https://bugs.llvm.org/show_bug.cgi?id=48449
Bug ID: 48449
Summary: "WebAssembly Fix Irreducible Control Flow" pass OOMs
on a huge function
Product: new-bugs
Version: 11.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: mej...@gmail.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
Created attachment 24250
--> https://bugs.llvm.org/attachment.cgi?id=24250&action=edit
LLVM IR that causes OOM
Clang/lib/AST/Interp/Disasm.cpp takes excessive time and resources to compile
when targeting WebAssembly. Memory usage exceeds 10GiB. It tends to OOM in
smaller machines.
The frontend completes without issues.
When running
clang -c Disasm.bc -mllvm -debug-pass=Executions
the last line printed before OOM is
[2020-12-08 19:16:08.463129734] 0x2d4fc70 Executing Pass 'WebAssembly Fix
Irreducible Control Flow' on Function
'_ZNK5clang6interp8Function4dumpERN4llvm11raw_ostreamE'
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