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VRCP14PD

Computes an approximate reciprocal of packed double-precision floating-point values. The instruction computes $1/x$ with a relative error of at most $2^{-14}$ for each double-precision element in the source.

The following table describes the supported source and destination operands.

DO NOT support LOCK

This instruction is available only in 64-bit mode or 32-bit mode when the AVX-512 foundation is supported. It requires the EVEX prefix for zmm registers.

The result is an approximation; therefore, it SHALL be used as an initial guess for iterative refinement (e.g., Newton-Raphson) if higher precision is required. The instruction does not trigger floating-point exceptions except for #P if the result is inexact. It does not support the lock prefix.