| Parameter | Description |
|---|---|
| a0 | 64-bit vector a0 |
| a1 | 128-bit vector a1 |
| a2 | Lane index to a1. Must be an immediate in the range of [0..3] |
v128 128-bit vector
Unsigned Multiply Long (vector, by element). This instruction multiplies each vector element in the lower or upper half of the first source SIMD&FP register by the specified vector element of the second source SIMD&FP register, places the results in a vector, and writes the vector to the destination SIMD&FP register. The destination vector elements are twice as long as the elements that are multiplied.The UMULL instruction extracts vector elements from the lower half of the first source register, while the UMULL2 instruction extracts vector elements from the upper half of the first source register.Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
Equivalent instruction: UMULL Vd.2D,Vn.2S,Vm.S[lane]