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ARM Compiler armasm User Guide : USHLL, USHLL2 (vector)

USHLL, USHLL2 (vector)

Unsigned shift left long (immediate).

This instruction is used by the alias UXTL, UXTL2, UXTL, UXTL22.

Syntax

USHLL{2} Vd.Ta, Vn.Tb, #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.

Ta

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.

Tb

Is an arrangement specifier, and can be one of the values shown in Usage.

shift

Is the left shift amount, in the range 0 to the source element width in bits minus 1, and can be one of the values shown in Usage.

Usage

The following table shows the valid specifier combinations:

Table 20-110 USHLL, USHLL2 (Vector) specifier combinations

Q Ta Tb shift
- 8H 8B to 7
2 8H 16B 0 to 7
- 4S 4H 0 to 15
2 4S 8H 0 to 15
- 2D 2S 0 to 31
2 2D 4S 0 to 31
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