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ARM Compiler armasm User Guide : UQSHRN, UQSHRN2 (vector)

UQSHRN, UQSHRN2 (vector)

Unsigned saturating shift right narrow (immediate).

Syntax

UQSHRN{2} Vd.Tb, Vn.Ta, #shift

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.

shift

Is the right shift amount, in the range 1 to the destination element width in bits, and can be one of the values shown in Usage.

Usage

The following table shows the valid specifier combinations:

Table 20-106 UQSHRN{2} (Vector) specifier combinations

Q Tb Ta shift
- 8B 8H to 8
2 16B 8H 1 to 8
- 4H 4S 1 to 16
2 8H 4S 1 to 16
- 2S 2D 1 to 32
2 4S 2D 1 to 32
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