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FXTRACT

Extracts a specified number of bits from a floating-point value and stores the result as an integer in a destination operand.

The table below covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available only in compatibility mode. It operates exclusively on the ST(0) register of the x87 FPU stack.

The destination MUST be a 32-bit register or memory location. If the extracted value exceeds the capacity of a dword, the behavior is undefined. The bit-field specification is provided via an immediate value or a register, defining the starting bit position and the length of the field to be extracted.