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//===- InductionVars.cpp - Induction Variable Cannonicalization code --------=//
//
// This file implements induction variable cannonicalization of loops.
//
// Specifically, after this executes, the following is true:
// - There is a single induction variable for each loop (that used to contain
// at least one induction variable)
// - This induction variable starts at 0 and steps by 1 per iteration
// - All other preexisting induction variables are adjusted to operate in
// terms of this primary induction variable
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Intervals.h"
#include "llvm/Opt/AllOpts.h"
#include "llvm/Assembly/Writer.h"
static void PrintIntervalInfo(cfg::Interval *I) {
cerr << "-------------------------------------------------------------\n"
<< "Interval Contents:\n";
// Print out all of the basic blocks in the interval...
copy(I->Nodes.begin(), I->Nodes.end(),
ostream_iterator<BasicBlock*>(cerr, "\n"));
cerr << "Interval Predecessors:\n";
copy(I->Predecessors.begin(), I->Predecessors.end(),
ostream_iterator<BasicBlock*>(cerr, "\n"));
cerr << "Interval Successors:\n";
copy(I->Successors.begin(), I->Successors.end(),
ostream_iterator<BasicBlock*>(cerr, "\n"));
}
// DoInductionVariableCannonicalize - Simplify induction variables in loops
//
bool DoInductionVariableCannonicalize(Method *M) {
cfg::IntervalPartition Intervals(M);
// This currently just prints out information about the interval structure
// of the method...
for_each(Intervals.begin(), Intervals.end(), PrintIntervalInfo);
cerr << "*************Reduced Interval**************\n\n";
cfg::IntervalPartition Intervals2(Intervals, false);
// This currently just prints out information about the interval structure
// of the method...
for_each(Intervals2.begin(), Intervals2.end(), PrintIntervalInfo);
return false;
}
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