Additional information about basic blocks where the current variable is live. More...
#include "CodeGen/SplitKit.h"
Public Member Functions | |
| bool | isOneInstr () const |
| isOneInstr - Returns true when this BlockInfo describes a single instruction. More... | |
Public Attributes | |
| MachineBasicBlock * | MBB |
| SlotIndex | FirstInstr |
| First instr accessing current reg. More... | |
| SlotIndex | LastInstr |
| Last instr accessing current reg. More... | |
| SlotIndex | FirstDef |
| First non-phi valno->def, or SlotIndex(). More... | |
| bool | LiveIn |
| Current reg is live in. More... | |
| bool | LiveOut |
| Current reg is live out. More... | |
Detailed Description
Additional information about basic blocks where the current variable is live.
Such a block will look like one of these templates:
- | o—x | Internal to block. Variable is only live in this block.
- |—x | Live-in, kill.
- | o—| Def, live-out.
- |—x o—| Live-in, kill, def, live-out. Counted by NumGapBlocks.
- |—o—o—| Live-through with uses or defs.
- |--------—| Live-through without uses. Counted by NumThroughBlocks.
Two BlockInfo entries are created for template 4. One for the live-in segment, and one for the live-out segment. These entries look as if the block were split in the middle where the live range isn't live.
Live-through blocks without any uses don't get BlockInfo entries. They are simply listed in ThroughBlocks instead.
Definition at line 121 of file SplitKit.h.
Member Function Documentation
◆ isOneInstr()
|
inline |
isOneInstr - Returns true when this BlockInfo describes a single instruction.
Definition at line 131 of file SplitKit.h.
References llvm::SlotIndex::isSameInstr().
Referenced by llvm::SplitAnalysis::shouldSplitSingleBlock().
Member Data Documentation
◆ FirstDef
| SlotIndex llvm::SplitAnalysis::BlockInfo::FirstDef |
First non-phi valno->def, or SlotIndex().
Definition at line 125 of file SplitKit.h.
◆ FirstInstr
| SlotIndex llvm::SplitAnalysis::BlockInfo::FirstInstr |
First instr accessing current reg.
Definition at line 123 of file SplitKit.h.
Referenced by llvm::SplitAnalysis::shouldSplitSingleBlock(), and llvm::SplitEditor::splitSingleBlock().
◆ LastInstr
| SlotIndex llvm::SplitAnalysis::BlockInfo::LastInstr |
Last instr accessing current reg.
Definition at line 124 of file SplitKit.h.
Referenced by llvm::SplitEditor::splitSingleBlock().
◆ LiveIn
| bool llvm::SplitAnalysis::BlockInfo::LiveIn |
Current reg is live in.
Definition at line 126 of file SplitKit.h.
Referenced by getNumAllocatableRegsForConstraints(), and llvm::SplitAnalysis::shouldSplitSingleBlock().
◆ LiveOut
| bool llvm::SplitAnalysis::BlockInfo::LiveOut |
Current reg is live out.
Definition at line 127 of file SplitKit.h.
Referenced by getNumAllocatableRegsForConstraints(), llvm::SplitAnalysis::shouldSplitSingleBlock(), and llvm::SplitEditor::splitSingleBlock().
◆ MBB
| MachineBasicBlock* llvm::SplitAnalysis::BlockInfo::MBB |
Definition at line 122 of file SplitKit.h.
Referenced by llvm::SplitAnalysis::clear(), getNumAllocatableRegsForConstraints(), and llvm::SplitEditor::splitSingleBlock().
The documentation for this struct was generated from the following file:
- lib/CodeGen/SplitKit.h
