improve comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53243 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp
index af8a1aadfec9ab6b148b81d597dbe23c468cdef8..c7accb36862a8c7a04d94a234db299e1bf9f685d 100644 (file)
--- a/lib/VMCore/ConstantFold.cpp
+++ b/lib/VMCore/ConstantFold.cpp
@@ -1375,7 +1375,7 @@ Constant *llvm::ConstantFoldCompareInstruction(unsigned short pred,
   }
 
   if (C1->getType()->isFloatingPoint()) {
-    int Result = -1;
+    int Result = -1;  // -1 = unknown, 0 = known false, 1 = known true.
     switch (evaluateFCmpRelation(C1, C2)) {
     default: assert(0 && "Unknown relation!");
     case FCmpInst::FCMP_UNO: