[llvm-bugs] [Bug 44232] New: segmentation fault of target program caused by instcombine with "-sroa -loop-rotate -mergereturn -hotcoldsplit -load-store-vectorizer -instcombine"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44232

            Bug ID: 44232
           Summary: segmentation fault of target program caused by
                    instcombine with "-sroa -loop-rotate -mergereturn
                    -hotcoldsplit -load-store-vectorizer -instcombine"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22902
  --> https://bugs.llvm.org/attachment.cgi?id=22902&action=edit
small.bc

$clang -v
clang version 10.0.0 (https://github.com/llvm/llvm-project.git
759909506c2b557b9bc5cd3883970dea48e0b86b)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c

$opt -sroa -loop-rotate -mergereturn -hotcoldsplit -load-store-vectorizer
-instcombine small.bc -o small-opt.bc

$clang small-opt.bc -o small.out && ./small.out
Segmentation fault (core dumped)

------------------------------------------
struct a {
  signed : 7;
  signed b;
  signed : 7;
  unsigned c;
} d;
int e() {
  for (; 0;) {
    int f;
    for (; 0; 1)
      return f;
  }
}
struct a g() {
  e();
  return d;
}
void main() { g(); }

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