From: Jeff Bolz <redacted>
Date: Tue, 24 Feb 2026 06:48:32 +0000 (-0600)
Subject: vulkan: fix coopmat1 without bf16 support (llama/19793)
X-Git-Tag: v0.9.8~110
X-Git-Url: https://git.djapps.eu/?a=commitdiff_plain;h=e7ba2a81251a6c1ce03ba9b14f0fb901d2bdc25a;p=pkg%2Fggml%2Fsources%2Fggml

vulkan: fix coopmat1 without bf16 support (llama/19793)
---

diff --git a/src/ggml-vulkan/ggml-vulkan.cpp b/src/ggml-vulkan/ggml-vulkan.cpp
index a8840a07..88b3e4e5 100644
--- a/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/src/ggml-vulkan/ggml-vulkan.cpp
@@ -3780,10 +3780,12 @@ static void ggml_vk_load_shaders(vk_device& device) {
         && !device->coopmat_bf16_support
 #endif
         ) {
+        const uint32_t s_warptile_wm = device->subgroup_size == 8 ? 8 : 32;
+
         // use scalar tile sizes
         l_warptile = { 128, 128, 128, 16, subgroup_size_8 * 2, 64, 2, 4, 4, 1, subgroup_size_8 };
         m_warptile = { 128,  64,  64, 16, subgroup_size_8, 32, 2, 4, 2, 1, subgroup_size_8 };
-        s_warptile = { subgroup_size_16, 32, 32, 16, 32, 32, 2, 2, 2, 1, subgroup_size_8 };
+        s_warptile = { subgroup_size_32, 32, 32, 16, s_warptile_wm, 32, 2, 2, 2, 1, subgroup_size_8 };
 
         l_wg_denoms = {128, 128, 1 };
         m_wg_denoms = { 64,  64, 1 };