In GPU programming (CUDA for example), every time you allocate memory you need to explicitly specify where (general memory, L3, L2, L1, register). Because C doe

In GPU programming (CUDA for example), every time you allocate memory you need to explicitly specify where (general memory, L3, L2, L1, register). Because C doesn't support this, they added language extensions. So C is too high level for GPU programming, and needed to be extended.