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zig/test/behavior/math.zig
Andrew Kelley 5619ce2406 Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen 
Conflicts:
 * doc/langref.html.in
 * lib/std/enums.zig
 * lib/std/fmt.zig
 * lib/std/hash/auto_hash.zig
 * lib/std/math.zig
 * lib/std/mem.zig
 * lib/std/meta.zig
 * test/behavior/alignof.zig
 * test/behavior/bitcast.zig
 * test/behavior/bugs/1421.zig
 * test/behavior/cast.zig
 * test/behavior/ptrcast.zig
 * test/behavior/type_info.zig
 * test/behavior/vector.zig

Master branch added `try` to a bunch of testing function calls, and some
lines also had changed how to refer to the native architecture and other
`@import("builtin")` stuff.
2021-05-08 14:45:21 -07:00

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const std = @import("std");
const expect = std.testing.expect;
const expectEqual = std.testing.expectEqual;
const expectEqualSlices = std.testing.expectEqualSlices;
const maxInt = std.math.maxInt;
const minInt = std.math.minInt;
const mem = std.mem;
test "division" {
try testDivision();
comptime try testDivision();
}
fn testDivision() !void {
try expect(div(u32, 13, 3) == 4);
try expect(div(f16, 1.0, 2.0) == 0.5);
try expect(div(f32, 1.0, 2.0) == 0.5);
try expect(divExact(u32, 55, 11) == 5);
try expect(divExact(i32, -55, 11) == -5);
try expect(divExact(f16, 55.0, 11.0) == 5.0);
try expect(divExact(f16, -55.0, 11.0) == -5.0);
try expect(divExact(f32, 55.0, 11.0) == 5.0);
try expect(divExact(f32, -55.0, 11.0) == -5.0);
try expect(divFloor(i32, 5, 3) == 1);
try expect(divFloor(i32, -5, 3) == -2);
try expect(divFloor(f16, 5.0, 3.0) == 1.0);
try expect(divFloor(f16, -5.0, 3.0) == -2.0);
try expect(divFloor(f32, 5.0, 3.0) == 1.0);
try expect(divFloor(f32, -5.0, 3.0) == -2.0);
try expect(divFloor(i32, -0x80000000, -2) == 0x40000000);
try expect(divFloor(i32, 0, -0x80000000) == 0);
try expect(divFloor(i32, -0x40000001, 0x40000000) == -2);
try expect(divFloor(i32, -0x80000000, 1) == -0x80000000);
try expect(divFloor(i32, 10, 12) == 0);
try expect(divFloor(i32, -14, 12) == -2);
try expect(divFloor(i32, -2, 12) == -1);
try expect(divTrunc(i32, 5, 3) == 1);
try expect(divTrunc(i32, -5, 3) == -1);
try expect(divTrunc(f16, 5.0, 3.0) == 1.0);
try expect(divTrunc(f16, -5.0, 3.0) == -1.0);
try expect(divTrunc(f32, 5.0, 3.0) == 1.0);
try expect(divTrunc(f32, -5.0, 3.0) == -1.0);
try expect(divTrunc(f64, 5.0, 3.0) == 1.0);
try expect(divTrunc(f64, -5.0, 3.0) == -1.0);
try expect(divTrunc(i32, 10, 12) == 0);
try expect(divTrunc(i32, -14, 12) == -1);
try expect(divTrunc(i32, -2, 12) == 0);
try expect(mod(i32, 10, 12) == 10);
try expect(mod(i32, -14, 12) == 10);
try expect(mod(i32, -2, 12) == 10);
comptime {
try expect(
1194735857077236777412821811143690633098347576 % 508740759824825164163191790951174292733114988 == 177254337427586449086438229241342047632117600,
);
try expect(
@rem(-1194735857077236777412821811143690633098347576, 508740759824825164163191790951174292733114988) == -177254337427586449086438229241342047632117600,
);
try expect(
1194735857077236777412821811143690633098347576 / 508740759824825164163191790951174292733114988 == 2,
);
try expect(
