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1 //==- llvm/CodeGen/AggressiveAntiDepBreaker.h - Anti-Dep Support -*- C++ -*-==//
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
10 // implements register anti-dependence breaking during post-RA
11 // scheduling. It attempts to break all anti-dependencies within a
14 //===----------------------------------------------------------------------===//
39   /// Contains all the state necessary for anti-dep breaking.
42     /// Information about a register reference within a liverange
52     /// Number of non-virtual target registers (i.e. TRI->getNumRegs()).
55     /// Implements a disjoint-union data structure to
56     /// form register groups. A node is represented by an index into
57     /// the vector. A node can "point to" itself to indicate that it
58     /// is the parent of a group, or point to another node to indicate
59     /// that it is a member of the same group as that node.
64     /// Register 0 is always represented by the 0 group, a group
65     /// composed of registers that are not eligible for anti-aliasing.
68     /// Map registers to all their references within a live range.
71     /// The index of the most recent kill (proceeding bottom-up),
72     /// or ~0u if the register is not live.
76     /// up), or ~0u if the register is live.
91     // Get the group for a register. The returned value is
95     // Return a vector of the registers belonging to a group.
96     // If RegRefs is non-NULL then only included referenced registers.
103     // Union Reg1's and Reg2's groups to form a new group.
107     // Remove a register from its current group and place
112     /// Return true if Reg is live.
128     /// The state used to identify and rename anti-dependence registers.
140     /// Initialize anti-dep breaking for a new basic block.
143     /// Identifiy anti-dependencies along the critical path
156     /// Finish anti-dep breaking for a basic block.
160     /// Keep track of a position in the allocation order for each regclass.
163     /// Return true if MO represents a register
167     /// If MI implicitly def/uses a register, then