Arm Compiler armasm User Guide : 20.95 FRSQRTE (vector)

20.95 FRSQRTE (vector)

Floating-point Reciprocal Square Root Estimate.

Syntax

FRSQRTE Vd.T, Vn.T ; Vector half precision

FRSQRTE Vd.T, Vn.T ; Vector single-precision and double-precision

Where:

Vd

Is the name of the SIMD and FP destination register

T

Is an arrangement specifier:

Vector half precision: Can be one of 4H or 8H.
Vector single-precision and double-precision: Can be one of 2S, 4S or 2D.

Vn

Is the name of the SIMD and FP source register

Architectures supported (vector)

Supported in the Arm^®v8.2 architecture and later.

Usage

Floating-point Reciprocal Square Root Estimate. This instruction calculates an approximate square root for each vector element in the source SIMD and FP register, places the result in a vector, and writes the vector to the destination SIMD and FP register.

This instruction can generate a floating-point exception. Depending on the settings in FPCR, the exception results in either a flag being set in FPSR or a synchronous exception being generated. For more information, see Floating-point exception traps in the Arm^® Architecture Reference Manual Arm^®v8, for Arm^®v8‑A architecture profile.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Related references

20.1 A64 SIMD Vector instructions in alphabetical order

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