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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonuint16x8_tvsubw_u8(uint16x8_t a, uint8x8_t b)Vector arithmetic / Subtract / Widening subtraction
Description
Unsigned Subtract Wide. This instruction subtracts each vector element of the second source SIMD&FP register from the corresponding vector element in the lower or upper half of the first source SIMD&FP register, places the result in a vector, and writes the vector to the SIMD&FP destination register. All the values in this instruction are signed integer values.
Results
Vd.8H result
This intrinsic compiles to the following instructions:

USUBW Vd.8H,Vn.8H,Vm.8B

Argument Preparation
a register: Vn.8Hb register: Vm.8B
Architectures
v7, A32, A64

Operation

CheckFPAdvSIMDEnabled64();
bits(2*datasize) operand1 = V[n];
bits(datasize)   operand2 = Vpart[m, part];
bits(2*datasize) result;
integer element1;
integer element2;
integer sum;

for e = 0 to elements-1
    element1 = Int(Elem[operand1, e, 2*esize], unsigned);
    element2 = Int(Elem[operand2, e, esize], unsigned);
    if sub_op then
        sum = element1 - element2;
    else
        sum = element1 + element2;
    Elem[result, e, 2*esize] = sum<2*esize-1:0>;

V[d] = result;