register -
shift
Shift amount
Related
Other forms of asr
- asr Arithmetic Shift Right (Immediate 64-bit)
- asr Arithmetic Shift Right (Register)
- asr Arithmetic Shift Right (Register 64-bit)
- asr SVE Arithmetic Shift Right (Predicated)
- asr Arithmetic Shift Right (A32)
Across architectures
Logical and Arithmetic Shift : how x86, ARM, RISC-V, and PowerISA each do this.
More in Base
Reference
View in Arm A64 ISA Reference ↗
Arm A64 ISA
Instruction Forms
| Encoding | Instruction | ISA | Bit pattern | ||
|---|---|---|---|---|---|
| 0x1AC02800 | ASR <Wd>, <Wn>, <Wm> | A64 | 0 | 0 | 0 | 11010110 | Rm | 0010 | 10 | Rn | Rd | ||
| 0x9AC02800 | ASR <Xd>, <Xn>, <Xm> | A64 | 1 | 0 | 0 | 11010110 | Rm | 0010 | 10 | Rn | Rd | ||
| 0x13007C00 | ASR <Wd>, <Wn>, #<shift> | A64 | 0 | 00 | 100110 | 0 | immr | 011111 | Rn | Rd | ||
| 0x9340FC00 | ASR <Xd>, <Xn>, #<shift> | A64 | 1 | 00 | 100110 | 1 | immr | 111111 | Rn | Rd | ||
| 0x04008000 | ASR <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, #<const> | A64 | 00000100 | tszh | 00 | 0 | 0 | 0 | 0 | 100 | Pg | tszl | imm3 | Zdn | ||
| 0x04188000 | ASR <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.D | A64 | 00000100 | size | 011 | 0 | 0 | 0 | 100 | Pg | Zm | Zdn | ||
| 0x04108000 | ASR <Zdn>.<T>, <Pg>/M, <Zdn>.<T>, <Zm>.<T> | A64 | 00000100 | size | 010 | 0 | 0 | 0 | 100 | Pg | Zm | Zdn | ||
| 0x04209000 | ASR <Zd>.<T>, <Zn>.<T>, #<const> | A64 | 00000100 | tszh | 1 | tszl | imm3 | 1001 | 0 | 0 | Zn | Zd | ||
| 0x04208000 | ASR <Zd>.<T>, <Zn>.<T>, <Zm>.D | A64 | 00000100 | size | 1 | Zm | 1000 | 0 | 0 | Zn | Zd |
Description
Arithmetic Shift Right (immediate) shifts a register value right by an immediate number of bits, shifting in copies of the sign bit in the upper bits and zeros in the lower bits, and writes the result to the destination register.