vrintn

Vector Round Floating-Point (Nearest Even)

VRINTN<c>.F32 <Qd>, <Qm>

Rounds float to integral float (Nearest Even).

Pseudocode Operation

for i = 0 to 3
  Qd[i] ← RoundToNearestEven(Qm[i])
end for

Example

VRINTN.F32 q0, q2

Encoding

Binary Layout

111111101

31:23

D

22

111

21:19

0

18

01

17:16

Vd

15:12

10

11:10

10

9:8

0

7

1

6

M

5

0

4

Vm

3:0

 

Format NEON 2-Reg

Opcode 0xFEB90A40

Extension NEON (SIMD)

Operands

• Qd
  Destination 128-bit SIMD register
• Qm
  Second source 128-bit SIMD register

Related

More in NEON (SIMD)

Reference

View in Arm A64 ISA Reference ↗ Arm AArch32 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xF3B20400	VRINTN{<q>}.<dt> <Dd>, <Dm>		A32		111100111 | D | 11 | size | 10 | Vd | 0 | 1 | 000 | 0 | M | 0 | Vm
0xF3B20440	VRINTN{<q>}.<dt> <Qd>, <Qm>		A32		111100111 | D | 11 | size | 10 | Vd | 0 | 1 | 000 | 1 | M | 0 | Vm
0xFFB20400	VRINTN{<q>}.<dt> <Dd>, <Dm>		T32		111111111 | D | 11 | size | 10 | Vd | 0 | 1 | 000 | 0 | M | 0 | Vm
0xFFB20440	VRINTN{<q>}.<dt> <Qd>, <Qm>		T32		111111111 | D | 11 | size | 10 | Vd | 0 | 1 | 000 | 1 | M | 0 | Vm
0xFEB90940	VRINTN{<q>}.F16 <Sd>, <Sm>		A32		111111101 | D | 111 | 0 | 01 | Vd | 10 | 01 | 0 | 1 | M | 0 | Vm
0xFEB90A40	VRINTN{<q>}.F32 <Sd>, <Sm>		A32		111111101 | D | 111 | 0 | 01 | Vd | 10 | 10 | 0 | 1 | M | 0 | Vm
0xFEB90B40	VRINTN{<q>}.F64 <Dd>, <Dm>		A32		111111101 | D | 111 | 0 | 01 | Vd | 10 | 11 | 0 | 1 | M | 0 | Vm

Description

Round floating-point to integer to Nearest rounds a floating-point value to an integral floating-point value of the same size using the Round to Nearest rounding mode. 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.

Operation

EncodingSpecificOperations(); CheckVFPEnabled(TRUE);
case esize of
    when 16
        S[d] = Zeros(16) : FPRoundInt(S[m]<15:0>, FPSCR[], rounding, exact);
    when 32
        S[d] = FPRoundInt(S[m], FPSCR[], rounding, exact);
    when 64
        D[d] = FPRoundInt(D[m], FPSCR[], rounding, exact);