From 6d1e30e61f5ef73f0a83e12f064cae64644034ca Mon Sep 17 00:00:00 2001
From: Cedric Nugteren <web@cedricnugteren.nl>
Date: Thu, 28 Dec 2017 14:46:45 +0100
Subject: Added interface to compute the required temporary buffer size for
 GEMM

---
 src/clblast.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

(limited to 'src/clblast.cpp')

diff --git a/src/clblast.cpp b/src/clblast.cpp
index 7d2c2cef..e38a75ca 100644
--- a/src/clblast.cpp
+++ b/src/clblast.cpp
@@ -2332,5 +2332,58 @@ template StatusCode PUBLIC_API GemmBatched<half>(const Layout, const Transpose,
                                                  const size_t,
                                                  cl_command_queue*, cl_event*);
 
+// =================================================================================================
+
+// Retrieves the required size of the temporary buffer for the GEMM kernel (optional)
+template <typename T>
+StatusCode GemmTempBufferSize(const Layout layout, const Transpose a_transpose, const Transpose b_transpose,
+                              const size_t m, const size_t n, const size_t k,
+                              const size_t a_offset, const size_t a_ld,
+                              const size_t b_offset, const size_t b_ld,
+                              const size_t c_offset, const size_t c_ld,
+                              RawCommandQueue* queue, size_t& temp_buffer_size) {
+  try {
+
+    // Retrieves the tuning database
+    const auto queue_cpp = Queue(*queue);
+    const auto device = queue_cpp.GetDevice();
+    const auto kernel_names = std::vector<std::string>{"Xgemm", "GemmRoutine"};
+    Databases db(kernel_names);
+    Routine::InitDatabase(device, kernel_names, PrecisionValue<T>(), {}, db);
+
+    // Computes the buffer size
+    if (Xgemm<T>::UseDirectKernel(m, n, k, db["XGEMM_MIN_INDIRECT_SIZE"])) {
+      temp_buffer_size = 0;
+    }
+    else {
+      temp_buffer_size = Xgemm<T>::GetTempSize(layout, a_transpose, b_transpose, m, n, k,
+                                               a_offset, a_ld, b_offset, b_ld, c_offset, c_ld,
+                                               db["MWG"], db["NWG"], db["KWG"]);
+    }
+    temp_buffer_size *= sizeof(T); // translate from num-elements to bytes
+    return StatusCode::kSuccess;
+  } catch (...) { return DispatchException(); }
+}
+template StatusCode PUBLIC_API GemmTempBufferSize<float>(const Layout, const Transpose, const Transpose,
+                                                         const size_t, const size_t, const size_t,
+                                                         const size_t, const size_t, const size_t, const size_t,
+                                                         const size_t, const size_t, RawCommandQueue*, size_t&);
+template StatusCode PUBLIC_API GemmTempBufferSize<double>(const Layout, const Transpose, const Transpose,
+                                                          const size_t, const size_t, const size_t,
+                                                          const size_t, const size_t, const size_t, const size_t,
+                                                          const size_t, const size_t, RawCommandQueue*, size_t&);
+template StatusCode PUBLIC_API GemmTempBufferSize<float2>(const Layout, const Transpose, const Transpose,
+                                                          const size_t, const size_t, const size_t,
+                                                          const size_t, const size_t, const size_t, const size_t,
+                                                          const size_t, const size_t, RawCommandQueue*, size_t&);
+template StatusCode PUBLIC_API GemmTempBufferSize<double2>(const Layout, const Transpose, const Transpose,
+                                                           const size_t, const size_t, const size_t,
+                                                           const size_t, const size_t, const size_t, const size_t,
+                                                           const size_t, const size_t, RawCommandQueue*, size_t&);
+template StatusCode PUBLIC_API GemmTempBufferSize<half>(const Layout, const Transpose, const Transpose,
+                                                        const size_t, const size_t, const size_t,
+                                                        const size_t, const size_t, const size_t, const size_t,
+                                                        const size_t, const size_t, RawCommandQueue*, size_t&);
+
 // =================================================================================================
 } // namespace clblast
-- 
cgit v1.2.3