@divTrunc(-1194735857077236777412821811143690633098347576, 508740759824825164163191790951174292733114988) == -2,
);
try expect(
@divTrunc(1194735857077236777412821811143690633098347576, -508740759824825164163191790951174292733114988) == -2,
);
try expect(
@divTrunc(-1194735857077236777412821811143690633098347576, -508740759824825164163191790951174292733114988) == 2,
);
try expect(
4126227191251978491697987544882340798050766755606969681711 % 10 == 1,
);
}
}
fn div(comptime T: type, a: T, b: T) T {
return a / b;
}
fn divExact(comptime T: type, a: T, b: T) T {
return @divExact(a, b);
}
fn divFloor(comptime T: type, a: T, b: T) T {
return @divFloor(a, b);
}
fn divTrunc(comptime T: type, a: T, b: T) T {
return @divTrunc(a, b);
}
fn mod(comptime T: type, a: T, b: T) T {
return @mod(a, b);
}
test "@addWithOverflow" {
var result: u8 = undefined;
try expect(@addWithOverflow(u8, 250, 100, &result));
try expect(!@addWithOverflow(u8, 100, 150, &result));
try expect(result == 250);
}
// TODO test mulWithOverflow
// TODO test subWithOverflow
test "@shlWithOverflow" {
var result: u16 = undefined;
try expect(@shlWithOverflow(u16, 0b0010111111111111, 3, &result));
try expect(!@shlWithOverflow(u16, 0b0010111111111111, 2, &result));
try expect(result == 0b1011111111111100);
}
test "@*WithOverflow with u0 values" {
var result: u0 = undefined;
try expect(!@addWithOverflow(u0, 0, 0, &result));
try expect(!@subWithOverflow(u0, 0, 0, &result));
try expect(!@mulWithOverflow(u0, 0, 0, &result));
try expect(!@shlWithOverflow(u0, 0, 0, &result));
}
test "@clz" {
try testClz();
comptime try testClz();
}
fn testClz() !void {
try expect(clz(u8, 0b10001010) == 0);
try expect(clz(u8, 0b00001010) == 4);
try expect(clz(u8, 0b00011010) == 3);
try expect(clz(u8, 0b00000000) == 8);
try expect(clz(u128, 0xffffffffffffffff) == 64);
try expect(clz(u128, 0x10000000000000000) == 63);
}
fn clz(comptime T: type, x: T) usize {
return @clz(T, x);
}
test "@ctz" {
try testCtz();
comptime try testCtz();
}
fn testCtz() !void {
try expect(ctz(u8, 0b10100000) == 5);
try expect(ctz(u8, 0b10001010) == 1);
try expect(ctz(u8, 0b00000000) == 8);
try expect(ctz(u16, 0b00000000) == 16);
}
fn ctz(comptime T: type, x: T) usize {
return @ctz(T, x);
}
test "assignment operators" {
var i: u32 = 0;
i += 5;
try expect(i == 5);
i -= 2;
try expect(i == 3);
i *= 20;
try expect(i == 60);
i /= 3;
try expect(i == 20);
i %= 11;
try expect(i == 9);
i <<= 1;
try expect(i == 18);
i >>= 2;
try expect(i == 4);
i = 6;
i &= 5;
try expect(i == 4);
i ^= 6;
try expect(i == 2);
i = 6;
i |= 3;
try expect(i == 7);
}
test "three expr in a row" {
try testThreeExprInARow(false, true);
comptime try testThreeExprInARow(false, true);
}
fn testThreeExprInARow(f: bool, t: bool) !void {
try assertFalse(f or f or f);
try assertFalse(t and t and f);
try assertFalse(1 | 2 | 4 != 7);
try assertFalse(3 ^ 6 ^ 8 != 13);
try assertFalse(7 & 14 & 28 != 4);
try assertFalse(9 << 1 << 2 != 9 << 3);
try assertFalse(90 >> 1 >> 2 != 90 >> 3);
try assertFalse(100 - 1 + 1000 != 1099);
try assertFalse(5 * 4 / 2 % 3 != 1);
try assertFalse(@as(i32, @as(i32, 5)) != 5);
try assertFalse(!!false);
try assertFalse(@as(i32, 7) != --(@as(i32, 7)));
}
