stage1: implement @prefetch() builtin

2 files changed, 28 insertions, 0 deletions

diff --git a/test/behavior.zig b/test/behavior.zig
index 6c793fad53..4a28e1b07a 100644
--- a/test/behavior.zig
+++ b/test/behavior.zig
@@ -169,6 +169,7 @@ test {
                 _ = @import("behavior/optional_stage1.zig");
                 _ = @import("behavior/pointers_stage1.zig");
                 _ = @import("behavior/popcount_stage1.zig");
+                _ = @import("behavior/prefetch.zig");
                 _ = @import("behavior/ptrcast_stage1.zig");
                 _ = @import("behavior/reflection.zig");
                 _ = @import("behavior/saturating_arithmetic_stage1.zig");
diff --git a/test/behavior/prefetch.zig b/test/behavior/prefetch.zig
new file mode 100644
index 0000000000..98dc72a976
--- /dev/null
+++ b/test/behavior/prefetch.zig
@@ -0,0 +1,27 @@
+const std = @import("std");
+
+test "@prefetch()" {
+    var a: u32 = 42;
+
+    @prefetch(&a, .{});
+
+    @prefetch(&a, .{ .rw = .read, .locality = 3, .cache = .data });
+    @prefetch(&a, .{ .rw = .read, .locality = 2, .cache = .data });
+    @prefetch(&a, .{ .rw = .read, .locality = 1, .cache = .data });
+    @prefetch(&a, .{ .rw = .read, .locality = 0, .cache = .data });
+
+    @prefetch(&a, .{ .rw = .write, .locality = 3, .cache = .data });
+    @prefetch(&a, .{ .rw = .write, .locality = 2, .cache = .data });
+    @prefetch(&a, .{ .rw = .write, .locality = 1, .cache = .data });
+    @prefetch(&a, .{ .rw = .write, .locality = 0, .cache = .data });
+
+    @prefetch(&a, .{ .rw = .read, .locality = 3, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .read, .locality = 2, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .read, .locality = 1, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .read, .locality = 0, .cache = .instruction });
+
+    @prefetch(&a, .{ .rw = .write, .locality = 3, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .write, .locality = 2, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .write, .locality = 1, .cache = .instruction });
+    @prefetch(&a, .{ .rw = .write, .locality = 0, .cache = .instruction });
+}