fsub

Subtract Floating Point

FSUB m32fp/m64fp

Subtracts src from dest.

Details

The Subtract Floating Point instruction subtracts src from dest.

Pseudocode Operation

ST(0) <- ST(0) - SRC

Example

FSUB m32fp/m64fp

Encoding

Binary Layout
D8
+0
ModRM
+1
 
Format Legacy
Opcode D8 /4
Extension x87 FPU

Operands

  • src
    Memory/Reg