fn assertFalse(b: bool) !void {
try expect(!b);
}
test "const number literal" {
const one = 1;
const eleven = ten + one;
try expect(eleven == 11);
}
const ten = 10;
test "unsigned wrapping" {
try testUnsignedWrappingEval(maxInt(u32));
comptime try testUnsignedWrappingEval(maxInt(u32));
}
fn testUnsignedWrappingEval(x: u32) !void {
const zero = x +% 1;
try expect(zero == 0);
const orig = zero -% 1;
try expect(orig == maxInt(u32));
}
test "signed wrapping" {
try testSignedWrappingEval(maxInt(i32));
comptime try testSignedWrappingEval(maxInt(i32));
}
fn testSignedWrappingEval(x: i32) !void {
const min_val = x +% 1;
try expect(min_val == minInt(i32));
const max_val = min_val -% 1;
try expect(max_val == maxInt(i32));
}
test "signed negation wrapping" {
try testSignedNegationWrappingEval(minInt(i16));
comptime try testSignedNegationWrappingEval(minInt(i16));
}
fn testSignedNegationWrappingEval(x: i16) !void {
try expect(x == -32768);
const neg = -%x;
try expect(neg == -32768);
}
test "unsigned negation wrapping" {
try testUnsignedNegationWrappingEval(1);
comptime try testUnsignedNegationWrappingEval(1);
}
fn testUnsignedNegationWrappingEval(x: u16) !void {
try expect(x == 1);
const neg = -%x;
try expect(neg == maxInt(u16));
}
test "unsigned 64-bit division" {
try test_u64_div();
comptime try test_u64_div();
}
fn test_u64_div() !void {
const result = divWithResult(1152921504606846976, 34359738365);
try expect(result.quotient == 33554432);
try expect(result.remainder == 100663296);
}
fn divWithResult(a: u64, b: u64) DivResult {
return DivResult{
.quotient = a / b,
.remainder = a % b,
};
}
const DivResult = struct {
quotient: u64,
remainder: u64,
};
test "binary not" {
try expect(comptime x: {
break :x ~@as(u16, 0b1010101010101010) == 0b0101010101010101;
});
try expect(comptime x: {
break :x ~@as(u64, 2147483647) == 18446744071562067968;
});
try testBinaryNot(0b1010101010101010);
}
fn testBinaryNot(x: u16) !void {
try expect(~x == 0b0101010101010101);
}
test "small int addition" {
var x: u2 = 0;
try expect(x == 0);
x += 1;
try expect(x == 1);
x += 1;
try expect(x == 2);
x += 1;
try expect(x == 3);
var result: @TypeOf(x) = 3;
try expect(@addWithOverflow(@TypeOf(x), x, 1, &result));
try expect(result == 0);
}
test "float equality" {
const x: f64 = 0.012;
const y: f64 = x + 1.0;
try testFloatEqualityImpl(x, y);
comptime try testFloatEqualityImpl(x, y);
}
fn testFloatEqualityImpl(x: f64, y: f64) !void {
const y2 = x + 1.0;
try expect(y == y2);
}
test "allow signed integer division/remainder when values are comptime known and positive or exact" {
try expect(5 / 3 == 1);
try expect(-5 / -3 == 1);
try expect(-6 / 3 == -2);
try expect(5 % 3 == 2);
try expect(-6 % 3 == 0);
}
test "hex float literal parsing" {
comptime try expect(0x1.0 == 1.0);
}
test "quad hex float literal parsing in range" {
const a = 0x1.af23456789bbaaab347645365cdep+5;
const b = 0x1.dedafcff354b6ae9758763545432p-9;
const c = 0x1.2f34dd5f437e849b4baab754cdefp+4534;
const d = 0x1.edcbff8ad76ab5bf46463233214fp-435;
}
test "quad hex float literal parsing accurate" {
const a: f128 = 0x1.1111222233334444555566667777p+0;
// implied 1 is dropped, with an exponent of 0 (0x3fff) after biasing.
