6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-05 13:26:55 +00:00
Code Issues Projects Releases Wiki Activity

Provide a function that ensures MBB numbering is dense and inorder. This

Browse Source 
can be used by MachineFunctionPasses who need this property.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30706 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-10-03 19:18:57 +00:00
parent f938099aa1
commit e70cab0ca4
2 changed files with 55 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/llvm/CodeGen/MachineFunction.h
View File

@@ -224,8 +224,16 @@ public:
}
/// getNumBlockIDs - Return the number of MBB ID's allocated.
///
unsigned getNumBlockIDs() const { return MBBNumbering.size(); }
/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
/// recomputes them. This guarantees that the MBB numbers are sequential,
/// dense, and match the ordering of the blocks within the function. If a
/// specific MachineBasicBlock is specified, only that block and those after
/// it are renumbered.
void RenumberBlocks(MachineBasicBlock *MBBFrom = 0);
/// print - Print out the MachineFunction in a format suitable for debugging
/// to the specified stream.
///

47
lib/CodeGen/MachineFunction.cpp
View File

@@ -132,6 +132,53 @@ MachineFunction::~MachineFunction() {
delete[] UsedPhysRegs;
}
/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
/// recomputes them. This guarantees that the MBB numbers are sequential,
/// dense, and match the ordering of the blocks within the function. If a
/// specific MachineBasicBlock is specified, only that block and those after
/// it are renumbered.
void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
if (empty()) { MBBNumbering.clear(); return; }
MachineFunction::iterator MBBI, E = end();
if (MBB == 0)
MBBI = begin();
else
MBBI = MBB;
// Figure out the block number this should have.
unsigned BlockNo = 0;
if (MBB != &front()) {
MachineFunction::iterator I = MBB;
--I;
BlockNo = I->getNumber()+1;
}
for (; MBBI != E; ++MBBI, ++BlockNo) {
if (MBBI->getNumber() != (int)BlockNo) {
// Remove use of the old number.
if (MBBI->getNumber() != -1) {
assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
"MBB number mismatch!");
MBBNumbering[MBBI->getNumber()] = 0;
}
// If BlockNo is already taken, set that block's number to -1.
if (MBBNumbering[BlockNo])
MBBNumbering[BlockNo]->setNumber(-1);
MBBNumbering[BlockNo] = MBBI;
MBBI->setNumber(BlockNo);
}
}
// Okay, all the blocks are renumbered. If we have compactified the block
// numbering, shrink MBBNumbering now.
assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
MBBNumbering.resize(BlockNo);
}
void MachineFunction::dump() const { print(std::cerr); }
void MachineFunction::print(std::ostream &OS) const {