If you want to achieve something similar to _mm_stream_xxx, ie. bypassing the caches and causing bursts of DRAM traffic, try making some uncached/write combined memory mappings and writing to them. I don't know how this can be done in user space. You could try creating memory mapped buffers with OpenGL or Metal, with certain arguments you could get an uncached mapping.
Another option is looking at ARM instructions for memory barriers and cache flushes. ARM's selection of instructions for dealing with caches is much richer than x86's.
If you want to achieve something similar to _mm_stream_xxx, ie. bypassing the caches and causing bursts of DRAM traffic, try making some uncached/write combined memory mappings and writing to them. I don't know how this can be done in user space. You could try creating memory mapped buffers with OpenGL or Metal, with certain arguments you could get an uncached mapping.
Another option is looking at ARM instructions for memory barriers and cache flushes. ARM's selection of instructions for dealing with caches is much richer than x86's.