SWDEV-1 - Add EMU_ENV option

Fix FEAT-39125
Add EMU_ENV option. If it is ON, the building is for
emulation environment, thus some logics can be adjusted
to match emulation environment. If it is OFF, the
building is for regular environment.
Currently only ocltst will use the option. But it can
be used for other modules.

Change-Id: I54e1bc1309e82794b41fca2ae1f01f004138dced


[ROCm/clr commit: 76c6dcd558]

projects/clr/opencl/tests/ocltst/module/runtime/OCLMemoryInfo.cpp

@@ -83,8 +83,11 @@ void OCLMemoryInfo::run(void) {
   if (failed_) {
     return;
   }
-
+#if EMU_ENV
+  size_t BufSize = 0x10000;
+#else
   size_t BufSize = 0x1000000;
+#endif  // EMU_ENV
   bool succeed = false;
   bool done = false;
   if (test_ == 0) {
@@ -166,12 +169,19 @@ void OCLMemoryInfo::run(void) {
         _wrapper->clGetDeviceInfo(devices_[_deviceId],
                                   CL_DEVICE_GLOBAL_FREE_MEMORY_AMD,
                                   2 * sizeof(size_t), memoryInfo2, NULL);
+#if EMU_ENV
+        // For testing on emulator with 2G RAM and buffer size of x10000
+        if (memoryInfo2[0] < (0x3e000 + (BufSize * sizeof(cl_int4) / 1024))) {
+#else
         if (memoryInfo2[0] < (0x50000 + (BufSize * sizeof(cl_int4) / 1024))) {
+#endif  // EMU_ENV
           break;
         }
         size_t dif = memoryInfo[0] - memoryInfo2[0];
         // extra memory could be allocated/destroyed in the driver
-        if ((dif / sizeAll) == 1 || (sizeAll / dif) == 1) {
+        if (dif == 0) {
+          // the buffer memory may come from the cached memory pool
+        } else if ((dif / sizeAll) == 1 || (sizeAll / dif) == 1) {
           succeed = true;
         } else {
           succeed = false;