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Nikita Popov 9fa93a3e70 [BasicAA] Always strip single-argument phi nodes 
We can always look through single-argument (LCSSA) phi nodes when
performing alias analysis. getUnderlyingObject() already does this,
but stripPointerCastsAndInvariantGroups() does not. We still look
through these phi nodes with the usual aliasPhi() logic, but
sometimes get sub-optimal results due to the restrictions on value
equivalence when looking through arbitrary phi nodes. I think it's
generally beneficial to keep the underlying object logic and the
pointer cast stripping logic in sync, insofar as it is possible.

With this patch we get marginally better results:

  aa.NumMayAlias | 5010069 | 5009861
  aa.NumMustAlias | 347518 | 347674
  aa.NumNoAlias | 27201336 | 27201528
  ...
  licm.NumPromoted | 1293 | 1296

I've renamed the relevant strip method to stripPointerCastsForAliasAnalysis(),
as we're past the point where we can explicitly spell out everything
that's getting stripped.

Differential Revision: https://reviews.llvm.org/D96668
2021-02-18 23:07:50 +01:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake [cmake] Move check for libproc to config-ix.cmake 2021-02-18 10:54:27 +01:00
docs Revert "[Coverage] Store compilation dir separately in coverage mapping" 2021-02-18 12:50:24 -08:00
examples [Draft] [examples] Move llvm/examples/OCaml-Kaleidoscope/ to llvm-archive 2021-02-11 06:52:24 +05:30
include [BasicAA] Always strip single-argument phi nodes 2021-02-18 23:07:50 +01:00
lib [BasicAA] Always strip single-argument phi nodes 2021-02-18 23:07:50 +01:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [CMake] Delete LLVM_RUNTIME_BUILD_ID_LINK_TARGETS 2021-02-15 11:06:23 -08:00
test [BasicAA] Always strip single-argument phi nodes 2021-02-18 23:07:50 +01:00
tools Revert "[Debugify] Make the debugify aware of the original (-g) Debug Info" 2021-02-18 02:04:27 -08:00
unittests Revert "[Coverage] Store compilation dir separately in coverage mapping" 2021-02-18 12:50:24 -08:00
utils [gn build] kind of merge f020544601 2021-02-18 16:12:32 -05:00
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CMakeLists.txt [cmake] Move check for libproc to config-ix.cmake 2021-02-18 10:54:27 +01:00
CODE_OWNERS.TXT Change XCore code owner. 2021-01-14 12:13:48 +00:00
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