111 lines
4.4 KiB
Zig
111 lines
4.4 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const minInt = std.math.minInt;
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const maxInt = std.math.maxInt;
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const expect = std.testing.expect;
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test "wrapping add" {
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const S = struct {
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fn doTheTest() !void {
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try testWrapAdd(i8, -3, 10, 7);
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try testWrapAdd(i8, -128, -128, 0);
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try testWrapAdd(i2, 1, 1, -2);
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try testWrapAdd(i64, maxInt(i64), 1, minInt(i64));
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try testWrapAdd(i128, maxInt(i128), -maxInt(i128), 0);
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try testWrapAdd(i128, minInt(i128), maxInt(i128), -1);
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try testWrapAdd(i8, 127, 127, -2);
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try testWrapAdd(u8, 3, 10, 13);
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try testWrapAdd(u8, 255, 255, 254);
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try testWrapAdd(u2, 3, 2, 1);
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try testWrapAdd(u3, 7, 1, 0);
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try testWrapAdd(u128, maxInt(u128), 1, minInt(u128));
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}
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fn testWrapAdd(comptime T: type, lhs: T, rhs: T, expected: T) !void {
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try expect((lhs +% rhs) == expected);
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var x = lhs;
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x +%= rhs;
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try expect(x == expected);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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comptime try S.testWrapAdd(comptime_int, 0, 0, 0);
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comptime try S.testWrapAdd(comptime_int, 3, 2, 5);
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comptime try S.testWrapAdd(comptime_int, 651075816498665588400716961808225370057, 468229432685078038144554201546849378455, 1119305249183743626545271163355074748512);
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comptime try S.testWrapAdd(comptime_int, 7, -593423721213448152027139550640105366508, -593423721213448152027139550640105366501);
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}
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test "wrapping subtraction" {
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const S = struct {
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fn doTheTest() !void {
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try testWrapSub(i8, -3, 10, -13);
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try testWrapSub(i8, -128, -128, 0);
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try testWrapSub(i8, -1, 127, -128);
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try testWrapSub(i64, minInt(i64), 1, maxInt(i64));
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try testWrapSub(i128, maxInt(i128), -1, minInt(i128));
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try testWrapSub(i128, minInt(i128), -maxInt(i128), -1);
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try testWrapSub(u8, 10, 3, 7);
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try testWrapSub(u8, 0, 255, 1);
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try testWrapSub(u5, 0, 31, 1);
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try testWrapSub(u128, 0, maxInt(u128), 1);
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}
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fn testWrapSub(comptime T: type, lhs: T, rhs: T, expected: T) !void {
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try expect((lhs -% rhs) == expected);
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var x = lhs;
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x -%= rhs;
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try expect(x == expected);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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comptime try S.testWrapSub(comptime_int, 0, 0, 0);
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comptime try S.testWrapSub(comptime_int, 3, 2, 1);
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comptime try S.testWrapSub(comptime_int, 651075816498665588400716961808225370057, 468229432685078038144554201546849378455, 182846383813587550256162760261375991602);
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comptime try S.testWrapSub(comptime_int, 7, -593423721213448152027139550640105366508, 593423721213448152027139550640105366515);
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}
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test "wrapping multiplication" {
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// TODO: once #9660 has been solved, remove this line
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if (builtin.cpu.arch == .wasm32) return error.SkipZigTest;
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const S = struct {
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fn doTheTest() !void {
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try testWrapMul(i8, -3, 10, -30);
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try testWrapMul(i4, 2, 4, -8);
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try testWrapMul(i8, 2, 127, -2);
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try testWrapMul(i8, -128, -128, 0);
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try testWrapMul(i8, maxInt(i8), maxInt(i8), 1);
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try testWrapMul(i16, maxInt(i16), -1, minInt(i16) + 1);
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try testWrapMul(i128, maxInt(i128), -1, minInt(i128) + 1);
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try testWrapMul(i128, minInt(i128), -1, minInt(i128));
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try testWrapMul(u8, 10, 3, 30);
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try testWrapMul(u8, 2, 255, 254);
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try testWrapMul(u128, maxInt(u128), maxInt(u128), 1);
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}
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fn testWrapMul(comptime T: type, lhs: T, rhs: T, expected: T) !void {
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try expect((lhs *% rhs) == expected);
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var x = lhs;
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x *%= rhs;
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try expect(x == expected);
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}
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};
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try S.doTheTest();
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comptime try S.doTheTest();
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comptime try S.testWrapMul(comptime_int, 0, 0, 0);
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comptime try S.testWrapMul(comptime_int, 3, 2, 6);
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comptime try S.testWrapMul(comptime_int, 651075816498665588400716961808225370057, 468229432685078038144554201546849378455, 304852860194144160265083087140337419215516305999637969803722975979232817921935);
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comptime try S.testWrapMul(comptime_int, 7, -593423721213448152027139550640105366508, -4153966048494137064189976854480737565556);
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}
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