From d262911a0445d24fde0372243302bab95559531f Mon Sep 17 00:00:00 2001
From: Richard Feldman <oss@rtfeldman.com>
Date: Mon, 11 Sep 2023 14:37:30 -0400
Subject: [PATCH] Add prefetching docs

---
 crates/compiler/parse/src/src64.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/compiler/parse/src/src64.rs b/crates/compiler/parse/src/src64.rs
index 3e0c8a5d8f..4b10d88315 100644
--- a/crates/compiler/parse/src/src64.rs
+++ b/crates/compiler/parse/src/src64.rs
@@ -335,6 +335,9 @@ unsafe fn fill_last_64_bytes_with_newlines(ptr: NonNull<u8>, len: usize) {
 
 #[inline(always)]
 fn prefetch_read<T>(non_null_ptr: NonNull<T>, offset: usize) {
+    // Use inline asm until this is stabilized:
+    // https://doc.rust-lang.org/std/intrinsics/fn.prefetch_read_data.html
+
     #[cfg(target_arch = "x86_64")]
     unsafe {
         core::arch::asm!(
@@ -354,6 +357,9 @@ fn prefetch_read<T>(non_null_ptr: NonNull<T>, offset: usize) {
 
 #[inline(always)]
 fn prefetch_readwrite<T>(non_null_ptr: NonNull<T>, offset: usize) {
+    // Use inline asm until this is stabilized:
+    // https://doc.rust-lang.org/std/intrinsics/fn.prefetch_write_data.html
+
     #[cfg(target_arch = "x86_64")]
     unsafe {
         core::arch::asm!(