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SIMD ISAReturn TypeNameArgumentsInstruction Group
Neonfloat64x2_tvrsqrteq_f64(float64x2_t a)Vector arithmetic / Reciprocal / Reciprocal square-root estimate
Description
Floating-point Reciprocal Square Root Estimate. This instruction calculates an approximate square root for each vector element in the source SIMD&FP register, places the result in a vector, and writes the vector to the destination SIMD&FP register.
Results
Vd.2D result
This intrinsic compiles to the following instructions:

FRSQRTE Vd.2D,Vn.2D

Argument Preparation
a register: Vn.2D
Architectures
A64

Operation

CheckFPAdvSIMDEnabled64();
bits(datasize) operand = V[n];

bits(esize) element;
FPCRType fpcr    = FPCR[];
boolean merge    = elements == 1 && IsMerging(fpcr);
bits(128) result = if merge then V[d] else Zeros();

for e = 0 to elements-1
    element = Elem[operand, e, esize];
    Elem[result, e, esize] = FPRSqrtEstimate(element, fpcr);

V[d] = result;