zig/lib/std/math/nan.zig

const math = @import("../math.zig");

/// Returns the nan representation for type T.
pub fn nan(comptime T: type) T {
    return switch (T) {
        f16 => math.nan_f16,
        f32 => math.nan_f32,
        f64 => math.nan_f64,
        f80 => math.nan_f80,
        f128 => math.nan_f128,
        else => @compileError("nan not implemented for " ++ @typeName(T)),
    };
}

/// Returns the signalling nan representation for type T.
pub fn snan(comptime T: type) T {
    // Note: A signalling nan is identical to a standard right now by may have a different bit
    // representation in the future when required.
    return switch (T) {
        f16 => @bitCast(f16, math.nan_u16),
        f32 => @bitCast(f32, math.nan_u32),
        f64 => @bitCast(f64, math.nan_u64),
        f80 => @bitCast(f80, math.nan_u80),
        f128 => @bitCast(f128, math.nan_u128),
        else => @compileError("snan not implemented for " ++ @typeName(T)),
    };
}