Zig 0.17.0-dev (Split by item)

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hypotUnfused

hypot.hypotUnfused

inline fn hypotUnfused(comptime F: type, x: F, y: F) F

File

lib/std/math/hypot.zig:72

Code

inline fn hypotUnfused(comptime F: type, x: F, y: F) F {
    const r = @sqrt(x * x + y * y);
    if (r <= 2 * y) { // 30deg or steeper
        const dx = r - y;
        const z = x * (2 * dx - x) + (dx - 2 * (x - y)) * dx;
        return r - z / (2 * r);
    } else { // shallower than 30 deg
        const dy = r - x;
        const z = 2 * dy * (x - 2 * y) + (4 * dy - y) * y + dy * dy;
        return r - z / (2 * r);
    }
}