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ggml-webgpu: add fast mat-mat path for i-quants #22504

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Merged
reeselevine merged 1 commit into from
Apr 30, 2026
+443 −1
Merged

ggml-webgpu: add fast mat-mat path for i-quants #22504

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19 changes: 19 additions & 0 deletions ggml/src/ggml-webgpu/ggml-webgpu-shader-lib.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1797,6 +1797,25 @@ class ggml_webgpu_shader_lib {
defines.push_back("U32_DEQUANT_HELPERS");
defines.push_back("SRC0_INNER_TYPE=u32");

switch (context.src0->type) {
case GGML_TYPE_IQ1_S:
case GGML_TYPE_IQ1_M:
case GGML_TYPE_IQ4_NL:
case GGML_TYPE_IQ4_XS:
defines.push_back(type_upper + "_GRID");
break;
case GGML_TYPE_IQ2_XXS:
case GGML_TYPE_IQ2_XS:
case GGML_TYPE_IQ2_S:
case GGML_TYPE_IQ3_XXS:
case GGML_TYPE_IQ3_S:
defines.push_back(type_upper + "_GRID");
defines.push_back(type_upper + "_TABLES");
break;
default:
break;
}

variant += std::string("_") + src0_name;
break;
}
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2 changes: 1 addition & 1 deletion ggml/src/ggml-webgpu/ggml-webgpu.cpp
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Expand Up @@ -1422,7 +1422,7 @@ static webgpu_encoded_op ggml_webgpu_mul_mat(webgpu_context & ctx,
case GGML_TYPE_IQ3_S:
case GGML_TYPE_IQ4_NL:
case GGML_TYPE_IQ4_XS:
use_fast = is_vec;
use_fast = true;
break;
default:
break;
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