[llvm-bugs] [Bug 41619] New: r358887 causes fatal error: error in backend: Cannot emit physreg copy instruction

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41619

            Bug ID: 41619
           Summary: r358887 causes fatal error: error in backend: Cannot
                    emit physreg copy instruction
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: rtrieu at google.com
                CC: llvm-bugs at lists.llvm.org, llvm-dev at redking.me.uk

$ cat test.ii
using Vec = float __attribute__((__vector_size__(16)));
Vec getVector();
Vec makeVector(float f) {
  float g;
  return {g, f, f};
}

struct A {
  union {
    Vec v;
    float arr[4];
  };
  A() : v(getVector()) {}
  A(Vec k) : v(k) {}
};

struct B : A {
  B() {}
  B(float f) : A(makeVector(f)) {}
  float &operator[](int i) { return arr[i]; }
};


struct C {
  B d[2];
  C() {}
  C(B b0, B b1) : d{b0, b1} {}

  B &operator[](int i) { return d[i]; }

  void Bar(C);

  C calculate() {
    C ret;
    for (int i = 0; i < 3; i++)
      for (int j = 0; j < 3; j++)
        ret[i][j] = d[j][i];
    return ret;
  }
};

void run(B b) {
  C c1 = C(B(), B(b[0]));
  C c2 = c1.calculate();
  c2.Bar(c1);
}

$ clang -mavx2 -O2 test.ii
fatal error: error in backend: Cannot emit physreg copy instruction
clang-9: error: clang frontend command failed with exit code 70

$ clang -mavx2 -O2 test.ii -v
"/usr/local/bin/clang-9" -cc1 -triple x86_64-unknown-linux-gnu -emit-obj
-disable-free -disable-llvm-verifier -discard-value-names -main-file-name
test.ii -mrelocation-model static -mthread-model posix -fmath-errno
-masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array
-target-cpu x86-64 -target-feature +avx2 -dwarf-column-info
-debugger-tuning=gdb -momit-leaf-frame-pointer -v -resource-dir
/usr/local/lib/clang/9.0.0 -O2 -fdeprecated-macro -fdebug-compilation-dir
/usr/local/crash -ferror-limit 19 -fmessage-length 80 -fobjc-runtime=gcc
-fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics
-vectorize-loops -vectorize-slp -o /tmp/test-4ae44d.o -x c++-cpp-output test.ii
-faddrsig

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