blsfill

Bit Line Set Fill

BLSFILL r32, r/m32

Sets all bits below lowest set bit ((x-1) | x).

Details

The Bit Line Set Fill instruction sets all bits below lowest set bit ((x-1) | x).

Pseudocode Operation

// Sets all bits below lowest set bit ((x-1) | x)

Example

BLSFILL eax, ebx

Encoding

Binary Layout
VEX
+0
opcode
+3
ModRM
+4
 
Format TBM
Opcode 8F ... 04
Extension TBM

Operands

  • dest
    32-bit general-purpose register (e.g. EAX)
  • src
    32-bit register or memory