Make this easier to understand, as suggested by Chandler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168196 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp
index e223a049f0..7c3f8fe15d 100644
--- a/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -2358,15 +2358,20 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
       // Determine Y and Z in the form icmp (X+Y), (X+Z).
       Value *Y, *Z;
       if (A == C) {
+        // C + B == C + D  ->  B == D
         Y = B;
         Z = D;
       } else if (A == D) {
+        // D + B == C + D  ->  B == C
         Y = B;
         Z = C;
       } else if (B == C) {
+        // A + C == C + D  ->  A == D
         Y = A;
         Z = D;
-      } else if (B == D) {
+      } else {
+        assert(B == D);
+        // A + D == C + D  ->  A == C
         Y = A;
         Z = C;
       }