LLVM
9.0.0svn

BasicBlockInfo  Information about the offset and size of a single basic block. More...
#include "Target/ARM/ARMBasicBlockInfo.h"
Public Member Functions  
BasicBlockInfo ()=default  
unsigned  internalKnownBits () const 
Compute the number of known offset bits internally to this block. More...  
unsigned  postOffset (unsigned LogAlign=0) const 
Compute the offset immediately following this block. More...  
unsigned  postKnownBits (unsigned LogAlign=0) const 
Compute the number of known low bits of postOffset. More...  
Public Attributes  
unsigned  Offset = 0 
Offset  Distance from the beginning of the function to the beginning of this basic block. More...  
unsigned  Size = 0 
Size  Size of the basic block in bytes. More...  
uint8_t  KnownBits = 0 
KnownBits  The number of low bits in Offset that are known to be exact. More...  
uint8_t  Unalign = 0 
Unalign  When nonzero, the block contains instructions (inline asm) of unknown size. More...  
uint8_t  PostAlign = 0 
PostAlign  When nonzero, the block terminator contains a .align directive, so the end of the block is aligned to 1 << PostAlign bytes. More...  
BasicBlockInfo  Information about the offset and size of a single basic block.
Definition at line 36 of file ARMBasicBlockInfo.h.

default 

inline 
Compute the number of known offset bits internally to this block.
This number should be used to predict worst case padding when splitting the block.
Definition at line 74 of file ARMBasicBlockInfo.h.
References llvm::tgtok::Bits, llvm::countTrailingZeros(), KnownBits, and Unalign.
Referenced by CompareMBBNumbers(), getUnconditionalBrDisp(), postKnownBits(), and postOffset().
Compute the number of known low bits of postOffset.
If this block contains inline asm, the number of known bits drops to the instruction alignment. An aligned terminator may increase the number of know bits. If LogAlign is given, also consider the alignment of the next block.
Definition at line 100 of file ARMBasicBlockInfo.h.
References internalKnownBits(), and llvm::max().
Compute the offset immediately following this block.
If LogAlign is specified, return the offset the successor block will get if it has this alignment.
Definition at line 86 of file ARMBasicBlockInfo.h.
References internalKnownBits(), llvm::max(), Size, and llvm::UnknownPadding().
Referenced by CompareMBBNumbers(), and getUnconditionalBrDisp().
uint8_t llvm::BasicBlockInfo::KnownBits = 0 
KnownBits  The number of low bits in Offset that are known to be exact.
The remaining bits of Offset are an upper bound.
Definition at line 57 of file ARMBasicBlockInfo.h.
Referenced by internalKnownBits().
unsigned llvm::BasicBlockInfo::Offset = 0 
Offset  Distance from the beginning of the function to the beginning of this basic block.
Offsets are computed assuming worst case padding before an aligned block. This means that subtracting basic block offsets always gives a conservative estimate of the real distance which may be smaller.
Because worst case padding is used, the computed offset of an aligned block may not actually be aligned.
Definition at line 46 of file ARMBasicBlockInfo.h.
Referenced by branchMaxOffsets(), and CompareMBBNumbers().
uint8_t llvm::BasicBlockInfo::PostAlign = 0 
PostAlign  When nonzero, the block terminator contains a .align directive, so the end of the block is aligned to 1 << PostAlign bytes.
Definition at line 67 of file ARMBasicBlockInfo.h.
Referenced by llvm::computeBlockSize().
unsigned llvm::BasicBlockInfo::Size = 0 
Size  Size of the basic block in bytes.
If the block contains inline assembly, this is a worst case estimate.
The size does not include any alignment padding whether from the beginning of the block, or from an aligned jump table at the end.
Definition at line 53 of file ARMBasicBlockInfo.h.
Referenced by BBHasFallthrough(), llvm::computeBlockSize(), and postOffset().
uint8_t llvm::BasicBlockInfo::Unalign = 0 
Unalign  When nonzero, the block contains instructions (inline asm) of unknown size.
The real size may be smaller than Size bytes by a multiple of 1 << Unalign.
Definition at line 62 of file ARMBasicBlockInfo.h.
Referenced by llvm::computeBlockSize(), and internalKnownBits().