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Most cache friendly tiling of OpenCL image ?

Question asked by boxerab on Dec 18, 2014
Latest reply on Dec 22, 2014 by boxerab

I have an OpenCL image that is broken into tiles of 64x64 pixels. I am designing a kernel to run through all tiles and process the pixels. Target is AMD GCN.

Currently, I process the tiles in raster order: left to right, top to bottom.

Is there a better way of organizing the tiles to maximize use of image cache?

For example, I thought about clockwise strips, starting from the origin:


1  2  9 10

4  3  8 11

5  6  7 12

.   .  .  13



Any ideas?