haddpd

Horizontal Add Packed Double-Precision

HADDPD xmm1, xmm2/m128

Adds adjacent double-precision elements horizontally.

Details

The Horizontal Add Packed Double-Precision instruction adds adjacent double-precision elements horizontally.

Pseudocode Operation

// Adds adjacent double-precision elements horizontally

Example

HADDPD xmm1, xmm2/m128

Encoding

Binary Layout
66
+0
0F
+1
7C
+2
 
Format SSE3
Opcode 66 0F 7C
Extension SSE3

Operands

  • dest
    128-bit XMM SIMD register
  • src
    128-bit XMM SIMD register or Memory operand