[llvm-bugs] [Bug 28348] Regression(r272251): error in backend: Cannot select: t45: i32 = ARMISD::BFI t4, Constant:i32<1>, t34

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Jul 4 09:43:15 PDT 2016


James Molloy <james.molloy at arm.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #10 from James Molloy <james.molloy at arm.com> ---
Hi Nico,

Thanks for bringing this to my attention, and sorry that I didn't act on it
quickly as I was on vacation.

The underlying problem is actually my use of DAG->getConstant. I should be
using DAG->getTargetConstant.

The use of getConstant() in this testcase actually increments the use count of
Constant<4095> from one to two. In this case, the lowering of ARMISD::BFI is
contingent on its constant argument only having one use - if it's shared, ISel
falls over.

I've committed a fixed version in r274510.



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