CODEWITHSUNDEEP
c++cudagpu-shared-memory
diver_182
diver_182

Reputation: 261

How to use volatile with 2D shared memory?

I was wondering how to declare a volatile pointer to two dimensional shared memory and if this would have the same effect as for one dimensional arrays.

__shared__ float 2d_array[32][32];
// not working: volatile T ** smem = sdata;

Upvotes: 1

Views: 453

Answers (1)

talonmies
talonmies

Reputation: 72349

Note that your "two dimensional" shared memory array is, in fact, only one dimensional. So something like this:

__shared__ volatile float array_2d[32][32]; 
volatile float *smem = &array_2d[0][0]; 
float val = *(smem + y + 32*x) // address of s2_array[x][y]

is what you want. The static array array_2d is stored in row major order and can be accessed as I have shown.

Upvotes: 3

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