diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
--- a/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -2254,7 +2254,7 @@
     // If this is a signed comparison to 0 and the shift is sign preserving,
     // use the shift LHS operand instead; isSignTest may change 'Pred', so only
     // do that if we're sure to not continue on in this function.
-    if (isSignTest(Pred, C))
+    if (0 && isSignTest(Pred, C))
       return new ICmpInst(Pred, X, Constant::getNullValue(ShType));
   }