const expected: u128 = 0x3fff1111222233334444555566667777;
try expect(@bitCast(u128, a) == expected);
// non-normalized
const b: f128 = 0x11.111222233334444555566667777p-4;
try expect(@bitCast(u128, b) == expected);
const S = struct {
fn doTheTest() !void {
{
var f: f128 = 0x1.2eab345678439abcdefea56782346p+5;
try expect(@bitCast(u128, f) == 0x40042eab345678439abcdefea5678234);
}
{
var f: f128 = 0x1.edcb34a235253948765432134674fp-1;
try expect(@bitCast(u128, f) == 0x3ffeedcb34a235253948765432134674);
}
{
var f: f128 = 0x1.353e45674d89abacc3a2ebf3ff4ffp-50;
try expect(@bitCast(u128, f) == 0x3fcd353e45674d89abacc3a2ebf3ff50);
}
{
var f: f128 = 0x1.ed8764648369535adf4be3214567fp-9;
try expect(@bitCast(u128, f) == 0x3ff6ed8764648369535adf4be3214568);
}
const exp2ft = [_]f64{
0x1.6a09e667f3bcdp-1,
0x1.7a11473eb0187p-1,
0x1.8ace5422aa0dbp-1,
0x1.9c49182a3f090p-1,
0x1.ae89f995ad3adp-1,
0x1.c199bdd85529cp-1,
0x1.d5818dcfba487p-1,
0x1.ea4afa2a490dap-1,
0x1.0000000000000p+0,
0x1.0b5586cf9890fp+0,
0x1.172b83c7d517bp+0,
0x1.2387a6e756238p+0,
0x1.306fe0a31b715p+0,
0x1.3dea64c123422p+0,
0x1.4bfdad5362a27p+0,
0x1.5ab07dd485429p+0,
0x1.8p23,
0x1.62e430p-1,
0x1.ebfbe0p-3,
0x1.c6b348p-5,
0x1.3b2c9cp-7,
0x1.0p127,
-0x1.0p-149,
};
const answers = [_]u64{
0x3fe6a09e667f3bcd,
0x3fe7a11473eb0187,
0x3fe8ace5422aa0db,
0x3fe9c49182a3f090,
0x3feae89f995ad3ad,
0x3fec199bdd85529c,
0x3fed5818dcfba487,
0x3feea4afa2a490da,
0x3ff0000000000000,
0x3ff0b5586cf9890f,
0x3ff172b83c7d517b,
0x3ff2387a6e756238,
0x3ff306fe0a31b715,
0x3ff3dea64c123422,
0x3ff4bfdad5362a27,
0x3ff5ab07dd485429,
0x4168000000000000,
0x3fe62e4300000000,
0x3fcebfbe00000000,
0x3fac6b3480000000,
0x3f83b2c9c0000000,
0x47e0000000000000,
0xb6a0000000000000,
};
for (exp2ft) |x, i| {
try expect(@bitCast(u64, x) == answers[i]);
}
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
test "underscore separator parsing" {
try expect(0_0_0_0 == 0);
try expect(1_234_567 == 1234567);
try expect(001_234_567 == 1234567);
try expect(0_0_1_2_3_4_5_6_7 == 1234567);
try expect(0b0_0_0_0 == 0);
try expect(0b1010_1010 == 0b10101010);
try expect(0b0000_1010_1010 == 0b10101010);
try expect(0b1_0_1_0_1_0_1_0 == 0b10101010);
try expect(0o0_0_0_0 == 0);
try expect(0o1010_1010 == 0o10101010);
try expect(0o0000_1010_1010 == 0o10101010);
try expect(0o1_0_1_0_1_0_1_0 == 0o10101010);
try expect(0x0_0_0_0 == 0);
try expect(0x1010_1010 == 0x10101010);
try expect(0x0000_1010_1010 == 0x10101010);
try expect(0x1_0_1_0_1_0_1_0 == 0x10101010);
try expect(123_456.789_000e1_0 == 123456.789000e10);
try expect(0_1_2_3_4_5_6.7_8_9_0_0_0e0_0_1_0 == 123456.789000e10);
try expect(0x1234_5678.9ABC_DEF0p-1_0 == 0x12345678.9ABCDEF0p-10);
try expect(0x1_2_3_4_5_6_7_8.9_A_B_C_D_E_F_0p-0_0_0_1_0 == 0x12345678.9ABCDEF0p-10);
}
test "hex float literal within range" {
const a = 0x1.0p16383;
const b = 0x0.1p16387;
const c = 0x1.0p-16382;
}
test "truncating shift left" {
try testShlTrunc(maxInt(u16));
comptime try testShlTrunc(maxInt(u16));
}
fn testShlTrunc(x: u16) !void {
const shifted = x << 1;
try expect(shifted == 65534);
}
test "truncating shift right" {
try testShrTrunc(maxInt(u16));
comptime try testShrTrunc(maxInt(u16));
}
fn testShrTrunc(x: u16) !void {
const shifted = x >> 1;
try expect(shifted == 32767);
}
test "exact shift left" {
try testShlExact(0b00110101);
comptime try testShlExact(0b00110101);
}
fn testShlExact(x: u8) !void {
const shifted = @shlExact(x, 2);
try expect(shifted == 0b11010100);
