Floating-point Reciprocal Square Root Estimate.
Hn ; Scalar half precision
n ; Scalar single-precision and double-precision
- Is the 16-bit name of the SIMD and FP destination register.
- Is the 16-bit name of the SIMD and FP source register.
Is a width specifier, and can be either
- Is the number of the SIMD and FP destination register.
- Is the number of the SIMD and FP source register.
Architectures supported (scalar)
Supported in ARMv8.2 and later.
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 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.