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STD

Stores the current floating-point precision control word into the specified memory location.

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

DO NOT support LOCK

The STD instruction is only available in 32-bit protected mode and compatibility mode. It is not supported in 64-bit mode.

The destination memory operand MUST be a word (2 bytes). Attempting to use a different operand size will result in an invalid operation. This instruction affects only the x87 FPU state and does not impact general-purpose registers.