fstcw

Store Control Word

FSTCW m2byte

Stores FPU control word to memory.

Details

The Store Control Word instruction stores FPU control word to memory.

Pseudocode Operation

// Stores FPU control word to memory

Example

FSTCW m2byte

Encoding

Binary Layout
9B
+0
D9
+1
ModRM
+2
 
Format Legacy
Opcode 9B D9 /7
Extension x87 FPU

Operands

  • dest
    Memory