I have some old numbers from late April. VRP vs ranger was more difficult to compare than evrp, since the gimple is different (ASSERT_EXPRs). What I did was run a late evrp pass before each VRP pass and compared branches that were folded, for an estimate.
On it's own VRP1 could fold 5482 branches versus 6338 for a late evrp pass running before VRP1, so 15% more. If late evrp runs before VRP1, VRP1 can find something late evrp can't in 77 out of 388 .ii files distilled from a bootstrap. So, VRP1 can fold a branch in 1 out of 5 files. For VRP2, the numbers are 376 branches on its own versus 467 for late evrp2. That's 24% more branches for late evrp2. VRP2 can find something late evrp2 can't in 199 out of 388 files, so one in every 2 files. I didn't dig deep into the VRP[12] foldable branches. Some of them looked like duplicates, and others looked like stuff we could get with minor tweaks with range-ops. But I really don't have hard data here. And yes, I agree, we should re-run these stats when the dust settles in the next week or two. Aldy
