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FRNDINT

Rounds the ST(0) floating-point value to the nearest integer, rounding to the nearest even number in the case of a tie. The result is stored in ST(0).

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available in both 32-bit and 64-bit mode. It operates exclusively on the x87 floating-point unit (FPU) register stack.

The instruction SHALL trigger #O if the rounded result cannot be represented within the destination precision. If the input is a NaN, #I is signaled. If the result is not exact, #P is signaled. User MUST ensure that the FPU control word is configured correctly for the desired rounding precision, as this instruction follows the rounding mode specified in the x87 control word.