[llvm-bugs] [Bug 47373] New: fatal error: error in backend: Cannot select: t13: v4f32 = fdiv nsz arcp afn reassoc t41, t48

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47373

            Bug ID: 47373
           Summary: fatal error: error in backend: Cannot select: t13:
                    v4f32 = fdiv nsz arcp afn reassoc t41, t48
           Product: libraries
           Version: 11.0
          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 11.0.0 rc2, powerpc64 elfv2

Command:
/usr/bin/cc -cc1 -triple powerpc64-unknown-freebsd13.0 -emit-obj
-menable-unsafe-fp-math -target-cpu ppc64 -O1 -vectorize-loops normvol-5b9b03.c

Reduced test case:
float *a, *b();
int c();
void d() {
  float *e, *h = a;
  int f, g = c();
  e = b();
  f = 0;
  for (; f < g; f++)
    h[f] /= e[f];
}

Result:
fatal error: error in backend: Cannot select: t13: v4f32 = fdiv nsz arcp afn
reassoc t41, t48
  t41: v4f32 = bitcast t40
    t40: v4i32 = llvm.ppc.altivec.vperm Constant:i32<6205>, t34, t37, t32
      t39: i32 = Constant<6205>
      t34: v4i32,ch = llvm.ppc.altivec.lvx<(load 31 from %ir.uglygep2728 - 15,
align 4)> t0, TargetConstant:i64<6058>, t11
        t33: i64 = TargetConstant<6058>
        t11: i64 = add t4, t6
          t4: i64,ch = CopyFromReg t0, Register:i64 %0
            t3: i64 = Register %0
          t6: i64,ch = CopyFromReg t0, Register:i64 %5
            t5: i64 = Register %5
      t37: v4i32,ch = llvm.ppc.altivec.lvx<(load 31 from %ir.uglygep2728 + 1,
align 4)> t0, TargetConstant:i64<6058>, t36
        t33: i64 = TargetConstant<6058>
        t36: i64 = add t11, Constant:i64<15>
          t11: i64 = add t4, t6
            t4: i64,ch = CopyFromReg t0, Register:i64 %0
              t3: i64 = Register %0
            t6: i64,ch = CopyFromReg t0, Register:i64 %5
              t5: i64 = Register %5
          t35: i64 = Constant<15>
      t32: v16i8 = llvm.ppc.altivec.lvsl Constant:i32<6056>, t11
        t31: i32 = Constant<6056>
        t11: i64 = add t4, t6
          t4: i64,ch = CopyFromReg t0, Register:i64 %0
            t3: i64 = Register %0
          t6: i64,ch = CopyFromReg t0, Register:i64 %5
            t5: i64 = Register %5
  t48: v4f32 = bitcast t47
    t47: v4i32 = llvm.ppc.altivec.vperm Constant:i32<6205>, t43, t45, t42
      t39: i32 = Constant<6205>
      t43: v4i32,ch = llvm.ppc.altivec.lvx<(load 31 from %ir.uglygep2526 - 15,
align 4)> t0, TargetConstant:i64<6058>, t7
        t33: i64 = TargetConstant<6058>
        t7: i64 = add t2, t6
          t2: i64,ch = CopyFromReg t0, Register:i64 %2
            t1: i64 = Register %2
          t6: i64,ch = CopyFromReg t0, Register:i64 %5
            t5: i64 = Register %5
      t45: v4i32,ch = llvm.ppc.altivec.lvx<(load 31 from %ir.uglygep2526 + 1,
align 4)> t0, TargetConstant:i64<6058>, t44
        t33: i64 = TargetConstant<6058>
        t44: i64 = add t7, Constant:i64<15>
          t7: i64 = add t2, t6
            t2: i64,ch = CopyFromReg t0, Register:i64 %2
              t1: i64 = Register %2
            t6: i64,ch = CopyFromReg t0, Register:i64 %5
              t5: i64 = Register %5
          t35: i64 = Constant<15>
      t42: v16i8 = llvm.ppc.altivec.lvsl Constant:i32<6056>, t7
        t31: i32 = Constant<6056>
        t7: i64 = add t2, t6
          t2: i64,ch = CopyFromReg t0, Register:i64 %2
            t1: i64 = Register %2
          t6: i64,ch = CopyFromReg t0, Register:i64 %5
            t5: i64 = Register %5
In function: d

It happens during compilation of VLC 3.0.11.

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