https://bugs.llvm.org/show_bug.cgi?id=49871
Bug ID: 49871
Summary: Merge 6abb92f2103a58d097620b4410054c5bb18c48ec into
12.0.0
Product: libraries
Version: 11.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Blocks: 48902
Please merge
https://github.com/llvm/llvm-project/commit/6abb92f2103a58d097620b4410054c5bb18c48ec.
[SCCP] Avoid modifying AdditionalUsers while iterating over it
When run under valgrind, or with a malloc that poisons freed memory,
this can lead to segfaults or other problems.
To avoid modifying the AdditionalUsers DenseMap while still iterating,
save the instructions to be notified in a separate SmallPtrSet, and use
this to later call OperandChangedState on each instruction.
Fixes PR49582.
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=48902
[Bug 48902] [meta] 12.0.0 Release Blockers
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