Function snan [src]

Alias for std.math.float.snan

Returns a signalling NaN representation for a floating point Type. TODO: LLVM is known to miscompile on some architectures to quiet NaN - this is tracked by https://github.com/ziglang/zig/issues/14366

Prototype

pub inline fn snan(comptime Type: type) Type

Parameters

Type: type

Example

 test snan {
    const snan_u16: u16 = 0x7D00;
    const snan_u32: u32 = 0x7FA00000;
    const snan_u64: u64 = 0x7FF4000000000000;
    const snan_u80: u80 = 0x7FFFA000000000000000;
    const snan_u128: u128 = 0x7FFF4000000000000000000000000000;
    try expectEqual(snan_u16, @as(u16, @bitCast(snan(f16))));
    try expectEqual(snan_u32, @as(u32, @bitCast(snan(f32))));
    try expectEqual(snan_u64, @as(u64, @bitCast(snan(f64))));
    try expectEqual(snan_u80, @as(u80, @bitCast(snan(f80))));
    try expectEqual(snan_u128, @as(u128, @bitCast(snan(f128))));
}

Source

  pub inline fn snan(comptime Type: type) Type {
    const RuntimeType = switch (Type) {
        else => Type,
        comptime_float => f128, // any float type will do
    };
    return reconstructFloat(
        RuntimeType,
        floatExponentMax(RuntimeType) + 1,
        mantissaOne(RuntimeType) | 1 << (floatFractionalBits(RuntimeType) - 2),
    );
}  