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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonint64_tvsubd_s64(int64_t a, int64_t b)Vector arithmetic / Subtract / Subtraction
Description
Subtract (vector). This instruction subtracts each vector element in the second source SIMD&FP register from the corresponding vector element in the first source SIMD&FP register, places the result into a vector, and writes the vector to the destination SIMD&FP register.
Results
Dd result
This intrinsic compiles to the following instructions:

SUB Dd,Dn,Dm

Argument Preparation
a register: Dnb register: Dm
Architectures
A64

Operation

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

for e = 0 to elements-1
    element1 = Elem[operand1, e, esize];
    element2 = Elem[operand2, e, esize];
    if sub_op then
        Elem[result, e, esize] = element1 - element2;
    else
        Elem[result, e, esize] = element1 + element2;

V[d] = result;