Population Count per byte.
- Is the name of the SIMD and FP destination register.
Is an arrangement specifier, and can be either
- Is the name of the SIMD and FP source register.
Population Count per byte. This instruction counts the number of bits that have a value of one in each vector element in the source SIMD and FP register, places the result into a vector, and writes the vector to the destination SIMD and FP register.
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.