create a wrapper function for cblas_sgemm in javascript

To create a wrapper function for cblas_sgemm in JavaScript, you would need to use a library or module that provides access to the CBLAS functions. One such library is Emscripten, a toolchain for compiling C and C++ code to WebAssembly, which can be used from JavaScript.

Here is an example implementation of a wrapper function for cblas_sgemm in JavaScript, using Emscripten:


index.tsx
// Load Emscripten module
const module = await require("path/to/cblas_module.js")();

// Define wrapper function for cblas_sgemm
function cblas_sgemm(transA, transB, m, n, k, alpha, A, lda, B, ldb, beta, C, ldc) {
  const cblas = module.cwrap("cblas_sgemm", "void", ["number", "number", "number", "number", "number", "number", "number", "number", "number", "number", "number", "number", "number"]);
  const transA_ptr = module._malloc(Int8Array.BYTES_PER_ELEMENT);
  const transB_ptr = module._malloc(Int8Array.BYTES_PER_ELEMENT);
  const m_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);
  const n_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);
  const k_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);
  const alpha_ptr = module._malloc(Float32Array.BYTES_PER_ELEMENT);
  const A_ptr = module._malloc(Float32Array.BYTES_PER_ELEMENT * lda * k);
  const lda_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);
  const B_ptr = module._malloc(Float32Array.BYTES_PER_ELEMENT * ldb * n);
  const ldb_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);
  const beta_ptr = module._malloc(Float32Array.BYTES_PER_ELEMENT);
  const C_ptr = module._malloc(Float32Array.BYTES_PER_ELEMENT * ldc * n);
  const ldc_ptr = module._malloc(Int32Array.BYTES_PER_ELEMENT);

  module.setValue(transA_ptr, transA.charCodeAt(0), "i8");
  module.setValue(transB_ptr, transB.charCodeAt(0), "i8");
  module.setValue(m_ptr, m, "i32");
  module.setValue(n_ptr, n, "i32");
  module.setValue(k_ptr, k, "i32");
  module.setValue(alpha_ptr, alpha, "float");
  module.HEAPF32.set(A, A_ptr / Float32Array.BYTES_PER_ELEMENT);
  module.setValue(lda_ptr, lda, "i32");
  module.HEAPF32.set(B, B_ptr / Float32Array.BYTES_PER_ELEMENT);
  module.setValue(ldb_ptr, ldb, "i32");
  module.setValue(beta_ptr, beta, "float");
  module.HEAPF32.set(C, C_ptr / Float32Array.BYTES_PER_ELEMENT);
  module.setValue(ldc_ptr, ldc, "i32");

  cblas(transA_ptr, transB_ptr, m_ptr, n_ptr, k_ptr, alpha_ptr, A_ptr, lda_ptr, B_ptr, ldb_ptr, beta_ptr, C_ptr, ldc_ptr);

  const result = new Float32Array(C.length);
  result.set(module.HEAPF32.subarray(C_ptr / Float32Array.BYTES_PER_ELEMENT, (C_ptr + C.length * Float32Array.BYTES_PER_ELEMENT) / Float32Array.BYTES_PER_ELEMENT));

  module._free(transA_ptr);
  module._free(transB_ptr);
  module._free(m_ptr);
  module._free(n_ptr);
  module._free(k_ptr);
  module._free(alpha_ptr);
  module._free(A_ptr);
  module._free(lda_ptr);
  module._free(B_ptr);
  module._free(ldb_ptr);
  module._free(beta_ptr);
  module._free(C_ptr);
  module._free(ldc_ptr);

  return result;
}
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This implementation defines a function cblas_sgemm that takes the same arguments as cblas_sgemm, converts the arguments to the appropriate types for Emscripten, calls cblas_sgemm using the Emscripten module's cwrap function, and then converts the output matrix back to a JavaScript Float32Array.

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related categories

javascript

linear algebra

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wrapper function

cblas_sgemm