https://bugs.llvm.org/show_bug.cgi?id=50288
Bug ID: 50288
Summary: opt -enable-loop-distribute -loop-distribute crashes
with Assertion `Partition != -2 && "Pointer not
belonging to any partition"' failed.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Created attachment 24846
--> https://bugs.llvm.org/attachment.cgi?id=24846&action=edit
bbi-55997.ll reproducer
Reproduce with:
opt -enable-new-pm=0 -enable-loop-distribute -loop-distribute -o /dev/null
bbi-55997.ll
Result
opt: ../lib/Transforms/Scalar/LoopDistribute.cpp:531: SmallVector<int, 8>
(anonymous
namespace)::InstPartitionContainer::computePartitionSetForPointers(const
llvm::LoopAccessInfo &): Assertion `Partition != -2 && "Pointer not belonging
to any partition"' failed.
This starts happening with 1ed7f8ede564
[LAA] Support pointer phis in loop by analyzing each incoming pointer.
SCEV does not look through non-header PHIs inside the loop. Such phis
can be analyzed by adding separate accesses for each incoming pointer
value.
This results in 2 more loops vectorized in SPEC2000/186.crafty and
avoids regressions when sinking instructions before vectorizing.
Reviewed By: Meinersbur
Differential Revision: https://reviews.llvm.org/D101286
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