From eaa348735ee5cee396f9ec629f1486ebb3dbeff7 Mon Sep 17 00:00:00 2001
From: Cedric Nugteren <web@cedricnugteren.nl>
Date: Sat, 16 Jul 2016 15:18:28 +0200
Subject: Created infrastructure to support a direct GEMM kernel; added correct
 but slow reference kernel as a place-holder

---
 src/kernels/level3/xgemm_direct.opencl | 71 ++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/kernels/level3/xgemm_direct.opencl

(limited to 'src/kernels/level3')

diff --git a/src/kernels/level3/xgemm_direct.opencl b/src/kernels/level3/xgemm_direct.opencl
new file mode 100644
index 00000000..9d2a55c8
--- /dev/null
+++ b/src/kernels/level3/xgemm_direct.opencl
@@ -0,0 +1,71 @@
+
+// =================================================================================================
+// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
+// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
+// width of 100 characters per line.
+//
+// Author(s):
+//   Cedric Nugteren <www.cedricnugteren.nl>
+//
+// This is a generic GEMM kernel that works for all sizes and configurations: it doesn't require any
+// pre and and post-processing kernels.
+//
+// =================================================================================================
+
+// Enables loading of this file using the C++ pre-processor's #include (C++11 standard raw string
+// literal). Comment-out this line for syntax-highlighting when developing.
+R"(
+
+// =================================================================================================
+
+// Main entry point of the kernel. This is the direct version.
+__attribute__((reqd_work_group_size(16, 16, 1)))
+__kernel void XgemmDirect(const int kSizeM, const int kSizeN, const int kSizeK,
+                          const real_arg arg_alpha,
+                          const real_arg arg_beta,
+                          const __global real* restrict agm, const int a_offset, const int a_ld,
+                          const __global real* restrict bgm, const int b_offset, const int b_ld,
+                          __global real* cgm, const int c_offset, const int c_ld,
+                          const int a_transpose, const int b_transpose, const int c_transpose,
+                          const int a_conjugate, const int b_conjugate) {
+  const real alpha = GetRealArg(arg_alpha);
+  const real beta = GetRealArg(arg_beta);
+
+  // Thread identifiers
+  const int mid = get_global_id(0); // Row ID of cgm
+  const int nid = get_global_id(1); // Col ID of cgm
+
+  // Allows for incomplete workgroups
+  if (mid < kSizeM && nid < kSizeN) {
+
+    // Computes a single element
+    real acc;
+    SetToZero(acc);
+    for (int k=0; k<kSizeK; ++k) {
+      const int a_index = (a_transpose) ? mid*a_ld + k : k*a_ld + mid;
+      const int b_index = (b_transpose) ? nid*b_ld + k : k*b_ld + nid;
+      real a_val = agm[a_index + a_offset];
+      real b_val = bgm[b_index + b_offset];
+      if (a_conjugate) { COMPLEX_CONJUGATE(a_val); }
+      if (b_conjugate) { COMPLEX_CONJUGATE(b_val); }
+      MultiplyAdd(acc, a_val, b_val);
+    }
+
+    // Determines the destination index
+    const int c_index = (c_transpose) ? mid*c_ld + nid : nid*c_ld + mid;
+
+    // Computes the result
+    real result;
+    AXPBY(result, alpha, acc, beta, cgm[c_index + c_offset]);
+
+    // Stores the result
+    cgm[c_index + c_offset] = result;
+  }
+}
+
+// =================================================================================================
+
+// End of the C++11 raw string literal
+)"
+
+// =================================================================================================
-- 
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