FEMMS
Usage: FEMMS src Modifies flags:
Faster Enter/Exit of the MMX or floating-point state
FEMMS ; 0F 0E [PENT,3DNOW]
FEMMS can be used in place of the EMMS instruction on processors which support the 3DNow! instruction set. Following execution of FEMMS, the state of the MMX/FP registers is undefined, and this allows a faster context switch between FP and MMX instructions. The FEMMS instruction can also be used executing MMX instructions
FPU Flags Affected
Example:
femms st4