From dadbed99e65252d79f81101a392d0d6497b86caa Mon Sep 17 00:00:00 2001
From: Shouzheng Liu <lshzh.hi@gmail.com>
Date: Mon, 21 Aug 2023 06:59:29 -0400
Subject: [PATCH] metal : fix synchronization in new matrix multiplication
 kernel (#2686)

---
 ggml-metal.metal | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ggml-metal.metal b/ggml-metal.metal
index 3f3125236f197..88d48f6c6a2eb 100644
--- a/ggml-metal.metal
+++ b/ggml-metal.metal
@@ -1898,10 +1898,11 @@ kernel void kernel_mul_mm(device const  uchar * src0,
         threadgroup float *temp_str = ((threadgroup float *)shared_memory) \
                                       + 32 * (sgitg&1) + (16 * (sgitg>>1)) * BLOCK_SIZE_M;
         for (int i = 0; i < 8; i++) {
+            threadgroup_barrier(mem_flags::mem_device);
             simdgroup_store(c_res[i], temp_str + 8 * (i%4) + 8 * BLOCK_SIZE_M * (i/4), BLOCK_SIZE_M);
         }
 
-        threadgroup_barrier(mem_flags::mem_threadgroup);
+        threadgroup_barrier(mem_flags::mem_device);
         device float *C = dst + BLOCK_SIZE_M * r0 + (BLOCK_SIZE_N * r1) * ne0 + im*ne1*ne0;
         if (sgitg==0) {
             for (int i = 0; i < n_rows; i++) {