Add convert_uchar_sat and test case

'convert_uchar_sat' converts float to uchar saturately.
'convert_uchar_sat' simply calls add_sat.
by 'convert_uchar_sat' function we don't need to clamp(value, 0, 255).
we also add a test case.

Signed-off-by: Homer Hsing <homer.xing@intel.com>
Reviewed-by: Lu Guanqun <guanqun.lu@intel.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/utests/compiler_convert_uchar_sat.cpp b/utests/compiler_convert_uchar_sat.cpp
new file mode 100644
index 00000000..da000417
--- /dev/null
+++ b/utests/compiler_convert_uchar_sat.cpp
@@ -0,0 +1,44 @@
+#include "utest_helper.hpp"
+
+static void cpu(int global_id, float *src, int *dst) {
+  float f = src[global_id];
+  dst[global_id] = f > 255 ? 255 : f < 0 ? 0 : f;
+}
+
+void compiler_convert_uchar_sat(void)
+{
+  const size_t n = 16;
+  float cpu_src[16];
+  int cpu_dst[16];
+
+  // Setup kernel and buffers
+  OCL_CREATE_KERNEL("compiler_convert_uchar_sat");
+  OCL_CREATE_BUFFER(buf[0], 0, n * sizeof(float), NULL);
+  OCL_CREATE_BUFFER(buf[1], 0, n * sizeof(int), NULL);
+  OCL_SET_ARG(0, sizeof(cl_mem), &buf[0]);
+  OCL_SET_ARG(1, sizeof(cl_mem), &buf[1]);
+  globals[0] = 16;
+  locals[0] = 16;
+
+  // Run random tests
+  for (uint32_t pass = 0; pass < 8; ++pass) {
+    OCL_MAP_BUFFER(0);
+    for (int32_t i = 0; i < (int32_t) n; ++i)
+      cpu_src[i] = ((float*)buf_data[0])[i] = (rand() & 1023) / 2;
+    OCL_UNMAP_BUFFER(0);
+
+    // Run the kernel on GPU
+    OCL_NDRANGE(1);
+
+    // Run on CPU
+    for (int32_t i = 0; i < (int32_t) n; ++i) cpu(i, cpu_src, cpu_dst);
+
+    // Compare
+    OCL_MAP_BUFFER(1);
+    for (int32_t i = 0; i < (int32_t) n; ++i)
+      OCL_ASSERT(((int *)buf_data[1])[i] == cpu_dst[i]);
+    OCL_UNMAP_BUFFER(1);
+  }
+}
+
+MAKE_UTEST_FROM_FUNCTION(compiler_convert_uchar_sat);