[llvm-bugs] [Bug 26803] New: LLVM ERROR: Cannot select: t30: i32 = AArch64ISD::FCCMP

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26803

            Bug ID: 26803
           Summary: LLVM ERROR: Cannot select: t30: i32 =
                    AArch64ISD::FCCMP
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: kai at redstar.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15969
  --> https://llvm.org/bugs/attachment.cgi?id=15969&action=edit
IR file demonstrating the bug

The attached bugpoint-reduced test case produces the error message if run with
llc -O3:

LLVM ERROR: Cannot select: t30: i32 = AArch64ISD::FCCMP undef:f128, undef:f128,
Constant:i32<1>, Constant:i32<0>, t29
  t9: f128 = undef
  t9: f128 = undef
  t27: i32 = Constant<1>
  t28: i32 = Constant<0>
  t29: f128 = AArch64ISD::FCMP undef:f128, t35
    t9: f128 = undef
    t35: f128,ch = load<LD16[ConstantPool]> t0, t39, undef:i64
      t39: i64 = AArch64ISD::ADDlow t38, TargetConstantPool:i64<fp128
0xL00000000000000000000000000000000> 0 [TF=34]
        t38: i64 = AArch64ISD::ADRP TargetConstantPool:i64<fp128
0xL00000000000000000000000000000000> 0 [TF=1]
          t36: i64 = TargetConstantPool<fp128
0xL00000000000000000000000000000000> 0 [TF=1]
        t37: i64 = TargetConstantPool<fp128
0xL00000000000000000000000000000000> 0 [TF=34]
      t34: i64 = undef
In function: _D2rt4util8typeinfo15__T8FloatingTcZ6equalsFNaNbNfccZb

This occurs while compiling module rt.util.ti_Acreal with current LDC D
compiler on native AArch64 Linux.

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