Intel ARCHITECTURE IA-32 Reference Manual page 282

IA-32 Intel® Architecture Optimization
Example 5-9 Horizontal Add Using movhlps/movlhps (continued)
// START HORIZONTAL ADD
movaps xmm5, xmm0
movlhps xmm5, xmm1
movhlps xmm1, xmm0
addps xmm5, xmm1
movaps xmm4, xmm2
movlhps xmm2, xmm3
movhlps xmm3, xmm4
addps xmm3, xmm2
movaps xmm6, xmm3
shufps xmm3, xmm5, 0xDD
shufps xmm5, xmm6, 0x88
addps xmm6, xmm5
// END HORIZONTAL ADD
movaps [edx], xmm6
}
}
5-20
// xmm5= A1,A2,A3,A4
// xmm5= A1,A2,B1,B2
// xmm1= A3,A4,B3,B4
// xmm5= A1+A3,A2+A4,B1+B3,B2+B4
// xmm2= C1,C2,D1,D2
// xmm3= C3,C4,D3,D4
// xmm3= C1+C3,C2+C4,D1+D3,D2+D4
// xmm6= C1+C3,C2+C4,D1+D3,D2+D4
//xmm6=A1+A3,B1+B3,C1+C3,D1+D3
// xmm5= A2+A4,B2+B4,C2+C4,D2+D4
// xmm6= D,C,B,A