[SelectionDAG] Use APInt::isSubsetOf/intersects to simplify some code.

Also use KnownBits::isNegative/isNonNegative to further simplify.

llvm-svn: 367518

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 2520de49efb..2143fef6adc 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -3090,12 +3090,12 @@ KnownBits SelectionDAG::computeKnownBits(SDValue Op, const APInt &DemandedElts,
 
         // If the first operand is non-negative or has all low bits zero, then
         // the upper bits are all zero.
-        if (Known2.Zero[BitWidth-1] || ((Known2.Zero & LowBits) == LowBits))
+        if (Known2.isNonNegative() || LowBits.isSubsetOf(Known2.Zero))
           Known.Zero |= ~LowBits;
 
         // If the first operand is negative and not all low bits are zero, then
         // the upper bits are all one.
-        if (Known2.One[BitWidth-1] && ((Known2.One & LowBits) != 0))
+        if (Known2.isNegative() && LowBits.intersects(Known2.One))
           Known.One |= ~LowBits;
         assert((Known.Zero & Known.One) == 0&&"Bits known to be one AND zero?");
       }