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Workaround for subgroup arithmetic failing on MoltenVK with AMD GPUs #15886

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Merged
merged 1 commit into from
Sep 9, 2025
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Workaround for subgroup arithmetic failing on MoltenVK with AMD GPUs #15886

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6 changes: 6 additions & 0 deletions ggml/src/ggml-vulkan/ggml-vulkan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3736,6 +3736,12 @@ static vk_device ggml_vk_get_device(size_t idx) {

device->subgroup_arithmetic = (vk11_props.subgroupSupportedStages & vk::ShaderStageFlagBits::eCompute) &&
(vk11_props.subgroupSupportedOperations & vk::SubgroupFeatureFlagBits::eArithmetic);
#ifdef __APPLE__
// Workaround for subgroup arithmetic failing on MoltenVK with AMD GPUs (issue 15846)
if (device->vendor_id == VK_VENDOR_ID_AMD) {
device->subgroup_arithmetic = false;
}
#endif
device->subgroup_shuffle = (vk11_props.subgroupSupportedStages & vk::ShaderStageFlagBits::eCompute) &&
(vk11_props.subgroupSupportedOperations & vk::SubgroupFeatureFlagBits::eShuffle);
device->subgroup_clustered = (vk11_props.subgroupSupportedStages & vk::ShaderStageFlagBits::eCompute) &&
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