From 175463d75dbde1e8e4c5a55159ab4e9446fd211c Mon Sep 17 00:00:00 2001
From: Isaac Freund <isaac.freund@coil.com>
Date: Tue, 7 Dec 2021 19:34:44 +0100
Subject: AstGen: implement @prefetch() builtin

---
 lib/std/builtin.zig | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'lib/std')

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
@@ -651,6 +651,31 @@ 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 {
-- 
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