Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

## FRSQRTE

Floating-point reciprocal square root estimate (unpredicated)

Find the approximate reciprocal square root of each active floating-point element of the source vector, and place the results in the corresponding elements of the destination vector. This instruction is unpredicated.

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 | 0 | 0 | 1 | 0 | 1 | size | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | Zn | Zd

####

FRSQRTE <Zd>.<T>, <Zn>.<T>

if !HaveSVE() && !HaveSME() then UNDEFINED; if size == '00' then UNDEFINED; constant integer esize = 8 << UInt(size); integer n = UInt(Zn); integer d = UInt(Zd);

### Assembler Symbols

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

<T> | Is the size specifier, encoded in size:
size | <T>
--- | ---
00 | RESERVED
01 | H
10 | S
11 | D

<Zn> | Is the name of the source scalable vector register, encoded in the "Zn" field.

### Operation

CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; bits(VL) operand = Z[n, VL]; bits(VL) result; for e = 0 to elements-1 bits(esize) element = Elem[operand, e, esize]; Elem[result, e, esize] = FPRSqrtEstimate(element, FPCR[]); Z[d, VL] = result;

Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

Internal version only: isa v33.64, AdvSIMD v29.12, pseudocode v2023-06_rel, sve v2023-06_rel ; Build timestamp: 2023-07-04T19:42

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