stage2: add vectorized overflow arithmetic behavior tests

Author: sengir

test/behavior/vector.zig

@@ -879,3 +879,79 @@ test "saturating shift-left" {
     try S.doTheTest();
     comptime try S.doTheTest();
 }
+
+test "@addWithOverflow" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var result: @Vector(4, u8) = undefined;
+            var overflow = @addWithOverflow(@Vector(4, u8), @Vector(4, u8){ 250, 250, 250, 250 }, @Vector(4, u8){ 0, 5, 6, 10 }, &result);
+            var expected: @Vector(4, bool) = .{ false, false, true, true };
+            try expect(mem.eql(bool, &@as([4]bool, overflow), &@as([4]bool, expected)));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "@subWithOverflow" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var result: @Vector(4, i8) = undefined;
+            var overflow = @subWithOverflow(@Vector(4, i8), @Vector(4, i8){ -120, -120, 120, 120 }, @Vector(4, i8){ 8, 9, -7, -8 }, &result);
+            var expected: @Vector(4, bool) = .{ false, true, false, true };
+            try expect(mem.eql(bool, &@as([4]bool, overflow), &@as([4]bool, expected)));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "@mulWithOverflow" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var result: @Vector(4, u8) = undefined;
+            var overflow = @mulWithOverflow(@Vector(4, u8), @Vector(4, u8){ 10, 10, 10, 10 }, @Vector(4, u8){ 25, 26, 0, 30 }, &result);
+            var expected: @Vector(4, bool) = .{ false, true, false, true };
+            try expect(mem.eql(bool, &@as([4]bool, overflow), &@as([4]bool, expected)));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
+test "@shlWithOverflow" {
+    if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+    if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
+
+    const S = struct {
+        fn doTheTest() !void {
+            var result: @Vector(4, u8) = undefined;
+            var overflow = @shlWithOverflow(@Vector(4, u8), @Vector(4, u8){ 0, 1, 8, 255 }, @Vector(4, u3){ 7, 7, 7, 7 }, &result);
+            var expected: @Vector(4, bool) = .{ false, false, true, true };
+            try expect(mem.eql(bool, &@as([4]bool, overflow), &@as([4]bool, expected)));
+        }
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}