Experiment on zig compile-time checks (Conditional code in debug mode)

comptime-check.zig

// Results from `https://godbolt.org/` with Zig 0.12.0 compiler.

const std = @import("std");
const builtin = @import("builtin");

// Check happens at comptime
export fn t1() void {
    comptime var dbg: bool = false;
    dbg = builtin.mode != std.builtin.Mode.Debug;
    if (dbg) {
        std.debug.print("Test", .{});
    }
}

// t1:
//         push    rbp
//         mov     rbp, rsp
//         pop     rbp
//         ret

// Check happens at runtime
export fn t2() void {
    const dbg = builtin.mode != std.builtin.Mode.Debug;
    if (dbg) {
        std.debug.print("Test", .{});
    }
}

// t2:
//         push    rbp
//         mov     rbp, rsp
//         sub     rsp, 1
//         mov     byte ptr [rbp - 1], 0
//         add     rsp, 1
//         pop     rbp
//         ret