[llvm] r299618 - foo

[Aaron Ballman via llvm-commits]

On Thu, Apr 6, 2017 at 12:02 AM, Craig Topper via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: ctopper
> Date: Wed Apr  5 23:02:28 2017
> New Revision: 299618
>
> URL: http://llvm.org/viewvc/llvm-project?rev=299618&view=rev
> Log:
> foo

A more descriptive commit message would be appreciated. ;-)

~Aaron

>
> Modified:
>     llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
>
> Modified: llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp?rev=299618&r1=299617&r2=299618&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp (original)
> +++ llvm/trunk/lib/CodeGen/SelectionDAG/TargetLowering.cpp Wed Apr  5 23:02:28 2017
> @@ -791,6 +791,9 @@ bool TargetLowering::SimplifyDemandedBit
>        // TODO: Should we check for other forms of sign-bit comparisons?
>        // Examples: X <= -1, X >= 0
>      }
> +    if (getBooleanContents(Op.getOperand(0).getValueType()) ==
> +            BooleanContent::ZeroOrOneBooleanContent && BitWidth > 1)
> +      KnownZero.setBitsFrom(1);
>      break;
>    }
>    case ISD::SHL:
>
>
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