zig

commit 4c9d06416c1f0e4e7bf5139a705c50ad18f9c39a (tree)
parent 175589fc713d0c706812508fb6bb566b77423b83
Author: Justus Klausecker <justusk@noreply.codeberg.org>
Date:   Mon, 29 Jun 2026 11:31:49 +0200

Merge pull request 'Test coverage for overlapping assignments' (#35918) from Fri3dNstuff/zig:overlapping-copy into master

Reviewed-on: https://codeberg.org/ziglang/zig/pulls/35918
Reviewed-by: Justus Klausecker <justusk@noreply.codeberg.org>

Diffstat:
M
test/behavior.zig
 | 
1
+
A
test/behavior/overlapping_assign.zig
 | 
49
+++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/test/behavior.zig b/test/behavior.zig
@@ -60,6 +60,7 @@ test {
     _ = @import("behavior/nan.zig");
     _ = @import("behavior/null.zig");
     _ = @import("behavior/optional.zig");
+    _ = @import("behavior/overlapping_assign.zig");
     _ = @import("behavior/packed-struct.zig");
     _ = @import("behavior/packed_struct_explicit_backing_int.zig");
     _ = @import("behavior/packed-union.zig");
diff --git a/test/behavior/overlapping_assign.zig b/test/behavior/overlapping_assign.zig
@@ -0,0 +1,49 @@
+const std = @import("std");
+const expect = std.testing.expect;
+
+test "assignment to overlapping memory" {
+    try theTest();
+    try comptime theTest();
+}
+
+fn theTest() !void {
+    var a1: [3]usize = .{ 0, 1, 2 };
+    const b1: [3]usize = .{ 0, 0, 1 };
+    a1[1..3].* = a1[0..2].*;
+    for (a1, b1) |a, b| {
+        try expect(a == b);
+    }
+
+    var a2: [3]usize = .{ 0, 1, 2 };
+    const b2: [3]usize = .{ 1, 2, 2 };
+    a2[0..2].* = a2[1..3].*;
+    for (a2, b2) |a, b| {
+        try expect(a == b);
+    }
+
+    var a3: [16]u8 = .{
+        0, 1, 2,  3,  4,  5,  6,  7,
+        8, 9, 10, 11, 12, 13, 14, 15,
+    };
+    const b3: [16]u8 = .{
+        0, 0, 1, 2,  3,  4,  5,  6,
+        7, 8, 9, 10, 11, 12, 13, 14,
+    };
+    a3[1..16].* = a3[0..15].*;
+    for (a3, b3) |a, b| {
+        try expect(a == b);
+    }
+
+    var a4: [16]u8 = .{
+        0, 1, 2,  3,  4,  5,  6,  7,
+        8, 9, 10, 11, 12, 13, 14, 15,
+    };
+    const b4: [16]u8 = .{
+        1, 2,  3,  4,  5,  6,  7,  8,
+        9, 10, 11, 12, 13, 14, 15, 15,
+    };
+    a4[0..15].* = a4[1..16].*;
+    for (a4, b4) |a, b| {
+        try expect(a == b);
+    }
+}