Index: llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -74,9 +74,11 @@
 
 STATISTIC(NumSimplified, "Number of library calls simplified");
 
+// Set instruction window wide to bypass looking for another guard and
+// also bypass @llvm.dbg.value instructions.
 static cl::opt<unsigned> GuardWideningWindow(
     "instcombine-guard-widening-window",
-    cl::init(3),
+    cl::init(8),
     cl::desc("How wide an instruction window to bypass looking for "
              "another guard"));