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UQXTN, UQXTN2 (vector)

Unsigned saturating extract Narrow.

Syntax

UQXTN{2} Vd.Tb, Vn.Ta

Where:

2
Is the second and upper half specifier. If present it causes the operation to be performed on the upper 64 bits of the registers holding the narrower elements. See <Q> in the Usage table.
Vd
Is the name of the SIMD and FP destination register.
Tb
Is an arrangement specifier, and can be one of the values shown in Usage.
Vn
Is the name of the SIMD and FP source register.
Ta
Is an arrangement specifier, and can be one of the values shown in Usage.

Usage

Unsigned saturating extract Narrow. This instruction reads each vector element from the source SIMD and FP register, saturates each value to half the original width, places the result into a vector, and writes the vector to the destination SIMD and FP register. All the values in this instruction are unsigned integer values.

If saturation occurs, the cumulative saturation bit FPSR.QC is set.

The UQXTN instruction writes the vector to the lower half of the destination register and clears the upper half, while the UQXTN2 instruction writes the vector to the upper half of the destination register without affecting the other bits of the register.

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.

The following table shows the valid specifier combinations:

Table 20-105 UQXTN{2} (Vector) specifier combinations

<Q> Tb Ta
- 8B 8H
2 16B 8H
- 4H 4S
2 8H 4S
- 2S 2D
2 4S 2D
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