Update prebuilt Clang to r416183b from Android.
https://android.googlesource.com/platform/prebuilts/clang/host/
linux-x86/+/06a71ddac05c22edb2d10b590e1769b3f8619bef
clang 12.0.5 (based on r416183b) from build 7284624.
Change-Id: I277a316abcf47307562d8b748b84870f31a72866
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/linux-x64/clang/include/llvm/CodeGen/LiveRangeCalc.h b/linux-x64/clang/include/llvm/CodeGen/LiveRangeCalc.h
new file mode 100644
index 0000000..bbb6f2d
--- /dev/null
+++ b/linux-x64/clang/include/llvm/CodeGen/LiveRangeCalc.h
@@ -0,0 +1,270 @@
+//===- LiveRangeCalc.h - Calculate live ranges -----------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// The LiveRangeCalc class can be used to implement the computation of
+// live ranges from scratch.
+// It caches information about values in the CFG to speed up repeated
+// operations on the same live range. The cache can be shared by
+// non-overlapping live ranges. SplitKit uses that when computing the live
+// range of split products.
+//
+// A low-level interface is available to clients that know where a variable is
+// live, but don't know which value it has as every point. LiveRangeCalc will
+// propagate values down the dominator tree, and even insert PHI-defs where
+// needed. SplitKit uses this faster interface when possible.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_LIVERANGECALC_H
+#define LLVM_LIB_CODEGEN_LIVERANGECALC_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/LiveInterval.h"
+#include "llvm/CodeGen/MachineBasicBlock.h"
+#include "llvm/CodeGen/SlotIndexes.h"
+#include "llvm/MC/LaneBitmask.h"
+#include <utility>
+
+namespace llvm {
+
+template <class NodeT> class DomTreeNodeBase;
+class MachineDominatorTree;
+class MachineFunction;
+class MachineRegisterInfo;
+
+using MachineDomTreeNode = DomTreeNodeBase<MachineBasicBlock>;
+
+class LiveRangeCalc {
+ const MachineFunction *MF = nullptr;
+ const MachineRegisterInfo *MRI = nullptr;
+ SlotIndexes *Indexes = nullptr;
+ MachineDominatorTree *DomTree = nullptr;
+ VNInfo::Allocator *Alloc = nullptr;
+
+ /// LiveOutPair - A value and the block that defined it. The domtree node is
+ /// redundant, it can be computed as: MDT[Indexes.getMBBFromIndex(VNI->def)].
+ using LiveOutPair = std::pair<VNInfo *, MachineDomTreeNode *>;
+
+ /// LiveOutMap - Map basic blocks to the value leaving the block.
+ using LiveOutMap = IndexedMap<LiveOutPair, MBB2NumberFunctor>;
+
+ /// Bit vector of active entries in LiveOut, also used as a visited set by
+ /// findReachingDefs. One entry per basic block, indexed by block number.
+ /// This is kept as a separate bit vector because it can be cleared quickly
+ /// when switching live ranges.
+ BitVector Seen;
+
+ /// Map LiveRange to sets of blocks (represented by bit vectors) that
+ /// in the live range are defined on entry and undefined on entry.
+ /// A block is defined on entry if there is a path from at least one of
+ /// the defs in the live range to the entry of the block, and conversely,
+ /// a block is undefined on entry, if there is no such path (i.e. no
+ /// definition reaches the entry of the block). A single LiveRangeCalc
+ /// object is used to track live-out information for multiple registers
+ /// in live range splitting (which is ok, since the live ranges of these
+ /// registers do not overlap), but the defined/undefined information must
+ /// be kept separate for each individual range.
+ /// By convention, EntryInfoMap[&LR] = { Defined, Undefined }.
+ using EntryInfoMap = DenseMap<LiveRange *, std::pair<BitVector, BitVector>>;
+ EntryInfoMap EntryInfos;
+
+ /// Map each basic block where a live range is live out to the live-out value
+ /// and its defining block.
+ ///
+ /// For every basic block, MBB, one of these conditions shall be true:
+ ///
+ /// 1. !Seen.count(MBB->getNumber())
+ /// Blocks without a Seen bit are ignored.
