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

## FRINTI (vector)

Floating-point Round to Integral, using current rounding mode (vector). This instruction rounds a vector of floating-point values in the SIMD&FP source register to integral floating-point values of the same size using the rounding mode that is determined by the FPCR, and writes the result to the SIMD&FP destination register.

A zero input gives a zero result with the same sign, an infinite input gives an infinite result with the same sign, and a NaN is propagated as for normal arithmetic.

A floating-point exception can be generated by this instruction. Depending on the settings in FPCR, the exception results in either a flag being set in FPSR, or a synchronous exception being generated. For more information, see Floating-point exception traps.

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: Half-precision and Single-precision and double-precision

### Half-precision
(FEAT_FP16)

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 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | Rn | Rd
|  | U |  | o2 |  |  | o1 |  |  |

####

FRINTI <Vd>.<T>, <Vn>.<T>

if !IsFeatureImplemented(FEAT_FP16) then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); constant integer esize = 16; constant integer datasize = 64 << UInt(Q); integer elements = datasize DIV esize; boolean exact = FALSE; FPRounding rounding; case U:o1:o2 of when '0xx' rounding = FPDecodeRounding(o1:o2); when '100' rounding = FPRounding_TIEAWAY; when '101' UNDEFINED; when '110' rounding = FPRoundingMode(FPCR); exact = TRUE; when '111' rounding = FPRoundingMode(FPCR);

### Single-precision and double-precision

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 | 0 | 1 | sz | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | Rn | Rd
|  | U |  | o2 |  |  |  | o1 |  |  |

####

FRINTI <Vd>.<T>, <Vn>.<T>

integer d = UInt(Rd); integer n = UInt(Rn); if sz:Q == '10' then UNDEFINED; constant integer esize = 32 << UInt(sz); constant integer datasize = 64 << UInt(Q); integer elements = datasize DIV esize; boolean exact = FALSE; FPRounding rounding; case U:o1:o2 of when '0xx' rounding = FPDecodeRounding(o1:o2); when '100' rounding = FPRounding_TIEAWAY; when '101' UNDEFINED; when '110' rounding = FPRoundingMode(FPCR); exact = TRUE; when '111' rounding = FPRoundingMode(FPCR);

### Assembler Symbols

<Vd> | Is the name of the SIMD&FP destination register, encoded in the "Rd" field.

<T> | For the half-precision variant: is an arrangement specifier, encoded in Q:
Q | <T>
--- | ---
0 | 4H
1 | 8H
| For the single-precision and double-precision variant: is an arrangement specifier, encoded in sz:Q:
sz | Q | <T>
--- | --- | ---
0 | 0 | 2S
0 | 1 | 4S
1 | 0 | RESERVED
1 | 1 | 2D

<Vn> | Is the name of the SIMD&FP source register, encoded in the "Rn" field.

### Operation

CheckFPAdvSIMDEnabled64(); bits(datasize) operand = V[n, datasize]; bits(datasize) result; bits(esize) element; for e = 0 to elements-1 element = Elem[operand, e, esize]; Elem[result, e, esize] = FPRoundInt(element, FPCR, rounding, exact); V[d, datasize] = result;

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

Internal version only: isa v33.74, AdvSIMD v29.23, pseudocode v2023-09_rel, sve v2023-09_rc3 ; Build timestamp: 2023-09-27T17:06

Copyright © 2010-2023 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.