[llvm-bugs] [Bug 42452] New: clang cannot emit physreg copy instruction after optimizating with "opt -load-store-vectorizer -instcombine -loop-rotate -gvn -indvars -indvars

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42452

            Bug ID: 42452
           Summary: clang cannot emit physreg copy instruction after
                    optimizating with "opt -load-store-vectorizer
                    -instcombine -loop-rotate -gvn  -indvars -indvars
           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 22169
  --> https://bugs.llvm.org/attachment.cgi?id=22169&action=edit
.bc file of the source code

$clang -v
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/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 -load-store-vectorizer -instcombine -loop-rotate -gvn -indvars -indvars
small.bc -o small-opt.bc

$clang -debug small-opt.bc -o small.out
fatal error: error in backend: Cannot emit physreg copy instruction
clang-9: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 9.0.0 (trunk 363125)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build1/bin
clang-9: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.llvm.org/ and include the crash backtrace, preprocessed source,
and associated run script.
clang-9: note: diagnostic msg: Error generating preprocessed source(s) - no
preprocessable inputs.

---------------------------------------------------------------
short a;
unsigned long ***b;
char c;
int d;
void main() {
  unsigned long **e;
  unsigned long ***f[] = {&e, &e};
  c = 0;
  for (; c <= 9; ++c)
    a = d;
  b = f[1];
}

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