Shift Right and Insert (immediate). This instruction reads each vector element in the source SIMD&FP register, right shifts each vector element by an immediate value, and inserts the result into the corresponding vector element in the destination SIMD&FP register such that the new zero bits created by the shift are not inserted but retain their existing value. Bits shifted out of the right of each vector element of the source register are lost.
The following figure shows an example of the operation of shift right by 3 for an 8-bit vector element.
Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
It has encodings from 2 classes: Scalar and Vector
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | != 0000 | immb | 0 | 1 | 0 | 0 | 0 | 1 | Rn | Rd | |||||||||||||
| immh | |||||||||||||||||||||||||||||||
integer d = UInt(Rd); integer n = UInt(Rn); if immh<3> != '1' then UNDEFINED; integer esize = 8 << 3; integer datasize = esize; integer elements = 1; integer shift = (esize * 2) - UInt(immh:immb);
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | Q | 1 | 0 | 1 | 1 | 1 | 1 | 0 | != 0000 | immb | 0 | 1 | 0 | 0 | 0 | 1 | Rn | Rd | |||||||||||||
| immh | |||||||||||||||||||||||||||||||
integer d = UInt(Rd); integer n = UInt(Rn); if immh == '0000' then SEE(asimdimm); if immh<3>:Q == '10' then UNDEFINED; integer esize = 8 << HighestSetBit(immh); integer datasize = if Q == '1' then 128 else 64; integer elements = datasize DIV esize; integer shift = (esize * 2) - UInt(immh:immb);
| <V> |
Is a width specifier,
encoded in
|
| <d> |
Is the number of the SIMD&FP destination register, in the "Rd" field. |
| <n> |
Is the number of the first SIMD&FP source register, encoded in the "Rn" field. |
| <Vd> |
Is the name of the SIMD&FP destination register, encoded in the "Rd" field. |
| <T> |
Is an arrangement specifier,
encoded in
|
| <Vn> |
Is the name of the SIMD&FP source register, encoded in the "Rn" field. |
| <shift> |
For the scalar variant: is the right shift amount, in the range 1 to 64,
encoded in
| ||||||||||||
|
For the vector variant: is the right shift amount, in the range 1 to the element width in bits,
encoded in
|
CheckFPAdvSIMDEnabled64(); bits(datasize) operand = V[n]; bits(datasize) operand2 = V[d]; bits(datasize) result; bits(esize) mask = LSR(Ones(esize), shift); bits(esize) shifted; for e = 0 to elements-1 shifted = LSR(Elem[operand, e, esize], shift); Elem[result, e, esize] = (Elem[operand2, e, esize] AND NOT(mask)) OR shifted; V[d] = result;
If PSTATE.DIT is 1:
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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