[llvm-bugs] [Bug 28348] New: Regression(270823:273743): error in backend: Cannot select: t45: i32 = ARMISD::BFI t4, Constant:i32<1>, t34

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https://llvm.org/bugs/show_bug.cgi?id=28348

            Bug ID: 28348
           Summary: Regression(270823:273743): error in backend: Cannot
                    select: t45: i32 = ARMISD::BFI t4, Constant:i32<1>,
                    t34
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

thakis at thakis:/tmp$ cat repro.cc
struct A { A(char*); };

struct D : A {
  D(char* p1) : A(p1) {}
};

class C {
  void m_fn1(int a);
  char *ValidateFrame_data_ptr;
};
void C::m_fn1(int a) {
  D(new char[a & ~4095]);
  ValidateFrame_data_ptr += 4096 + (a & 4095);
}
thakis at thakis:/tmp$ $HOME/src/llvm-build/bin/clang-3.8 -cc1 -triple
thumbv7--linux-android -emit-obj -Os repro.cc
fatal error: error in backend: Cannot select: t45: i32 = ARMISD::BFI t4,
Constant:i32<1>, t34
  t4: i32,ch = CopyFromReg t0, Register:i32 %vreg1
    t3: i32 = Register %vreg1
  t44: i32 = Constant<1>
  t34: i32 = t2MOVi16 TargetConstant:i32<4095>, TargetConstant:i32<14>,
Register:i32 %noreg
    t56: i32 = TargetConstant<4095>
    t51: i32 = TargetConstant<14>
    t52: i32 = Register %noreg
In function: _ZN1C5m_fn1Ei

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