18.46 FSQRT (scalar)

Floating-point Square Root (scalar).

Syntax

FSQRT Hd, Hn ; Half-precision

FSQRT Sd, Sn ; Single-precision

FSQRT Dd, Dn ; Double-precision

Where:

Hd
Is the 16-bit name of the SIMD and FP destination register.
Hn
Is the 16-bit name of the SIMD and FP source register.
Sd
Is the 32-bit name of the SIMD and FP destination register.
Sn
Is the 32-bit name of the SIMD and FP source register.
Dd
Is the 64-bit name of the SIMD and FP destination register.
Dn
Is the 64-bit name of the SIMD and FP source register.

Operation

Floating-point Square Root (scalar). This instruction calculates the square root of the value in the SIMD and FP source register and writes the result to the SIMD and FP destination register.

A floating-point exception can be generated by this instruction. 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 ARMv8, for ARMv8-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.

Vd = sqrt(Vn).

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