https://github.com/JuliaLang/julia
This is a bit of a tricky one. What happens here is that IncrementalCompact finds that one branch of an if/else is dead, so one of the incoming values of the PhiNode goes away. This may have the effect of narrowing the type of the PhiNode (if the branches have different types). In the latest iteration of our compiler, such situations need to be annotated with IR_FLAG_REFINED or `Refined()`, otherwise irinterp will skip them on revisit. In theory, the fix is quite simple: Check whether the type is being refined and if so, set the flag. However, this code sits inside IncrementalCompcat, which currently neither performs lattice operations nor sets any Refined flags by itself. The three possible options here are: 1. Thread lattice through IncrementalCompact. 2. Use an egal check inside IncrementalCompact rather than the proper lattice query. This is legal, but may overapproximate the need for `Refined`, thus causing unnecessary work later. 3. Move the phi node narrowing outside of IncrementalCompact. This PR takes a hybrid approach of 2 and 3. Approach 1 is undesirable, because we do not want to recompile all of IncrementalCompact for every lattice, just for this one query. I almost took approach 2, but it is unsatisfying, because of the imprecision, which could cuase a lot of extra work in pathological cases. The primary downside of approach 3 is that now every pass that performs IncrementalCompact with CFG manipulation enabled will need to call the `reprocess_phi_node!` helper. We have two of these in base (adce_pass! and `compact!(..., true)` although only the former as access to a lattice. The compromise I came up with here is to do the egality check, except leaving the PhiNode in place when it fails rather than setting `Refined` internally. I think this is ok. There's a bit of an issue with duplicate work, because the first thing that the lattice check will do is check for equality, but that only happens in the case where a refinement actually is required, which is both rarer and profitable. Finally, I'm pretty sure I've found this issue before, but I cannot find any writeup on it, so if somebody remembers me writing it up somewhere, please let me know so I can add appropriate cross references. --------- Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>
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CONTRIBUTING.md | -rw-r--r-- | 23.4 KB |
HISTORY.md | -rw-r--r-- | 388.0 KB |
LICENSE.md | -rw-r--r-- | 1.3 KB |
Make.inc | -rw-r--r-- | 56.4 KB |
Makefile | -rw-r--r-- | 30.4 KB |
NEWS.md | -rw-r--r-- | 4.4 KB |
README.md | -rw-r--r-- | 7.4 KB |
THIRDPARTY.md | -rw-r--r-- | 3.9 KB |
VERSION | -rw-r--r-- | 11 bytes |
julia.spdx.json | -rw-r--r-- | 37.8 KB |
pkgimage.mk | -rw-r--r-- | 1.4 KB |
sysimage.mk | -rw-r--r-- | 4.2 KB |
typos.toml | -rw-r--r-- | 78 bytes |
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