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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonfloat64x1_tvsub_f64(float64x1_t a, float64x1_t b)Vector arithmetic / Subtract / Subtraction
Description
Floating-point Subtract (vector). 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, places each result into elements of a vector, and writes the vector to the destination SIMD&FP register.
Results
Dd result
This intrinsic compiles to the following instructions:

FSUB 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(esize) element1;
bits(esize) element2;
bits(esize) diff;
FPCRType fpcr = FPCR[];
bits(datasize) result;

for e = 0 to elements-1
    element1 = Elem[operand1, e, esize];
    element2 = Elem[operand2, e, esize];
    diff = FPSub(element1, element2, fpcr);
    Elem[result, e, esize] = if abs then FPAbs(diff) else diff;

V[d] = result;