LLVM  mainline
Defines | Functions | Variables
ARMConstantIslandPass.cpp File Reference
#include "ARM.h"
#include "ARMMachineFunctionInfo.h"
#include "MCTargetDesc/ARMAddressingModes.h"
#include "Thumb2InstrInfo.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <algorithm>
Include dependency graph for ARMConstantIslandPass.cpp:

Go to the source code of this file.

Defines

#define DEBUG_TYPE   "arm-cp-islands"

Functions

 STATISTIC (NumCPEs,"Number of constpool entries")
 STATISTIC (NumSplit,"Number of uncond branches inserted")
 STATISTIC (NumCBrFixed,"Number of cond branches fixed")
 STATISTIC (NumUBrFixed,"Number of uncond branches fixed")
 STATISTIC (NumTBs,"Number of table branches generated")
 STATISTIC (NumT2CPShrunk,"Number of Thumb2 constantpool instructions shrunk")
 STATISTIC (NumT2BrShrunk,"Number of Thumb2 immediate branches shrunk")
 STATISTIC (NumCBZ,"Number of CBZ / CBNZ formed")
 STATISTIC (NumJTMoved,"Number of jump table destination blocks moved")
 STATISTIC (NumJTInserted,"Number of jump table intermediate blocks inserted")
static unsigned UnknownPadding (unsigned LogAlign, unsigned KnownBits)
 UnknownPadding - Return the worst case padding that could result from unknown offset bits.
static bool CompareMBBNumbers (const MachineBasicBlock *LHS, const MachineBasicBlock *RHS)
 CompareMBBNumbers - Little predicate function to sort the WaterList by MBB ID.
static bool BBIsJumpedOver (MachineBasicBlock *MBB)
 BBIsJumpedOver - Return true of the specified basic block's only predecessor unconditionally branches to its only successor.
static unsigned getUnconditionalBrDisp (int Opc)
 getUnconditionalBrDisp - Returns the maximum displacement that can fit in the specific unconditional branch instruction.
static bool isSimpleIndexCalc (MachineInstr &I, unsigned EntryReg, unsigned BaseReg)
static bool jumpTableFollowsTB (MachineInstr *JTMI, MachineInstr *CPEMI)
 Returns whether CPEMI is the first instruction in the block immediately following JTMI (assumed to be a TBB or TBH terminator).

Variables

static cl::opt< boolAdjustJumpTableBlocks ("arm-adjust-jump-tables", cl::Hidden, cl::init(true), cl::desc("Adjust basic block layout to better use TB[BH]"))

Define Documentation

#define DEBUG_TYPE   "arm-cp-islands"

Definition at line 38 of file ARMConstantIslandPass.cpp.


Function Documentation

static bool BBIsJumpedOver ( MachineBasicBlock MBB) [static]
static bool CompareMBBNumbers ( const MachineBasicBlock LHS,
const MachineBasicBlock RHS 
) [static]

CompareMBBNumbers - Little predicate function to sort the WaterList by MBB ID.

Definition at line 937 of file ARMConstantIslandPass.cpp.

References llvm::MachineBasicBlock::getNumber().

static unsigned getUnconditionalBrDisp ( int  Opc) [inline, static]

getUnconditionalBrDisp - Returns the maximum displacement that can fit in the specific unconditional branch instruction.

Definition at line 1264 of file ARMConstantIslandPass.cpp.

static bool isSimpleIndexCalc ( MachineInstr I,
unsigned  EntryReg,
unsigned  BaseReg 
) [static]
static bool jumpTableFollowsTB ( MachineInstr JTMI,
MachineInstr CPEMI 
) [static]

Returns whether CPEMI is the first instruction in the block immediately following JTMI (assumed to be a TBB or TBH terminator).

If so, we can switch the first register to PC and usually remove the address calculation that preceeded it.

Definition at line 2062 of file ARMConstantIslandPass.cpp.

References llvm::MachineFunction::end(), and llvm::MachineInstr::getParent().

STATISTIC ( NumCPEs  ,
"Number of constpool entries"   
)
STATISTIC ( NumSplit  ,
"Number of uncond branches inserted"   
)
STATISTIC ( NumCBrFixed  ,
"Number of cond branches fixed"   
)
STATISTIC ( NumUBrFixed  ,
"Number of uncond branches fixed"   
)
STATISTIC ( NumTBs  ,
"Number of table branches generated"   
)
STATISTIC ( NumT2CPShrunk  ,
"Number of Thumb2 constantpool instructions shrunk"   
)
STATISTIC ( NumT2BrShrunk  ,
"Number of Thumb2 immediate branches shrunk"   
)
STATISTIC ( NumCBZ  ,
"Number of CBZ / CBNZ formed"   
)
STATISTIC ( NumJTMoved  ,
"Number of jump table destination blocks moved"   
)
STATISTIC ( NumJTInserted  ,
"Number of jump table intermediate blocks inserted"   
)
static unsigned UnknownPadding ( unsigned  LogAlign,
unsigned  KnownBits 
) [inline, static]

UnknownPadding - Return the worst case padding that could result from unknown offset bits.

This does not include alignment padding caused by known offset bits.

Parameters:
LogAlignlog2(alignment)
KnownBitsNumber of known low offset bits.

Definition at line 62 of file ARMConstantIslandPass.cpp.


Variable Documentation

cl::opt<bool> AdjustJumpTableBlocks("arm-adjust-jump-tables", cl::Hidden, cl::init(true), cl::desc("Adjust basic block layout to better use TB[BH]")) [static]