zig/test/behavior/shuffle.zig

const std = @import("std");
const builtin = @import("builtin");
const mem = std.mem;
const expect = std.testing.expect;
const Vector = std.meta.Vector;

test "@shuffle" {
    const S = struct {
        fn doTheTest() !void {
            var v: Vector(4, i32) = [4]i32{ 2147483647, -2, 30, 40 };
            var x: Vector(4, i32) = [4]i32{ 1, 2147483647, 3, 4 };
            const mask: Vector(4, i32) = [4]i32{ 0, ~@as(i32, 2), 3, ~@as(i32, 3) };
            var res = @shuffle(i32, v, x, mask);
            try expect(mem.eql(i32, &@as([4]i32, res), &[4]i32{ 2147483647, 3, 40, 4 }));

            // Implicit cast from array (of mask)
            res = @shuffle(i32, v, x, [4]i32{ 0, ~@as(i32, 2), 3, ~@as(i32, 3) });
            try expect(mem.eql(i32, &@as([4]i32, res), &[4]i32{ 2147483647, 3, 40, 4 }));

            // Undefined
            const mask2: Vector(4, i32) = [4]i32{ 3, 1, 2, 0 };
            res = @shuffle(i32, v, undefined, mask2);
            try expect(mem.eql(i32, &@as([4]i32, res), &[4]i32{ 40, -2, 30, 2147483647 }));

            // Upcasting of b
            var v2: Vector(2, i32) = [2]i32{ 2147483647, undefined };
            const mask3: Vector(4, i32) = [4]i32{ ~@as(i32, 0), 2, ~@as(i32, 0), 3 };
            res = @shuffle(i32, x, v2, mask3);
            try expect(mem.eql(i32, &@as([4]i32, res), &[4]i32{ 2147483647, 3, 2147483647, 4 }));

            // Upcasting of a
            var v3: Vector(2, i32) = [2]i32{ 2147483647, -2 };
            const mask4: Vector(4, i32) = [4]i32{ 0, ~@as(i32, 2), 1, ~@as(i32, 3) };
            res = @shuffle(i32, v3, x, mask4);
            try expect(mem.eql(i32, &@as([4]i32, res), &[4]i32{ 2147483647, 3, -2, 4 }));

            // bool
            // https://github.com/ziglang/zig/issues/3317
            if (builtin.target.cpu.arch != .mipsel and builtin.target.cpu.arch != .mips) {
                var x2: Vector(4, bool) = [4]bool{ false, true, false, true };
                var v4: Vector(2, bool) = [2]bool{ true, false };
                const mask5: Vector(4, i32) = [4]i32{ 0, ~@as(i32, 1), 1, 2 };
                var res2 = @shuffle(bool, x2, v4, mask5);
                try expect(mem.eql(bool, &@as([4]bool, res2), &[4]bool{ false, false, true, false }));
            }

            // TODO re-enable when LLVM codegen is fixed
            // https://github.com/ziglang/zig/issues/3246
            if (false) {
                var x2: Vector(3, bool) = [3]bool{ false, true, false };
                var v4: Vector(2, bool) = [2]bool{ true, false };
                const mask5: Vector(4, i32) = [4]i32{ 0, ~@as(i32, 1), 1, 2 };
                var res2 = @shuffle(bool, x2, v4, mask5);
                try expect(mem.eql(bool, &@as([4]bool, res2), &[4]bool{ false, false, true, false }));
            }
        }
    };
    try S.doTheTest();
    comptime try S.doTheTest();
}