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Remove isAccessable.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34497 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Laskey 2007-02-22 16:39:03 +00:00
parent a4e7cd947e
commit 033c9715d9
2 changed files with 4 additions and 8 deletions
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4
include/llvm/CodeGen/MachineBasicBlock.h
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@ -165,10 +165,6 @@ public:
/// this basic block is entered via an exception handler.
void setIsLandingPad() { IsLandingPad = true; }
/// isAccessable - Returns true if the block is alive. That is, if it has
/// predecessors or is an eh landing pad.
bool isAccessable() const { return !pred_empty() || isLandingPad(); }
// Code Layout methods.
/// moveBefore/moveAfter - move 'this' block before or after the specified

8
lib/CodeGen/BranchFolding.cpp
View File

@ -67,7 +67,7 @@ FunctionPass *llvm::createBranchFoldingPass() { return new BranchFolder(); }
/// RemoveDeadBlock - Remove the specified dead machine basic block from the
/// function, updating the CFG.
void BranchFolder::RemoveDeadBlock(MachineBasicBlock *MBB) {
assert(!MBB->isAccessable() && "MBB must be dead!");
assert(MBB->pred_empty() && "MBB must be dead!");
DOUT << "\nRemoving MBB: " << *MBB;
MachineFunction *MF = MBB->getParent();
@ -440,7 +440,7 @@ bool BranchFolder::OptimizeBranches(MachineFunction &MF) {
OptimizeBlock(MBB);
// If it is dead, remove it.
if (!MBB->isAccessable()) {
if (MBB->pred_empty()) {
RemoveDeadBlock(MBB);
MadeChange = true;
++NumDeadBlocks;
@ -618,14 +618,14 @@ void BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) {
// explicitly.
if (MBB->empty()) {
// Dead block? Leave for cleanup later.
if (!MBB->isAccessable()) return;
if (MBB->pred_empty()) return;
if (FallThrough == MBB->getParent()->end()) {
// TODO: Simplify preds to not branch here if possible!
} else {
// Rewrite all predecessors of the old block to go to the fallthrough
// instead.
while (MBB->isAccessable()) {
while (!MBB->pred_empty()) {
MachineBasicBlock *Pred = *(MBB->pred_end()-1);
ReplaceUsesOfBlockWith(Pred, MBB, FallThrough, TII);
}