vcvtn

Vector Convert to Integer (Nearest Even)

VCVTN<c>.<dt>.F32 <Qd>, <Qm>

Converts float to integer, rounding to nearest even.

Pseudocode Operation

for i ← 0 to (128 / element_width) - 1 do; element ← Qm[i]; integer_result ← ConvertToInteger(element, RoundToNearestEven, unsigned); Qd[i] ← integer_result; end

Example

VCVTN.dt.F32 q0, q2

Encoding

Binary Layout

111111101

31:23

D

22

111

21:19

1

18

01

17:16

Vd

15:12

10

11:10

10

9:8

op

7

1

6

M

5

0

4

Vm

3:0

 

Format NEON 2-Reg

Opcode 0xFEBD0A40

Extension NEON (SIMD)

Operands

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

Related

Other forms of vcvtn

• vcvtn Vector Convert to Integer (Nearest Even, Double)

More in NEON (SIMD)

Reference

View in Arm A64 ISA Reference ↗ Arm AArch32 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xF3B30100	VCVTN{<q>}.<dt>.<dt2> <Dd>, <Dm>		A32		111100111 | D | 11 | size | 11 | Vd | 0 | 0 | 01 | op | 0 | M | 0 | Vm
0xF3B30140	VCVTN{<q>}.<dt>.<dt2> <Qd>, <Qm>		A32		111100111 | D | 11 | size | 11 | Vd | 0 | 0 | 01 | op | 1 | M | 0 | Vm
0xFFB30100	VCVTN{<q>}.<dt>.<dt2> <Dd>, <Dm>		T32		111111111 | D | 11 | size | 11 | Vd | 0 | 0 | 01 | op | 0 | M | 0 | Vm
0xFFB30140	VCVTN{<q>}.<dt>.<dt2> <Qd>, <Qm>		T32		111111111 | D | 11 | size | 11 | Vd | 0 | 0 | 01 | op | 1 | M | 0 | Vm
0xFEBD0940	VCVTN{<q>}.<dt>.F16 <Sd>, <Sm>		A32		111111101 | D | 111 | 1 | 01 | Vd | 10 | 01 | op | 1 | M | 0 | Vm
0xFEBD0A40	VCVTN{<q>}.<dt>.F32 <Sd>, <Sm>		A32		111111101 | D | 111 | 1 | 01 | Vd | 10 | 10 | op | 1 | M | 0 | Vm
0xFEBD0B40	VCVTN{<q>}.<dt>.F64 <Sd>, <Dm>		A32		111111101 | D | 111 | 1 | 01 | Vd | 10 | 11 | op | 1 | M | 0 | Vm

Description

Convert floating-point to integer with Round to Nearest converts a value in a register from floating-point to a 32-bit integer using the Round to Nearest rounding mode, and places the result in a second register. Depending on settings in the CPACR, NSACR, HCPTR, and FPEXC registers, and the Security state and PE mode in which the instruction is executed, an attempt to execute the instruction might be undefined, or trapped to Hyp mode. For more information see Enabling Advanced SIMD and floating-point support.

Operation

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