fn mandelbrot_escape(cr: Float64x4, ci: Float64x4, max_iters: u32) -> Uint64x4 {
let two = Float64x4::splat(2.0);
let four = Float64x4::splat(4.0);
let one = Uint64x4::splat(1);
let mut zr = cr;
let mut zi = ci;
let mut count = Uint64x4::zero();
let mut alive_mask = Uint64x4::zero();
for _ in 0..max_iters {
let rsqr = zr * zr;
let isqr = zi * zi;
let alive_mask_f = (rsqr + isqr).lt(four);
if alive_mask_f.mask() == 0 {
return count;
}
alive_mask = alive_mask_f.transmute();
count += one & alive_mask;
// zi = ci + two * zr * zi;
zi = two.fmadd(zr * zi, ci);
zr = cr + rsqr - isqr;
}
// count & ~alive_mask
alive_mask.andnot(count)
}
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