[InstCombine] improve readability for icmp with cast folds; NFC

1. Update function name and stale code comments.
2. Use variable names that are less ambiguous.
3. Move operand checks into the function as early exits.

llvm-svn: 369390

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
index f8225b82ed1..71883b5692d 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
+++ b/llvm/lib/Transforms/InstCombine/InstCombineInternal.h
@@ -861,7 +861,7 @@ private:
                                     Constant *RHSC);
   Instruction *foldICmpAddOpConst(Value *X, const APInt &C,
                                   ICmpInst::Predicate Pred);
-  Instruction *foldICmpWithCastAndCast(ICmpInst &ICI);
+  Instruction *foldICmpWithCastOp(ICmpInst &ICI);
 
   Instruction *foldICmpUsingKnownBits(ICmpInst &Cmp);
   Instruction *foldICmpWithDominatingICmp(ICmpInst &Cmp);