[llvm-bugs] [Bug 37431] New: clang crashes with "-mllvm -enable-newgvn": error in backend: No support for lowering a copy into EFLAGS when used by this instruction!

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37431

            Bug ID: 37431
           Summary: clang crashes with "-mllvm -enable-newgvn": error in
                    backend: No support for lowering a copy into EFLAGS
                    when used by this instruction!
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: helloqirun at gmail.com
                CC: llvm-bugs at lists.llvm.org

It happens in 32-bit mode and "-O3".


$ clang-trunk -v
clang version 7.0.0 (trunk 332156)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin


$ clang-trunk -mllvm -enable-newgvn -m32 -O3 abc.c
fatal error: error in backend: No support for lowering a copy into EFLAGS when
used by this instruction!
clang-7: error: clang frontend command failed with exit code 70 (use -v to see
invocation)
clang version 7.0.0 (trunk 332156)
Target: i386-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
clang-7: 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-7: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-7: note: diagnostic msg: /tmp/abc-1cee0a.c
clang-7: note: diagnostic msg: /tmp/abc-1cee0a.sh
clang-7: note: diagnostic msg:

********************


$ cat abc.c
char a, b, c;
char *d;
long e;
void fn1() {
  long *f = &e;
  char *g = &b;
  short h;
  unsigned long long i = e;
  for (; h <= 3; h += 1) {
    i && (c = 2);
    *g = *f = 0;
    a = e || *d;
  }
  c %= *g -= i > a;
}

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