[llvm-bugs] [Bug 45558] New: error in backend: Invalid register name global variable

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45558

            Bug ID: 45558
           Summary: error in backend: Invalid register name global
                    variable
           Product: libraries
           Version: 10.0
          Hardware: Other
                OS: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: pkubaj at anongoth.pl
                CC: llvm-bugs at lists.llvm.org, nemanja.i.ibm at gmail.com

FreeBSD head, LLVM 10.0.0, powerpc, powerpcspe and powerpc64 architectures

Reduced test:
register a asm("r15");
b() {
  while (a)
    ;
}

Compile with:
/usr/bin/cc -cc1 -triple powerpc64-unknown-freebsd13.0 -emit-obj -x c
main-7a3d93.c

Result:
fatal error: error in backend: Invalid register name global variable

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