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RCPSS

Rounds the scalar single-precision floating-point value in the source operand to the nearest specified rounding mode and stores the result in the destination operand.

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

DO NOT support LOCK

The instruction SHALL only be executed in 64-bit mode or compatibility mode. It requires SSE3 support.

The rounding mode is determined by the rounding control field in the MXCSR register. If the destination operand is the same as the source operand, the value is rounded in-place. Failure to properly configure the MXCSR register prior to execution will result in rounding behavior inconsistent with the intended precision.