}
test "exact shift right" {
try testShrExact(0b10110100);
comptime try testShrExact(0b10110100);
}
fn testShrExact(x: u8) !void {
const shifted = @shrExact(x, 2);
try expect(shifted == 0b00101101);
}
test "shift left/right on u0 operand" {
const S = struct {
fn doTheTest() !void {
var x: u0 = 0;
var y: u0 = 0;
try expectEqual(@as(u0, 0), x << 0);
try expectEqual(@as(u0, 0), x >> 0);
try expectEqual(@as(u0, 0), x << y);
try expectEqual(@as(u0, 0), x >> y);
try expectEqual(@as(u0, 0), @shlExact(x, 0));
try expectEqual(@as(u0, 0), @shrExact(x, 0));
try expectEqual(@as(u0, 0), @shlExact(x, y));
try expectEqual(@as(u0, 0), @shrExact(x, y));
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
test "comptime_int addition" {
comptime {
try expect(35361831660712422535336160538497375248 + 101752735581729509668353361206450473702 == 137114567242441932203689521744947848950);
try expect(594491908217841670578297176641415611445982232488944558774612 + 390603545391089362063884922208143568023166603618446395589768 == 985095453608931032642182098849559179469148836107390954364380);
}
}
test "comptime_int multiplication" {
comptime {
try expect(
45960427431263824329884196484953148229 * 128339149605334697009938835852565949723 == 5898522172026096622534201617172456926982464453350084962781392314016180490567,
);
try expect(
594491908217841670578297176641415611445982232488944558774612 * 390603545391089362063884922208143568023166603618446395589768 == 232210647056203049913662402532976186578842425262306016094292237500303028346593132411865381225871291702600263463125370016,
);
}
}
test "comptime_int shifting" {
comptime {
try expect((@as(u128, 1) << 127) == 0x80000000000000000000000000000000);
}
}
test "comptime_int multi-limb shift and mask" {
comptime {
var a = 0xefffffffa0000001eeeeeeefaaaaaaab;
try expect(@as(u32, a & 0xffffffff) == 0xaaaaaaab);
a >>= 32;
try expect(@as(u32, a & 0xffffffff) == 0xeeeeeeef);
a >>= 32;
try expect(@as(u32, a & 0xffffffff) == 0xa0000001);
a >>= 32;
try expect(@as(u32, a & 0xffffffff) == 0xefffffff);
a >>= 32;
try expect(a == 0);
}
}
test "comptime_int multi-limb partial shift right" {
comptime {
var a = 0x1ffffffffeeeeeeee;
a >>= 16;
try expect(a == 0x1ffffffffeeee);
}
}
test "xor" {
try test_xor();
comptime try test_xor();
}
fn test_xor() !void {
try expect(0xFF ^ 0x00 == 0xFF);
try expect(0xF0 ^ 0x0F == 0xFF);
try expect(0xFF ^ 0xF0 == 0x0F);
try expect(0xFF ^ 0x0F == 0xF0);
try expect(0xFF ^ 0xFF == 0x00);
}
test "comptime_int xor" {
comptime {
try expect(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF ^ 0x00000000000000000000000000000000 == 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
try expect(0xFFFFFFFFFFFFFFFF0000000000000000 ^ 0x0000000000000000FFFFFFFFFFFFFFFF == 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
try expect(0xFFFFFFFFFFFFFFFF0000000000000000 ^ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0x0000000000000000FFFFFFFFFFFFFFFF);
try expect(0x0000000000000000FFFFFFFFFFFFFFFF ^ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0xFFFFFFFFFFFFFFFF0000000000000000);
try expect(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF ^ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0x00000000000000000000000000000000);
try expect(0xFFFFFFFF00000000FFFFFFFF00000000 ^ 0x00000000FFFFFFFF00000000FFFFFFFF == 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
try expect(0xFFFFFFFF00000000FFFFFFFF00000000 ^ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0x00000000FFFFFFFF00000000FFFFFFFF);
