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Use next() helper to make code more readable. Use

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MachineFunction::iterator instead of MachineBasicBlock* to avoid
dereferencing end iterators.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15373 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-07-31 15:14:29 +00:00
parent dd04583781
commit 9fd332392c
1 changed files with 6 additions and 4 deletions
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10
lib/CodeGen/BranchFolding.cpp
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@ -20,6 +20,7 @@
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "Support/STLExtras.h"
using namespace llvm;
namespace {
@ -113,7 +114,7 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB,
// explicitly.
if (MBB->empty()) {
if (MBB->pred_empty()) return false;
MachineFunction::iterator FallThrough = MBB; ++FallThrough;
MachineFunction::iterator FallThrough = next(MBB);
assert(FallThrough != MBB->getParent()->end() &&
"Fell off the end of the function!");
while (!MBB->pred_empty()) {
@ -138,7 +139,7 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB,
// If MBB does not end with a barrier, add a goto instruction to the end.
if (Pred->empty() || !TII.isBarrier(Pred->back().getOpcode()))
TII.insertGoto(*Pred, *++MachineFunction::iterator(MBB));
TII.insertGoto(*Pred, *next(MBB));
// Update the CFG now.
Pred->removeSuccessor(Pred->succ_begin());
@ -170,7 +171,7 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB,
if (isUncondBranch(--MBB->end(), TII)) {
MachineBasicBlock::iterator MI = --MBB->end();
MachineInstr *UncondBr = MI;
MachineFunction::iterator FallThrough = MBB; ++FallThrough;
MachineFunction::iterator FallThrough = next(MBB);
MachineFunction::iterator UncondDest =
MI->getOperand(0).getMachineBasicBlock();
@ -187,7 +188,8 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB,
// We assume that conditional branches always have the branch dest as the
// last operand. This could be generalized in the future if needed.
unsigned LastOpnd = MI->getNumOperands()-1;
if (MI->getOperand(LastOpnd).getMachineBasicBlock() == &*FallThrough) {
if (MachineFunction::iterator(
MI->getOperand(LastOpnd).getMachineBasicBlock()) == FallThrough) {
// Change the cond branch to go to the uncond dest, nuke the uncond,
// then reverse the condition.
MI->getOperand(LastOpnd).setMachineBasicBlock(UncondDest);