ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Instruction Details
A8.6.337 VMUL, VMULL (integer and polynomial)
Vector Multiply multiplies corresponding elements in two vectors. Vector Multiply Long does the same
thing, but with destination vector elements that are twice as long as the elements that are multiplied.
For information about multiplying polynomials see Polynomial arithmetic over {0,1} on page A2-67.
Encoding T1 / A1 Advanced SIMD
VMUL. , ,
VMUL. , ,
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 op 1 1 1 1 0 D size Vn Vd 1 0 0 1 N Q M 1 Vm
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 1 1 1 0 0 1 op 0 D size Vn Vd 1 0 0 1 N Q M 1 Vm
if size == ‘11’ || (op == ‘1’ && size != ‘00’) then UNDEFINED;
if Q == ‘1’ && (Vd == ‘1’ || Vn == ‘1’ || Vm == ‘1’) then UNDEFINED;
polynomial = (op == ‘1’); long_destination = FALSE;
unsigned = FALSE; // “Don’t care” value: TRUE produces same functionality
esize = 8