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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
//===-- LiveRangeUtils.h - Live Range modification utilities ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// This file contains helper functions to modify live ranges.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_CODEGEN_LIVERANGEUTILS_H
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#define LLVM_LIB_CODEGEN_LIVERANGEUTILS_H
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#include "llvm/CodeGen/LiveInterval.h"
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namespace llvm {
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/// Helper function that distributes live range value numbers and the
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/// corresponding segments of a master live range \p LR to a list of newly
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/// created live ranges \p SplitLRs. \p VNIClasses maps each value number in \p
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/// LR to 0 meaning it should stay or to 1..N meaning it should go to a specific
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/// live range in the \p SplitLRs array.
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template<typename LiveRangeT, typename EqClassesT>
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static void DistributeRange(LiveRangeT &LR, LiveRangeT *SplitLRs[],
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EqClassesT VNIClasses) {
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// Move segments to new intervals.
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typename LiveRangeT::iterator J = LR.begin(), E = LR.end();
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while (J != E && VNIClasses[J->valno->id] == 0)
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++J;
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for (typename LiveRangeT::iterator I = J; I != E; ++I) {
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if (unsigned eq = VNIClasses[I->valno->id]) {
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assert((SplitLRs[eq-1]->empty() || SplitLRs[eq-1]->expiredAt(I->start)) &&
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"New intervals should be empty");
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SplitLRs[eq-1]->segments.push_back(*I);
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} else
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*J++ = *I;
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}
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LR.segments.erase(J, E);
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// Transfer VNInfos to their new owners and renumber them.
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unsigned j = 0, e = LR.getNumValNums();
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while (j != e && VNIClasses[j] == 0)
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++j;
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for (unsigned i = j; i != e; ++i) {
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VNInfo *VNI = LR.getValNumInfo(i);
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if (unsigned eq = VNIClasses[i]) {
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VNI->id = SplitLRs[eq-1]->getNumValNums();
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SplitLRs[eq-1]->valnos.push_back(VNI);
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} else {
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VNI->id = j;
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LR.valnos[j++] = VNI;
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}
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}
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LR.valnos.resize(j);
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}
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} // End llvm namespace
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#endif
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