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enginex-ascend-910-llama.cpp/ggml/src/ggml-vulkan/vulkan-shaders/utils.comp
Jeff Bolz 1fe00296f5 vulkan: fuse adds (#15252)
* vulkan: fuse adds

Fuse adds that have the same shape, which are common in MoE models.
It will currently fuse up to 6 adds, because we assume no more than
8 descriptors per dispatch. But this could be changed.

* check runtimeDescriptorArray feature

* disable multi_add for Intel due to likely driver bug
2025-08-16 11:48:22 -05:00

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#ifndef UTILS_COMP
#define UTILS_COMP
// mod and div are expensive and coordinates/dimensions are often power of 2 or equal to 1
uint fastmod(uint a, uint b) {
if ((b & (b-1)) == 0) {
return a & (b-1);
}
return a % b;
}
uint fastdiv(uint a, uint b) {
return (a < b) ? 0 : (a / b);
}
void get_indices(uint idx, out uint i00, out uint i01, out uint i02, out uint i03, uint ne00, uint ne01, uint ne02, uint ne03) {
i03 = fastdiv(idx, (ne02*ne01*ne00));
const uint i03_offset = i03 * ne02*ne01*ne00;
i02 = fastdiv((idx - i03_offset), (ne01*ne00));
const uint i02_offset = i02*ne01*ne00;
i01 = (idx - i03_offset - i02_offset) / ne00;
i00 = idx - i03_offset - i02_offset - i01*ne00;
}
#endif // UTILS_COMP