[TargetLowering][NFC] prepareUREMEqFold(): fixup comment

The comment initially matched the code, but the code was incorrect
and was fixed after the initial revert back back when it was introduced,
but the comment was never updated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@368701 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index f373eee469b089423468cf0e7fee9b7d559f0de8..eb39c2523e1669acfb2f706b030dbadddfd4e60d 100644 (file)
--- a/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -4866,7 +4866,7 @@ TargetLowering::prepareUREMEqFold(EVT SETCCVT, SDValue REMNode,
   // fold (seteq/ne (urem N, D), 0) -> (setule/ugt (rotr (mul N, P), K), Q)
   // - D must be constant, with D = D0 * 2^K where D0 is odd
   // - P is the multiplicative inverse of D0 modulo 2^W
-  // - Q = floor((2^W - 1) / D0)
+  // - Q = floor(((2^W) - 1) / D)
   // where W is the width of the common type of N and D.
   assert((Cond == ISD::SETEQ || Cond == ISD::SETNE) &&
          "Only applicable for (in)equality comparisons.");