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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonint8x8_tvhadd_s8(int8x8_t a, int8x8_t b)Vector arithmetic / Add / Narrowing addition
Description
Signed Halving Add. This instruction adds corresponding signed integer values from the two source SIMD&FP registers, shifts each result right one bit, places the results into a vector, and writes the vector to the destination SIMD&FP register.
Results
Vd.8B result
This intrinsic compiles to the following instructions:

SHADD Vd.8B,Vn.8B,Vm.8B

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

Operation

CheckFPAdvSIMDEnabled64();
bits(datasize) operand1 = V[n];
bits(datasize) operand2 = V[m];
bits(datasize) result;
integer element1;
integer element2;
integer sum;

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

V[d] = result;