From bab358aac9fea320c9cee155b544ccec0f5bd4f5 Mon Sep 17 00:00:00 2001
From: Student Main <studentmain@aosc.io>
Date: Tue, 25 Aug 2026 04:30:36 +0800
Subject: [PATCH] Allow memset fallback to non SIMD implementation on x86

---
 crates/stdext/src/simd/memset.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/crates/stdext/src/simd/memset.rs b/crates/stdext/src/simd/memset.rs
index 15d921220f3..f4bbdede6ea 100644
--- a/crates/stdext/src/simd/memset.rs
+++ b/crates/stdext/src/simd/memset.rs
@@ -93,7 +93,13 @@ static mut MEMSET_DISPATCH: unsafe fn(beg: *mut u8, end: *mut u8, val: u64) = me
 
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 fn memset_dispatch(beg: *mut u8, end: *mut u8, val: u64) {
-    let func = if is_x86_feature_detected!("avx2") { memset_avx2 } else { memset_sse2 };
+    let func = if is_x86_feature_detected!("avx2") {
+        memset_avx2
+    } else if is_x86_feature_detected!("sse2") {
+        memset_sse2
+    } else {
+        memset_fallback
+    };
     unsafe { MEMSET_DISPATCH = func };
     unsafe { func(beg, end, val) }
 }