fsave

Save FPU State

FSAVE m108byte

Stores FPU state to memory and re-initializes FPU.

Details

The Save FPU State instruction stores FPU state to memory and re-initializes FPU.

Pseudocode Operation

// Stores FPU state to memory and re-initializes FPU

Example

FSAVE m108byte

Encoding

Binary Layout
9B
+0
DD
+1
ModRM
+2
 
Format Legacy
Opcode 9B DD /6
Extension x87 FPU

Operands

  • dest
    Memory