try expect(0x00000000FFFFFFFF00000000FFFFFFFF ^ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0xFFFFFFFF00000000FFFFFFFF00000000);
}
}
test "f128" {
try test_f128();
comptime try test_f128();
}
fn make_f128(x: f128) f128 {
return x;
}
fn test_f128() !void {
try expect(@sizeOf(f128) == 16);
try expect(make_f128(1.0) == 1.0);
try expect(make_f128(1.0) != 1.1);
try expect(make_f128(1.0) > 0.9);
try expect(make_f128(1.0) >= 0.9);
try expect(make_f128(1.0) >= 1.0);
try should_not_be_zero(1.0);
}
fn should_not_be_zero(x: f128) !void {
try expect(x != 0.0);
}
test "comptime float rem int" {
comptime {
var x = @as(f32, 1) % 2;
try expect(x == 1.0);
}
}
test "remainder division" {
comptime try remdiv(f16);
comptime try remdiv(f32);
comptime try remdiv(f64);
comptime try remdiv(f128);
try remdiv(f16);
try remdiv(f64);
try remdiv(f128);
}
fn remdiv(comptime T: type) !void {
try expect(@as(T, 1) == @as(T, 1) % @as(T, 2));
try expect(@as(T, 1) == @as(T, 7) % @as(T, 3));
}
test "@sqrt" {
try testSqrt(f64, 12.0);
comptime try testSqrt(f64, 12.0);
try testSqrt(f32, 13.0);
comptime try testSqrt(f32, 13.0);
try testSqrt(f16, 13.0);
comptime try testSqrt(f16, 13.0);
const x = 14.0;
const y = x * x;
const z = @sqrt(y);
comptime try expect(z == x);
}
fn testSqrt(comptime T: type, x: T) !void {
try expect(@sqrt(x * x) == x);
}
test "@fabs" {
try testFabs(f128, 12.0);
comptime try testFabs(f128, 12.0);
try testFabs(f64, 12.0);
comptime try testFabs(f64, 12.0);
try testFabs(f32, 12.0);
comptime try testFabs(f32, 12.0);
try testFabs(f16, 12.0);
comptime try testFabs(f16, 12.0);
const x = 14.0;
const y = -x;
const z = @fabs(y);
comptime try expectEqual(x, z);
}
fn testFabs(comptime T: type, x: T) !void {
const y = -x;
const z = @fabs(y);
try expectEqual(x, z);
}
test "@floor" {
// FIXME: Generates a floorl function call
// testFloor(f128, 12.0);
comptime try testFloor(f128, 12.0);
try testFloor(f64, 12.0);
comptime try testFloor(f64, 12.0);
try testFloor(f32, 12.0);
comptime try testFloor(f32, 12.0);
try testFloor(f16, 12.0);
comptime try testFloor(f16, 12.0);
const x = 14.0;
const y = x + 0.7;
const z = @floor(y);
comptime try expectEqual(x, z);
}
fn testFloor(comptime T: type, x: T) !void {
const y = x + 0.6;
const z = @floor(y);
try expectEqual(x, z);
}
test "@ceil" {
// FIXME: Generates a ceill function call
//testCeil(f128, 12.0);
comptime try testCeil(f128, 12.0);
try testCeil(f64, 12.0);
comptime try testCeil(f64, 12.0);
try testCeil(f32, 12.0);
comptime try testCeil(f32, 12.0);
try testCeil(f16, 12.0);
comptime try testCeil(f16, 12.0);
const x = 14.0;
const y = x - 0.7;
const z = @ceil(y);
comptime try expectEqual(x, z);
}
fn testCeil(comptime T: type, x: T) !void {
const y = x - 0.8;
const z = @ceil(y);
try expectEqual(x, z);
}
test "@trunc" {
// FIXME: Generates a truncl function call
//testTrunc(f128, 12.0);
comptime try testTrunc(f128, 12.0);
try testTrunc(f64, 12.0);
comptime try testTrunc(f64, 12.0);
try testTrunc(f32, 12.0);
comptime try testTrunc(f32, 12.0);
try testTrunc(f16, 12.0);
comptime try testTrunc(f16, 12.0);
const x = 14.0;
const y = x + 0.7;
const z = @trunc(y);
comptime try expectEqual(x, z);
}
fn testTrunc(comptime T: type, x: T) !void {
{
const y = x + 0.8;
const z = @trunc(y);
try expectEqual(x, z);
}
{
const y = -x - 0.8;
const z = @trunc(y);
try expectEqual(-x, z);
}
}
test "@round" {
// FIXME: Generates a roundl function call
