11.178 USAT16

Parallel halfword Saturate.

Syntax

USAT16{cond} Rd, #sat, Rn

where:

cond

is an optional condition code.

Rd

is the destination register.

sat

specifies the bit position to saturate to, in the range 0 to 15.

Rn

is the register holding the operand.

Operation

Halfword-wise unsigned saturation to any bit position.

The USAT16 instruction saturates each signed halfword to the unsigned range 0 ≤ x ≤ 2sat –1.

Register restrictions

You cannot use PC for any register.

You can use SP in ARM instructions but this is deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.

Q flag

If saturation occurs on either halfword, this instruction sets the Q flag. To read the state of the Q flag, use an MRS instruction.

Architectures

This ARM instruction is available in ARMv6 and above.

This 32-bit Thumb instruction is available in ARMv6T2 and above. For the ARMv7-M architecture, it is only available in an ARMv7E-M implementation.

There is no 16-bit version of this instruction in Thumb.

Example

    USAT16  r0, #7, r5
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