Meg's Mirrors

zig

1	const builtin = @import("builtin");
2	const std = @import("std");
3	const math = std.math;
4	const mem = std.mem;
5	const testing = std.testing;
6
7	const qnan_u16: u16 = 0x7E00;
8	const snan_u16: u16 = 0x7D00;
9	const qnan_u32: u32 = 0x7FC00000;
10	const snan_u32: u32 = 0x7FA00000;
11	const qnan_u64: u64 = 0x7FF8000000000000;
12	const snan_u64: u64 = 0x7FF4000000000000;
13	const qnan_u128: u128 = 0x7FFF8000000000000000000000000000;
14	const snan_u128: u128 = 0x7FFF4000000000000000000000000000;
15	const qnan_f16: f16 = math.nan(f16);
16	const snan_f16: f16 = math.snan(f16);
17	const qnan_f32: f32 = math.nan(f32);
18	const snan_f32: f32 = math.snan(f32);
19	const qnan_f64: f64 = math.nan(f64);
20	const snan_f64: f64 = math.snan(f64);
21	const qnan_f128: f128 = math.nan(f128);
22	const snan_f128: f128 = math.snan(f128);
23
24	test "nan memory equality" {
25	if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest;
26	if (builtin.zig_backend == .stage2_c) return error.SkipZigTest;
27	if (builtin.zig_backend == .stage2_spirv) return error.SkipZigTest;
28
29	// signaled
30	try testing.expect(mem.eql(u8, mem.asBytes(&snan_u16), mem.asBytes(&snan_f16)));
31	try testing.expect(mem.eql(u8, mem.asBytes(&snan_u32), mem.asBytes(&snan_f32)));
32	try testing.expect(mem.eql(u8, mem.asBytes(&snan_u64), mem.asBytes(&snan_f64)));
33	try testing.expect(mem.eql(u8, mem.asBytes(&snan_u128), mem.asBytes(&snan_f128)));
34
35	// quiet
36	try testing.expect(mem.eql(u8, mem.asBytes(&qnan_u16), mem.asBytes(&qnan_f16)));
37	try testing.expect(mem.eql(u8, mem.asBytes(&qnan_u32), mem.asBytes(&qnan_f32)));
38	try testing.expect(mem.eql(u8, mem.asBytes(&qnan_u64), mem.asBytes(&qnan_f64)));
39	try testing.expect(mem.eql(u8, mem.asBytes(&qnan_u128), mem.asBytes(&qnan_f128)));
40	}