From 6c3534c5aa6b1d34b277dfaca3af86ac41e53f0e Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Tue, 19 May 2009 01:52:46 +0000 Subject: [PATCH] Add some comments noting how IndVarSimplify facilitates LoopInfo functionality. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72091 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/Analysis/LoopInfo.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/llvm/Analysis/LoopInfo.h b/include/llvm/Analysis/LoopInfo.h index 69773a66ec1..fb0b584d41c 100644 --- a/include/llvm/Analysis/LoopInfo.h +++ b/include/llvm/Analysis/LoopInfo.h @@ -351,6 +351,9 @@ public: /// by one each time through the loop. If so, return the phi node that /// corresponds to it. /// + /// The IndVarSimplify pass transforms loops to have a canonical induction + /// variable. + /// inline PHINode *getCanonicalInductionVariable() const { BlockT *H = getHeader(); @@ -406,6 +409,9 @@ public: /// of the loop executes N-1 times. If the trip-count cannot be determined, /// this returns null. /// + /// The IndVarSimplify pass transforms loops to have a form that this + /// function easily understands. + /// inline Value *getTripCount() const { // Canonical loops will end with a 'cmp ne I, V', where I is the incremented // canonical induction variable and V is the trip count of the loop.