It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/IntervalPartition.cpp b/lib/Analysis/IntervalPartition.cpp
new file mode 100644
index 0000000..e339691
--- /dev/null
+++ b/lib/Analysis/IntervalPartition.cpp
@@ -0,0 +1,114 @@
+//===- IntervalPartition.cpp - Interval Partition module code -------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the definition of the IntervalPartition class, which
+// calculates and represent the interval partition of a function.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/IntervalIterator.h"
+using namespace llvm;
+
+char IntervalPartition::ID = 0;
+static RegisterPass<IntervalPartition>
+X("intervals", "Interval Partition Construction", true);
+
+//===----------------------------------------------------------------------===//
+// IntervalPartition Implementation
+//===----------------------------------------------------------------------===//
+
+// destroy - Reset state back to before function was analyzed
+void IntervalPartition::destroy() {
+ for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
+ delete Intervals[i];
+ IntervalMap.clear();
+ RootInterval = 0;
+}
+
+void IntervalPartition::print(std::ostream &O, const Module*) const {
+ for(unsigned i = 0, e = Intervals.size(); i != e; ++i)
+ Intervals[i]->print(O);
+}
+
+// addIntervalToPartition - Add an interval to the internal list of intervals,
+// and then add mappings from all of the basic blocks in the interval to the
+// interval itself (in the IntervalMap).
+//
+void IntervalPartition::addIntervalToPartition(Interval *I) {
+ Intervals.push_back(I);
+
+ // Add mappings for all of the basic blocks in I to the IntervalPartition
+ for (Interval::node_iterator It = I->Nodes.begin(), End = I->Nodes.end();
+ It != End; ++It)
+ IntervalMap.insert(std::make_pair(*It, I));
+}
+
+// updatePredecessors - Interval generation only sets the successor fields of
+// the interval data structures. After interval generation is complete,
+// run through all of the intervals and propagate successor info as
+// predecessor info.
+//
+void IntervalPartition::updatePredecessors(Interval *Int) {
+ BasicBlock *Header = Int->getHeaderNode();
+ for (Interval::succ_iterator I = Int->Successors.begin(),
+ E = Int->Successors.end(); I != E; ++I)
+ getBlockInterval(*I)->Predecessors.push_back(Header);
+}
+
+// IntervalPartition ctor - Build the first level interval partition for the
+// specified function...
+//
+bool IntervalPartition::runOnFunction(Function &F) {
+ // Pass false to intervals_begin because we take ownership of it's memory
+ function_interval_iterator I = intervals_begin(&F, false);
+ assert(I != intervals_end(&F) && "No intervals in function!?!?!");
+
+ addIntervalToPartition(RootInterval = *I);
+
+ ++I; // After the first one...
+
+ // Add the rest of the intervals to the partition.
+ for (function_interval_iterator E = intervals_end(&F); I != E; ++I)
+ addIntervalToPartition(*I);
+
+ // Now that we know all of the successor information, propagate this to the
+ // predecessors for each block.
+ for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
+ updatePredecessors(Intervals[i]);
+ return false;
+}
+
+
+// IntervalPartition ctor - Build a reduced interval partition from an
+// existing interval graph. This takes an additional boolean parameter to
+// distinguish it from a copy constructor. Always pass in false for now.
+//
+IntervalPartition::IntervalPartition(IntervalPartition &IP, bool)
+ : FunctionPass((intptr_t) &ID) {
+ Interval *FunctionStart = IP.getRootInterval();
+ assert(FunctionStart && "Cannot operate on empty IntervalPartitions!");
+
+ // Pass false to intervals_begin because we take ownership of it's memory
+ interval_part_interval_iterator I = intervals_begin(IP, false);
+ assert(I != intervals_end(IP) && "No intervals in interval partition!?!?!");
+
+ addIntervalToPartition(RootInterval = *I);
+
+ ++I; // After the first one...
+
+ // Add the rest of the intervals to the partition.
+ for (interval_part_interval_iterator E = intervals_end(IP); I != E; ++I)
+ addIntervalToPartition(*I);
+
+ // Now that we know all of the successor information, propagate this to the
+ // predecessors for each block.
+ for (unsigned i = 0, e = Intervals.size(); i != e; ++i)
+ updatePredecessors(Intervals[i]);
+}
+