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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonint16x8_tvsubl_high_s8(int8x16_t a, int8x16_t b)Vector arithmetic / Subtract / Widening subtraction
Description
Signed Subtract Long. This instruction subtracts each vector element in the lower or upper half of the second source SIMD&FP register from the corresponding vector element of the first source SIMD&FP register, places the results into a vector, and writes the vector to the destination SIMD&FP register. All the values in this instruction are signed integer values. The destination vector elements are twice as long as the source vector elements.
Results
Vd.8H result
This intrinsic compiles to the following instructions:

SSUBL2 Vd.8H,Vn.16B,Vm.16B

Argument Preparation
a register: Vn.16Bb register: Vm.16B
Architectures
A64

Operation

CheckFPAdvSIMDEnabled64();
bits(datasize)   operand1 = Vpart[n, part];
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, 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;