test built-in function "nextafter"

Signed-off-by: Homer Hsing <homer.xing@intel.com>
Tested-by: Zhigang Gong <zhigang.gong@linux.intel.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/utests/builtin_nextafter.cpp b/utests/builtin_nextafter.cpp
new file mode 100644
index 00000000..ae954974
--- /dev/null
+++ b/utests/builtin_nextafter.cpp
@@ -0,0 +1,60 @@
+#include <cmath>
+#include <cstring>
+#include "utest_helper.hpp"
+
+static int as_int(float f) {
+  void *p = &f;
+  return *(int *)p;
+}
+
+void builtin_nextafter(void)
+{
+  const int n = 16;
+  float src1[n], src2[n];
+
+  // Setup kernel and buffers
+  OCL_CREATE_KERNEL("builtin_nextafter");
+  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_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]);
+  globals[0] = n;
+  locals[0] = 16;
+
+  src1[0] = nanf(""), src2[0] = 1.1f;
+  src1[1] = 2.2f,     src2[1] = nanf("");
+  src1[2] = nanf(""), src2[2] = nanf("");
+  src1[3] = 123.4f,   src2[3] = 123.4f;
+  src1[4] = 0.f,      src2[4] = 1.f;
+  src1[5] = -0.f,     src2[5] = -1.f;
+  for (int i = 6; i < n; ++i) {
+    src1[i] = (rand() & 255) * 0.1f - 12.8f;
+    src2[i] = (rand() & 255) * 0.1f - 12.8f;
+  }
+
+  OCL_MAP_BUFFER(0);
+  OCL_MAP_BUFFER(1);
+  memcpy(buf_data[0], src1, n * sizeof(float));
+  memcpy(buf_data[1], src2, n * sizeof(float));
+  OCL_UNMAP_BUFFER(0);
+  OCL_UNMAP_BUFFER(1);
+
+  OCL_NDRANGE(1);
+
+  OCL_MAP_BUFFER(2);
+  float *dest = (float *)buf_data[2];
+  if (0)
+    for (int i = 0; i < n; ++i)
+      printf("%d %x %x %x %x\n", i, as_int(src1[i]), as_int(src2[i]),
+             as_int(dest[i]), as_int(nextafterf(src1[i], src2[i])));
+  OCL_ASSERT(isnanf(dest[0]));
+  OCL_ASSERT(isnanf(dest[1]));
+  OCL_ASSERT(isnanf(dest[2]));
+  for (int i = 3; i < n; ++i)
+    OCL_ASSERT(dest[i] == nextafterf(src1[i], src2[i]));
+  OCL_UNMAP_BUFFER(2);
+}
+
+MAKE_UTEST_FROM_FUNCTION(builtin_nextafter);