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POPF

Pops the top word from the stack and loads it into the RFLAGS register.

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

DO NOT support LOCK

This instruction is available in 64-bit mode, but it operates on a word (16-bit) value from the stack. Only the low 16 bits of the popped value are used to update the RFLAGS register.

The instruction only modifies the lower 16 bits of RFLAGS; the upper 48 bits remain unchanged. In 64-bit mode, the stack pointer (RSP) is incremented by 2 bytes after the operation. Programmers MUST ensure the stack is properly aligned to avoid potential faults when accessing memory.