Merge pull request #10295 from ifreund/prefetch

Implement @prefetch()

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 9ce8c1c38e..2ffbdaa5ad 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -653,6 +653,31 @@ pub const CallOptions = struct {
 
 /// This data structure is used by the Zig language code generation and
 /// therefore must be kept in sync with the compiler implementation.
+pub const PrefetchOptions = struct {
+    /// Whether the prefetch should prepare for a read or a write.
+    rw: Rw = .read,
+    /// 0 means no temporal locality. That is, the data can be immediately
+    /// dropped from the cache after it is accessed.
+    ///
+    /// 3 means high temporal locality. That is, the data should be kept in
+    /// the cache as it is likely to be accessed again soon.
+    locality: u2 = 3,
+    /// The cache that the prefetch should be preformed on.
+    cache: Cache = .data,
+
+    pub const Rw = enum {
+        read,
+        write,
+    };
+
+    pub const Cache = enum {
+        instruction,
+        data,
+    };
+};
+
+/// This data structure is used by the Zig language code generation and
+/// therefore must be kept in sync with the compiler implementation.
 pub const ExportOptions = struct {
     name: []const u8,
     linkage: GlobalLinkage = .Strong,