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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