//testRound(f128, 12.0);
comptime try testRound(f128, 12.0);
try testRound(f64, 12.0);
comptime try testRound(f64, 12.0);
try testRound(f32, 12.0);
comptime try testRound(f32, 12.0);
try testRound(f16, 12.0);
comptime try testRound(f16, 12.0);
const x = 14.0;
const y = x + 0.4;
const z = @round(y);
comptime try expectEqual(x, z);
}
fn testRound(comptime T: type, x: T) !void {
const y = x - 0.5;
const z = @round(y);
try expectEqual(x, z);
}
test "comptime_int param and return" {
const a = comptimeAdd(35361831660712422535336160538497375248, 101752735581729509668353361206450473702);
try expect(a == 137114567242441932203689521744947848950);
const b = comptimeAdd(594491908217841670578297176641415611445982232488944558774612, 390603545391089362063884922208143568023166603618446395589768);
try expect(b == 985095453608931032642182098849559179469148836107390954364380);
}
fn comptimeAdd(comptime a: comptime_int, comptime b: comptime_int) comptime_int {
return a + b;
}
test "vector integer addition" {
const S = struct {
fn doTheTest() !void {
var a: std.meta.Vector(4, i32) = [_]i32{ 1, 2, 3, 4 };
var b: std.meta.Vector(4, i32) = [_]i32{ 5, 6, 7, 8 };
var result = a + b;
var result_array: [4]i32 = result;
const expected = [_]i32{ 6, 8, 10, 12 };
try expectEqualSlices(i32, &expected, &result_array);
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
test "NaN comparison" {
try testNanEqNan(f16);
try testNanEqNan(f32);
try testNanEqNan(f64);
try testNanEqNan(f128);
comptime try testNanEqNan(f16);
comptime try testNanEqNan(f32);
comptime try testNanEqNan(f64);
comptime try testNanEqNan(f128);
}
fn testNanEqNan(comptime F: type) !void {
var nan1 = std.math.nan(F);
var nan2 = std.math.nan(F);
try expect(nan1 != nan2);
try expect(!(nan1 == nan2));
try expect(!(nan1 > nan2));
try expect(!(nan1 >= nan2));
try expect(!(nan1 < nan2));
try expect(!(nan1 <= nan2));
}
test "128-bit multiplication" {
var a: i128 = 3;
var b: i128 = 2;
var c = a * b;
try expect(c == 6);
}
test "vector comparison" {
const S = struct {
fn doTheTest() !void {
var a: std.meta.Vector(6, i32) = [_]i32{ 1, 3, -1, 5, 7, 9 };
var b: std.meta.Vector(6, i32) = [_]i32{ -1, 3, 0, 6, 10, -10 };
try expect(mem.eql(bool, &@as([6]bool, a < b), &[_]bool{ false, false, true, true, true, false }));
try expect(mem.eql(bool, &@as([6]bool, a <= b), &[_]bool{ false, true, true, true, true, false }));
try expect(mem.eql(bool, &@as([6]bool, a == b), &[_]bool{ false, true, false, false, false, false }));
try expect(mem.eql(bool, &@as([6]bool, a != b), &[_]bool{ true, false, true, true, true, true }));
try expect(mem.eql(bool, &@as([6]bool, a > b), &[_]bool{ true, false, false, false, false, true }));
try expect(mem.eql(bool, &@as([6]bool, a >= b), &[_]bool{ true, true, false, false, false, true }));
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
test "compare undefined literal with comptime_int" {
var x = undefined == 1;
// x is now undefined with type bool
x = true;
try expect(x);
}
test "signed zeros are represented properly" {
const S = struct {
fn doTheTest() !void {
inline for ([_]type{ f16, f32, f64, f128 }) |T| {
const ST = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
var as_fp_val = -@as(T, 0.0);
var as_uint_val = @bitCast(ST, as_fp_val);
// Ensure the sign bit is set.
try expect(as_uint_val >> (@typeInfo(T).Float.bits - 1) == 1);
}
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
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