SQSHRUN, SQSHRUN2
Signed saturating Shift Right Unsigned Narrow (immediate). This instruction reads each signed integer value in the vector of the source SIMD&FP register, right shifts each value by an immediate value, saturates the result to an unsigned integer value that is half the original width, places the final result into a vector, and writes the vector to the destination SIMD&FP register. The results are truncated. For rounded results, see SQRSHRUN.
The SQSHRUN instruction writes the vector to the lower half of the destination register and clears the upper half, while the SQSHRUN2 instruction writes the vector to the upper half of the destination register without affecting the other bits of the register.
If saturation occurs, the cumulative saturation bit FPSR.QC is set.
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 | 1 | 0 | 0 | 0 | 0 | 1 | Rn | Rd |
| | | immh | | | op | | | |
integer d = UInt(Rd);
integer n = UInt(Rn);
if immh == '0000' then ReservedValue();
if immh<3> == '1' then ReservedValue();
integer esize = 8 << HighestSetBit(immh);
integer datasize = esize;
integer elements = 1;
integer part = 0;
integer shift = (2 * esize) - UInt(immh:immb);
boolean round = (op == '1');
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 | 1 | 0 | 0 | 0 | 0 | 1 | Rn | Rd |
| | | | immh | | | op | | | |
integer d = UInt(Rd);
integer n = UInt(Rn);
if immh == '0000' then SEE(asimdimm);
if immh<3> == '1' then ReservedValue();
integer esize = 8 << HighestSetBit(immh);
integer datasize = 64;
integer part = UInt(Q);
integer elements = datasize DIV esize;
integer shift = (2 * esize) - UInt(immh:immb);
boolean round = (op == '1');
Assembler Symbols
Operation
CheckFPAdvSIMDEnabled64();
bits(datasize*2) operand = V[n];
bits(datasize) result;
integer round_const = if round then (1 << (shift - 1)) else 0;
integer element;
boolean sat;
for e = 0 to elements-1
element = (SInt(Elem[operand, e, 2*esize]) + round_const) >> shift;
(Elem[result, e, esize], sat) = UnsignedSatQ(element, esize);
if sat then FPSR.QC = '1';
Vpart[d, part] = result;
Internal version only: isa v25.07, AdvSIMD v23.0, pseudocode v31.3
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