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| author | Florian Hahn <flo@fhahn.com> | 2025-07-25 15:29:40 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2025-07-25 15:29:40 +0100 |
| commit | e21ee41be450f849f5247aafa07d7f4c3941bb9d (patch) | |
| tree | 40471ca110ce19d73cb2b0e1288cbed94f3a881e /llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp | |
| parent | e4963834e44b2d41d1d6bce0c7c585a4c0b7bf86 (diff) | |
| download | llvm-e21ee41be450f849f5247aafa07d7f4c3941bb9d.zip llvm-e21ee41be450f849f5247aafa07d7f4c3941bb9d.tar.gz llvm-e21ee41be450f849f5247aafa07d7f4c3941bb9d.tar.bz2 | |
[SCEV] Try to re-use pointer LCSSA phis when expanding SCEVs. (#147824)
Generalize the code added in
https://github.com/llvm/llvm-project/pull/147214 to also support
re-using pointer LCSSA phis when expanding SCEVs with AddRecs.
A common source of integer AddRecs with pointer bases are runtime checks
emitted by LV based on the distance between 2 pointer AddRecs.
This improves codegen in some cases when vectorizing and prevents
regressions with https://github.com/llvm/llvm-project/pull/142309, which
turns some phis into single-entry ones, which SCEV will look through
now (and expand the whole AddRec), whereas before it would have to treat
the LCSSA phi as SCEVUnknown.
Compile-time impact neutral:
https://llvm-compile-time-tracker.com/compare.php?from=fd5fc76c91538871771be2c3be2ca3a5f2dcac31&to=ca5fc2b3d8e6efc09f1624a17fdbfbe909f14eb4&stat=instructions:u
PR: https://github.com/llvm/llvm-project/pull/147824
Diffstat (limited to 'llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp')
0 files changed, 0 insertions, 0 deletions