[Beignet] [PATCH V2 2/2] utests: add an utest for mix

[Pan Xiuli]

Add a testcase for compiler mix. Since mix will have
error, we take err limit as 1e-3 and print the max err.

Signed-off-by: Pan Xiuli <xiuli.pan at intel.com>
---
 kernels/compiler_mix.cl |  4 ++++
 utests/CMakeLists.txt   |  3 ++-
 utests/compiler_mix.cpp | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 kernels/compiler_mix.cl
 create mode 100644 utests/compiler_mix.cpp

diff --git a/kernels/compiler_mix.cl b/kernels/compiler_mix.cl
new file mode 100644
index 0000000..2164b81
--- /dev/null
+++ b/kernels/compiler_mix.cl
@@ -0,0 +1,4 @@
+kernel void compiler_mix(global float *src1, global float *src2, global float *src3, global float *dst) {
+  int i = get_global_id(0);
+  dst[i] = mix(src1[i], src2[i], src3[i]);
+}
diff --git a/utests/CMakeLists.txt b/utests/CMakeLists.txt
index b26f4d0..89dbe91 100644
--- a/utests/CMakeLists.txt
+++ b/utests/CMakeLists.txt
@@ -216,7 +216,8 @@ set (utests_sources
   runtime_use_host_ptr_image.cpp
   compiler_get_sub_group_size.cpp
   compiler_get_sub_group_id.cpp
-  compiler_sub_group_shuffle.cpp)
+  compiler_sub_group_shuffle.cpp
+  compiler_mix.cpp)
 
 if (LLVM_VERSION_NODOT VERSION_GREATER 34)
   SET(utests_sources
diff --git a/utests/compiler_mix.cpp b/utests/compiler_mix.cpp
new file mode 100644
index 0000000..f1ddde0
--- /dev/null
+++ b/utests/compiler_mix.cpp
@@ -0,0 +1,50 @@
+#include "utest_helper.hpp"
+#include <cmath>
+void compiler_mix(void)
+{
+  const float MAXERR = 1e-3f;
+  const int n = 1024;
+  float src1[n], src2[n], src3[n];
+
+  // Setup kernel and buffers
+  OCL_CREATE_KERNEL("compiler_mix");
+  OCL_CREATE_BUFFER(buf[0], 0, n * sizeof(float), NULL);
+  OCL_CREATE_BUFFER(buf[1], 0, n * sizeof(float), NULL);
+  OCL_CREATE_BUFFER(buf[2], 0, n * sizeof(float), NULL);
+  OCL_CREATE_BUFFER(buf[3], 0, n * sizeof(float), NULL);
+  OCL_SET_ARG(0, sizeof(cl_mem), &buf[0]);
+  OCL_SET_ARG(1, sizeof(cl_mem), &buf[1]);
+  OCL_SET_ARG(2, sizeof(cl_mem), &buf[2]);
+  OCL_SET_ARG(3, sizeof(cl_mem), &buf[3]);
+  globals[0] = n;
+  locals[0] = 16;
+
+  OCL_MAP_BUFFER(0);
+  OCL_MAP_BUFFER(1);
+  OCL_MAP_BUFFER(2);
+  for (int i = 0; i < n; ++i) {
+    src1[i] = ((float*)buf_data[0])[i] = (float)rand();
+    src2[i] = ((float*)buf_data[1])[i] = (float)rand();
+    src3[i] = ((float*)buf_data[2])[i] = (float)rand()/(float)RAND_MAX;
+  }
+  OCL_UNMAP_BUFFER(0);
+  OCL_UNMAP_BUFFER(1);
+  OCL_UNMAP_BUFFER(2);
+
+  OCL_NDRANGE(1);
+
+  OCL_MAP_BUFFER(3);
+  float res, err;
+  float max_err = 0.0f;
+  for (int i = 0; i < n; ++i)
+  {
+    res = src1[i] + ((src2[i] - src1[i]) * src3[i]);
+    err = fabsf((((float*)buf_data[3])[i] - res)/ res);
+    max_err = err > max_err? err: max_err;
+  }
+  OCL_UNMAP_BUFFER(3);
+  printf("\tmix max err is %g\n",max_err);
+  OCL_ASSERT(max_err < MAXERR);
+}
+
+MAKE_UTEST_FROM_FUNCTION(compiler_mix);
-- 
2.1.4