Current debug output from -fprefetch-loop-arrays refers to prefetching instances by their (void *) address, which makes it painful to compare dumps, e.g., when investigating how different parameter values affect prefetching decisions.
This patch adds UIDs to two main prefetching concepts: mem_ref_group and mem_ref. [Mem_refs are combined into mem_ref_groups so that they can re-use prefetches.] Debug output is then changed to identify prefetch opportunities as <group>:<ref> instead of 0xNNNNNNNN. Believe me, it makes a world of difference for debugging tree-ssa-loop-prefetch.c. There is no change in code-generation from this patch. Bootstrapped and regtested on x86_64-linux-gnu and aarch64-linux-gnu. -- Maxim Kuvyrkov www.linaro.org
0002-Improve-debug-output-of-loop-data-prefetching.patch
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