+ /// 2. LiveOut[MBB].second.getNode() == MBB
+ /// The live-out value is defined in MBB.
+ /// 3. forall P in preds(MBB): LiveOut[P] == LiveOut[MBB]
+ /// The live-out value passses through MBB. All predecessors must carry
+ /// the same value.
+ ///
+ /// The domtree node may be null, it can be computed.
+ ///
+ /// The map can be shared by multiple live ranges as long as no two are
+ /// live-out of the same block.
+ LiveOutMap Map;
+
+ /// LiveInBlock - Information about a basic block where a live range is known
+ /// to be live-in, but the value has not yet been determined.
+ struct LiveInBlock {
+ // The live range set that is live-in to this block. The algorithms can
+ // handle multiple non-overlapping live ranges simultaneously.
+ LiveRange &LR;
+
+ // DomNode - Dominator tree node for the block.
+ // Cleared when the final value has been determined and LI has been updated.
+ MachineDomTreeNode *DomNode;
+
+ // Position in block where the live-in range ends, or SlotIndex() if the
+ // range passes through the block. When the final value has been
+ // determined, the range from the block start to Kill will be added to LI.
+ SlotIndex Kill;
+
+ // Live-in value filled in by updateSSA once it is known.
+ VNInfo *Value = nullptr;
+
+ LiveInBlock(LiveRange &LR, MachineDomTreeNode *node, SlotIndex kill)
+ : LR(LR), DomNode(node), Kill(kill) {}
+ };
+
+ /// LiveIn - Work list of blocks where the live-in value has yet to be
+ /// determined. This list is typically computed by findReachingDefs() and
+ /// used as a work list by updateSSA(). The low-level interface may also be
+ /// used to add entries directly.
+ SmallVector<LiveInBlock, 16> LiveIn;
+
+ /// Check if the entry to block @p MBB can be reached by any of the defs
+ /// in @p LR. Return true if none of the defs reach the entry to @p MBB.
+ bool isDefOnEntry(LiveRange &LR, ArrayRef<SlotIndex> Undefs,
+ MachineBasicBlock &MBB, BitVector &DefOnEntry,
+ BitVector &UndefOnEntry);
+
+ /// Find the set of defs that can reach @p Kill. @p Kill must belong to
+ /// @p UseMBB.
+ ///
+ /// If exactly one def can reach @p UseMBB, and the def dominates @p Kill,
+ /// all paths from the def to @p UseMBB are added to @p LR, and the function
+ /// returns true.
+ ///
+ /// If multiple values can reach @p UseMBB, the blocks that need @p LR to be
+ /// live in are added to the LiveIn array, and the function returns false.
+ ///
+ /// The array @p Undef provides the locations where the range @p LR becomes
+ /// undefined by <def,read-undef> operands on other subranges. If @p Undef
+ /// is non-empty and @p Kill is jointly dominated only by the entries of
+ /// @p Undef, the function returns false.
+ ///
+ /// PhysReg, when set, is used to verify live-in lists on basic blocks.
+ bool findReachingDefs(LiveRange &LR, MachineBasicBlock &UseMBB, SlotIndex Use,
+ unsigned PhysReg, ArrayRef<SlotIndex> Undefs);
+
+ /// updateSSA - Compute the values that will be live in to all requested
+ /// blocks in LiveIn. Create PHI-def values as required to preserve SSA form.
+ ///
+ /// Every live-in block must be jointly dominated by the added live-out
+ /// blocks. No values are read from the live ranges.
+ void updateSSA();
+
+ /// Transfer information from the LiveIn vector to the live ranges and update
+ /// the given @p LiveOuts.
+ void updateFromLiveIns();
+
+protected:
+ /// Some getters to expose in a read-only way some private fields to
+ /// subclasses.
+ const MachineFunction *getMachineFunction() { return MF; }
+ const MachineRegisterInfo *getRegInfo() const { return MRI; }
+ SlotIndexes *getIndexes() { return Indexes; }
+ MachineDominatorTree *getDomTree() { return DomTree; }
+ VNInfo::Allocator *getVNAlloc() { return Alloc; }
+
+ /// Reset Map and Seen fields.
