From 94b115ebdc0bc437e8c26c481d564c691f51c30e Mon Sep 17 00:00:00 2001
From: Martin Kroeker <martin@ruby.chemie.uni-freiburg.de>
Date: Wed, 14 Oct 2026 14:19:28 +0200
Subject: [PATCH] Use explicit zeroing of y for beta=0 in the non-unit stride
 path as well

---
 kernel/arm64/sbgemv_n_neon.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/kernel/arm64/sbgemv_n_neon.c b/kernel/arm64/sbgemv_n_neon.c
index ff730407fd..eb1063ba21 100644
--- a/kernel/arm64/sbgemv_n_neon.c
+++ b/kernel/arm64/sbgemv_n_neon.c
@@ -494,10 +494,17 @@ int CNAME(BLASLONG m, BLASLONG n, FLOAT alpha, bfloat16 *a, BLASLONG lda,
   }
 
   BLASLONG iy = 0;
-  for (i = 0; i < m; i++) {
+  if (beta == 0) {
+    for (i = 0; i < m; i++) {
+      y[iy] = 0.;
+      iy += incy;
+    }
+  } else {
+    for (i = 0; i < m; i++) {
       y[iy] *= beta;
       iy += incy;
    }
+  }
 
   for (j = 0; j < n; j++) {
     x0 = alpha * vcvtah_f32_bf16(*x_ptr);