https://bugs.llvm.org/show_bug.cgi?id=36228
Bug ID: 36228
Summary: -O2 optimization bug
Product: clang
Version: 4.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: xu_zhong_x...@163.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Created attachment 19809
--> https://bugs.llvm.org/attachment.cgi?id=19809&action=edit
test case
The attached code behaves differently under -O0 and -O2.
clang version 4.0.1-6 (tags/RELEASE_401/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.2.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.2.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ clang++ -O0 main.cpp
$ ./a.out
BEGIN
END
$ clang++ -O2 main.cpp
$ ./a.out
BEGIN
ERROR: s.a = 255
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