[llvm-bugs] [Bug 28132] New: Clang fails on Windows with enabled exceptions during loop unrolling

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28132

            Bug ID: 28132
           Summary: Clang fails on Windows with enabled exceptions during
                    loop unrolling
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: adamf88 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16544
  --> https://llvm.org/bugs/attachment.cgi?id=16544&action=edit
Compilation data

If I try to compile this program with exceptions enabled and -O2 then I get
error message:

Assertion failed: L->isLoopSimplifyForm() && "Must put loop into normal form
fir
st.", file
D:\src\llvm_package_272293\llvm\lib\Transforms\Scalar\LoopUnrollPass.
cpp, line 363

compilation script:
clang-cl /EHsc main.cpp -O2 /link

Source code (also in attachment):

#include <vector>

using namespace std;

struct Block
{
    int colorA;
    int colorB;
};

int main()
{
    while (true)
    {
        vector<Block> blocks;
        for (int i = 0; i < 6; i++) {
            blocks.push_back(Block());
        }

        throw Block();
    }
}

In attachment I added also preprocessed source and whole compilation output.

Tested also on most recent available revision @272572

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