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

opencl/tests/ocltst/module/runtime/OCLLDS32K.cpp

@@ -30,12 +30,17 @@
 #include <CL/cl.h>
 
 typedef unsigned int uint32_t;
-
+#if EMU_ENV
+#define LDS_SIZE 1024
+#define A_SIZE 1024
+#else
 #define LDS_SIZE 32768
+#define A_SIZE (8 * 1024 * 1024)
+#endif  // EMU_ENV
+
 #define LOCAL_WORK_SIZE 64
 
 // We'll do a 64MB transaction
-#define A_SIZE (8 * 1024 * 1024)
 #define B_SIZE A_SIZE
 #define C_SIZE A_SIZE
 #define D_SIZE A_SIZE
@@ -46,6 +51,36 @@ typedef unsigned int uint32_t;
 
 // 32K has 8192 elements
 // 64 threads each handle 8192/64=128 values
+#if EMU_ENV
+static const char program_source[] = KERNEL(
+    __kernel void the_kernel(__global const uint *a, __global const uint *b,
+                             __global const uint *c, __global uint *d,
+                             __global uint *e) {
+  // Reduce size for the emulator
+  __local uint lds[256];
+  uint gid = get_global_id(0);
+  __global const uint* ta = a + 4 * gid;
+  __global const uint* tb = b + 4 * gid;
+  __global const uint* tc = c + 4 * gid;
+  __global uint* td = d + 4 * gid;
+  uint i;
+
+  for (i = 0; i < 4; ++i) lds[ta[i]] = tc[i];
+
+  barrier(CLK_LOCAL_MEM_FENCE);
+
+  for (i = 0; i < 4; ++i) td[i] = lds[tb[i]];
+} __kernel void the_kernel2(__global uint* d) {
+      __local uint lds[8192];
+      uint i;
+      uint gid = get_global_id(0);
+
+      for (i = 0; i < 128; ++i) lds[i] = d[gid];
+      barrier(CLK_LOCAL_MEM_FENCE);
+
+      for (i = 0; i < 128; ++i) d[gid] = lds[i];
+    });
+#else
 static const char program_source[] = KERNEL(
     __kernel void the_kernel(__global const uint *a, __global const uint *b,
                              __global const uint *c, __global uint *d,
@@ -73,6 +108,7 @@ static const char program_source[] = KERNEL(
 
       for (i = 0; i < 128; ++i) d[gid] = lds[i];
     });
+#endif  // EMU_ENV
 
 static void fill(uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d,
                  uint32_t *e) {