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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonint16x8_tvhsubq_s16(int16x8_t a, int16x8_t b)Vector arithmetic / Subtract / Narrowing subtraction
Description
Signed Halving Subtract. This instruction subtracts the elements in the vector in the second source SIMD&FP register from the corresponding elements in the vector in the first source SIMD&FP register, shifts each result right one bit, places each result into elements of a vector, and writes the vector to the destination SIMD&FP register.
Results
Vd.8H result
This intrinsic compiles to the following instructions:

SHSUB Vd.8H,Vn.8H,Vm.8H

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

Operation

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

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

V[d] = result;