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PMAXSW

PMAXSW compares two signed 16-bit integers and returns the maximum value. It operates on packed 16-bit signed integers.

The following table covers what the source and destinations can be:

DO NOT support LOCK

This instruction is only available when the processor is in 64-bit mode or compatibility mode. It requires SSE4.1 support.

The instruction operates on packed signed 16-bit integers; using this instruction on unsigned data will result in incorrect maximum value selection due to the sign bit interpretation. Ensure that the XMM/YMM/ZMM registers are correctly aligned to the operand size to avoid performance penalties.