Get top 32 bits of 64 bit value (I32) or top 16 bits of 32 bit value (I16) or top 64 bits of 128 bit value (I64). OPmsw
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Get top 32 bits of 64 bit value (I32) or top 16 bits of 32 bit value (I16) or top 64 bits of 128 bit value (I64). OPmsw