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Nikita Popov d9de690aaf [BasicAA] Make sure context instruction is symmetric
D71264 started using a context instruction in a computeKnownBits()
call. However, if aliasing between two GEPs is checked, then the
choice of context instruction will be different for alias(GEP1, GEP2)
and alias(GEP2, GEP1), which is not supposed to happen.

Resolve this by remembering which GEP a certain VarIndex belongs to,
and use that as the context instruction. This makes the choice of
context instruction predictable and symmetric.

It should be noted that this choice of context instruction is
non-optimal (just like the previous choice): The AA query result is
only valid at points that are reachable from *both* instructions.
Using either one of them is conservatively correct, but a larger
context may also be valid to use.

Differential Revision: https://reviews.llvm.org/D93183
2020-12-25 11:35:46 +01:00
benchmarks
bindings [Go] Fix bindings/go/llvm/IRBindings.cpp 2020-12-16 10:09:58 -08:00
cmake [CMake] Avoid __FakeVCSRevision.h with no git repository 2020-12-16 17:33:20 +01:00
docs [AMDGPU] Use MUBUF instructions for global address space access 2020-12-24 10:13:04 +00:00
examples [NFC] Reduce include files dependency and AA header cleanup (part 2). 2020-12-17 14:04:48 +03:00
include [BasicAA] Make sure context instruction is symmetric 2020-12-25 11:35:46 +01:00
lib [BasicAA] Make sure context instruction is symmetric 2020-12-25 11:35:46 +01:00
projects llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
resources
runtimes [OpenMP] Fixed the issue that CMake variables for OpenMP were not passed through when building OpenMP with LLVM_ENABLE_RUNTIMES 2020-12-20 18:40:12 -05:00
test [BasicAA] Make sure context instruction is symmetric 2020-12-25 11:35:46 +01:00
tools [obj2yaml] - Dump the content of a broken hash table properly. 2020-12-25 11:51:28 +03:00
unittests [Support] Add KnownBits::getSignedMinValue/getSignedMaxValue helpers. 2020-12-24 14:10:12 +00:00
utils clang: Build and run FrontendTests with CLANG_ENABLE_STATIC_ANALYZER=OFF too 2020-12-23 14:27:09 -05:00
.clang-format
.clang-tidy
.gitattributes
.gitignore
CMakeLists.txt Remove Python2 fallback and only advertise Python3 in the doc 2020-12-17 15:40:16 +01:00
CODE_OWNERS.TXT [CODE_OWNERS.TXT] Update to include yours truly as the TableGen owner 2020-11-12 09:49:00 -05:00
configure
CREDITS.TXT [NFC] Add contributors names to CREDITS.TXT 2020-10-07 13:22:55 -04:00
LICENSE.TXT
llvm.spec.in
README.txt
RELEASE_TESTERS.TXT

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