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numcyclesforstoreloadthroughmemory
2015 Jun 12
4
[LLVMdev] Loop Vectorization and Store-Load Forwarding issue
I have been looking into this small test case (Part A) where loop vectorization is disabled due to possible store-load forwarding conflict (Part B). As you can see, due to the presence of dependence distance 2 the loop is vectorizable only for a width of 2. However, the presence of dependence distance 15 (due to y[j-15]) results in store-load forwarding issue as store packet of y[16:17] (iteration