Zig implementation of a fast floating point to string conversion algorithm
Inspirations:
- Victor Zverovich's C/C++ implementation - Reference Implementation
- David Tolnay's Rust implementation
const zmij = @import("zmij.zig");
const expectEqualStrings = @import("std").testing.expectEqualStrings;
pub fn main() !void {
var buf = zmij.Buffer{};
const printed = buf.format(1.234);
try expectEqualStrings("1.234e+00", printed);
}The code has been benchmarked against std.fmt and the results are as follows:
| Value(std.fmt) | Avg. Time (ns) | Value(zmij) | Avg. Time (ns) |
|---|---|---|---|
| 1.23456e2 | 46.477042 | 1.23456e2 | 15.358958 |
| 3.141592653589793e0 | 23.618917 | 3.141592653589793e0 | 18.435417 |
| 1e-20 | 53.539584 | 1e-20 | 14.902084 |
| 1.2345678901234567e300 | 24.850875 | 1.2345678901234567e300 | 18.55775 |
| 0e0 | 14.432 | 0e0 | 0.910042 |
To run it on your own machine, use:
zig build bench -Doptimize=ReleaseFast