Zig 0.17.0-dev (Split by item)

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clzXi2

count0bits.clzXi2

inline fn clzXi2(comptime T: type, a: T) i32

File

lib/compiler_rt/count0bits.zig:30

Code

inline fn clzXi2(comptime T: type, a: T) i32 {
    var x = switch (@bitSizeOf(T)) {
        32 => @as(u32, @bitCast(a)),
        64 => @as(u64, @bitCast(a)),
        128 => @as(u128, @bitCast(a)),
        else => unreachable,
    };
    var n: T = @bitSizeOf(T);
    // Count first bit set using binary search, from Hacker's Delight
    var y: @TypeOf(x) = 0;
    comptime var shift: u8 = @bitSizeOf(T);
    inline while (shift > 0) {
        shift = shift >> 1;
        y = x >> shift;
        if (y != 0) {
            n = n - shift;
            x = y;
        }
    }
    return @intCast(n - @as(T, @bitCast(x)));
}