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One thing I find curious still is tree-vn usage:
tree-vn.c:69 (make_value_handle) 3605256: 1.6% 0: 0.0% 0: 0.0% 400584: 1.3% 50073 to: tree-vn.c:69 (make_value_handle) 3738816: 1.6% 0: 0.0% 0: 0.0% 415424: 1.3% 51928
I don't see directly how your patch can affect number of value nodes, but it might be just some instability of optimizers.
if (listchanged) vn_lookup_or_add (newarglist, NULL);
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