Mandelbrot example: double precision

[t0b3]

add double precision for

• maxiter: ushort(16) -> uint(32)
• output: ushort(16) -> uint(32)
• z, q: complex64 -> complex128
• real, nreal, imag: float -> double

works fine here

[inducer]

Could you explain what the presumed benefit is? An immediate downside is that devices without high-performance double support (Nvidia...) will suffer a decrease in performance. As a result, maybe this should be an option?

[t0b3]

intend is to

• extend the demo and explain how high precision can be implemented
• enable this very example to dive into much lower zoom levels
  code works fine here on budget radeon

[t0b3]

performance doesn't decrease compared to 32bit
fyi this 64bit code performs fluent on 64bit cpus like

• 5$ entry level cloud vm cpu
• raspi4 cpu