1 //===- Interval.cpp - Interval class code ------------------------*- C++ -*--=//
3 // This file contains the definition of the cfg::Interval class, which
4 // represents a partition of a control flow graph of some kind.
6 //===----------------------------------------------------------------------===//
8 #include "llvm/Analysis/Interval.h"
9 #include "llvm/BasicBlock.h"
11 //===----------------------------------------------------------------------===//
12 // Interval Implementation
13 //===----------------------------------------------------------------------===//
15 // isLoop - Find out if there is a back edge in this interval...
17 bool cfg::Interval::isLoop() const {
18 // There is a loop in this interval iff one of the predecessors of the header
19 // node lives in the interval.
20 for (BasicBlock::pred_iterator I = HeaderNode->pred_begin(),
21 E = HeaderNode->pred_end(); I != E; ++I) {
22 if (contains(*I)) return true;