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[ARM][Windows] try/catch(...) around a call returning a large struct asserts in BranchFolding: "MBB is part of two scopes!" #239929
Description
The following code:
struct Large { int cs[32]; };
Large getLarge();
void f() { try { getLarge(); } catch (...) {} }Resulted in this output:
clang++: /root/llvm-project/llvm/lib/CodeGen/Analysis.cpp:859: void collectEHScopeMembers(llvm::DenseMap<const llvm::MachineBasicBlock*, int>&, int, const llvm::MachineBasicBlock*): Assertion `P.first->second == EHScope && "MBB is part of two scopes!"' failed.
Trunk reproducer (--target=thumbv7-windows): https://godbolt.org/z/efqhnWPa5
Activity
llvmorg-github-actions commentedon Nov 7, 2026
@llvm/issue-subscribers-backend-arm
Author: Jiang Yuancheng (YuanchengJiang)
Details
The following code: ```cpp struct Large { int cs[32]; }; Large getLarge(); void f() { try { getLarge(); } catch (...) {} } ```Resulted in this output:
Trunk reproducer (
--target=thumbv7-windows): https://godbolt.org/z/efqhnWPa5