+ void resetLiveOutMap();
+
+public:
+ LiveRangeCalc() = default;
+
+ //===--------------------------------------------------------------------===//
+ // High-level interface.
+ //===--------------------------------------------------------------------===//
+ //
+ // Calculate live ranges from scratch.
+ //
+
+ /// reset - Prepare caches for a new set of non-overlapping live ranges. The
+ /// caches must be reset before attempting calculations with a live range
+ /// that may overlap a previously computed live range, and before the first
+ /// live range in a function. If live ranges are not known to be
+ /// non-overlapping, call reset before each.
+ void reset(const MachineFunction *mf, SlotIndexes *SI,
+ MachineDominatorTree *MDT, VNInfo::Allocator *VNIA);
+
+ //===--------------------------------------------------------------------===//
+ // Mid-level interface.
+ //===--------------------------------------------------------------------===//
+ //
+ // Modify existing live ranges.
+ //
+
+ /// Extend the live range of @p LR to reach @p Use.
+ ///
+ /// The existing values in @p LR must be live so they jointly dominate @p Use.
+ /// If @p Use is not dominated by a single existing value, PHI-defs are
+ /// inserted as required to preserve SSA form.
+ ///
+ /// PhysReg, when set, is used to verify live-in lists on basic blocks.
+ void extend(LiveRange &LR, SlotIndex Use, unsigned PhysReg,
+ ArrayRef<SlotIndex> Undefs);
+
+ //===--------------------------------------------------------------------===//
+ // Low-level interface.
+ //===--------------------------------------------------------------------===//
+ //
+ // These functions can be used to compute live ranges where the live-in and
+ // live-out blocks are already known, but the SSA value in each block is
+ // unknown.
+ //
+ // After calling reset(), add known live-out values and known live-in blocks.
+ // Then call calculateValues() to compute the actual value that is
+ // live-in to each block, and add liveness to the live ranges.
+ //
+
+ /// setLiveOutValue - Indicate that VNI is live out from MBB. The
+ /// calculateValues() function will not add liveness for MBB, the caller
+ /// should take care of that.
+ ///
+ /// VNI may be null only if MBB is a live-through block also passed to
+ /// addLiveInBlock().
+ void setLiveOutValue(MachineBasicBlock *MBB, VNInfo *VNI) {
+ Seen.set(MBB->getNumber());
+ Map[MBB] = LiveOutPair(VNI, nullptr);
+ }
+
+ /// addLiveInBlock - Add a block with an unknown live-in value. This
+ /// function can only be called once per basic block. Once the live-in value
+ /// has been determined, calculateValues() will add liveness to LI.
+ ///
+ /// @param LR The live range that is live-in to the block.
+ /// @param DomNode The domtree node for the block.
+ /// @param Kill Index in block where LI is killed. If the value is
+ /// live-through, set Kill = SLotIndex() and also call
+ /// setLiveOutValue(MBB, 0).
+ void addLiveInBlock(LiveRange &LR, MachineDomTreeNode *DomNode,
+ SlotIndex Kill = SlotIndex()) {
+ LiveIn.push_back(LiveInBlock(LR, DomNode, Kill));
+ }
+
+ /// calculateValues - Calculate the value that will be live-in to each block
+ /// added with addLiveInBlock. Add PHI-def values as needed to preserve SSA
+ /// form. Add liveness to all live-in blocks up to the Kill point, or the
+ /// whole block for live-through blocks.
+ ///
+ /// Every predecessor of a live-in block must have been given a value with
+ /// setLiveOutValue, the value may be null for live-trough blocks.
+ void calculateValues();
+
+ /// A diagnostic function to check if the end of the block @p MBB is
+ /// jointly dominated by the blocks corresponding to the slot indices
+ /// in @p Defs. This function is mainly for use in self-verification
+ /// checks.
+ LLVM_ATTRIBUTE_UNUSED
+ static bool isJointlyDominated(const MachineBasicBlock *MBB,
+ ArrayRef<SlotIndex> Defs,
+ const SlotIndexes &Indexes);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_LIVERANGECALC_H