Miscompile with a kernel with id-dependent computation before exit and also early exit

[Pekka Jääskeläinen]

These curious cases keep popping up ;)

"kernel \n"
"void test_kernel(__global float *input, \n"
" __global int *result) {\n"
" size_t gid = get_global_id(0);\n"
" if (input[0] > 2) return;\n"
" result[gid] = 0;\n"
" barrier(CLK_GLOBAL_MEM_FENCE);\n"
" result[gid] += input[gid];\n"
" if (gid == 0) {\n"
" result[gid] = 42;\n"
" }\n"
"}\n";

Produces:
F(1: 42 != 1)

While only gid == 0 should have '42' so the if is always executed.

Hard to say what is the actual cause of this case but at least it has 3 entries to the exit node and there is thread id dependent computation in the last block so it can be related to the tail replication somehow.