SQRSHR (two registers)

Multi-vector signed saturating rounding shift right narrow by immediate

Shift right by an immediate value, the signed integer value in each element of the two source vectors and place the rounded results in the half-width destination elements. Each result element is saturated to the half-width N-bit element's signed integer range -2(N-1) to (2(N-1))-1. The immediate shift amount is an unsigned value in the range 1 to 16.

This instruction is unpredicated.

SME2
(FEAT_SME2)

313029282726252423222120191817161514131211109876543210
110000011110imm4110101Zn0Zd
U

SQRSHR <Zd>.H, { <Zn1>.S-<Zn2>.S }, #<const>

if !IsFeatureImplemented(FEAT_SME2) then UNDEFINED; constant integer esize = 16; constant integer n = UInt(Zn:'0'); constant integer d = UInt(Zd); constant integer shift = esize - UInt(imm4);

Assembler Symbols

<Zd>

Is the name of the destination scalable vector register, encoded in the "Zd" field.

<Zn1>

Is the name of the first scalable vector register of the source multi-vector group, encoded as "Zn" times 2.

<Zn2>

Is the name of the second scalable vector register of the source multi-vector group, encoded as "Zn" times 2 plus 1.

<const>

Is the immediate shift amount, in the range 1 to 16, encoded in the "imm4" field.

Operation

CheckStreamingSVEEnabled(); constant integer VL = CurrentVL; constant integer elements = VL DIV (2 * esize); bits(VL) result; for r = 0 to 1 constant bits(VL) operand = Z[n+r, VL]; for e = 0 to elements-1 constant bits(2 * esize) element = Elem[operand, e, 2 * esize]; constant integer res = (SInt(element) + (1 << (shift-1))) >> shift; Elem[result, r*elements + e, esize] = SignedSat(res, esize); Z[d, VL] = result;


Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45

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