diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 4d5dae7d960..636fa6c1dab 100644 --- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -961,6 +961,12 @@ bool TargetLowering::SimplifyDemandedBits( Known, TLO, Depth + 1)) return true; + // Try shrinking the operation as long as the shift amount will still be + // in range. + if ((ShAmt < DemandedBits.getActiveBits()) && + ShrinkDemandedOp(Op, BitWidth, DemandedBits, TLO)) + return true; + // Convert (shl (anyext x, c)) to (anyext (shl x, c)) if the high bits // are not demanded. This will likely allow the anyext to be folded away. if (Op0.getOpcode() == ISD::ANY_EXTEND) { |
