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Use make_range(rbegin(), rend()) to allow foreach loops. NFC.

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Instead of the pattern

for (auto I = x.rbegin(), E = x.end(); I != E; ++I)

we can use make_range to construct the reverse range and iterate using
that instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243163 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2015-07-24 21:13:43 +00:00
parent d232d63fa2
commit 9f2f1650c4
10 changed files with 26 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
lib/CodeGen/DeadMachineInstructionElim.cpp
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@@ -101,26 +101,23 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
// Loop over all instructions in all blocks, from bottom to top, so that it's
// more likely that chains of dependent but ultimately dead instructions will
// be cleaned up.
for (MachineFunction::reverse_iterator I = MF.rbegin(), E = MF.rend();
I != E; ++I) {
MachineBasicBlock *MBB = &*I;
for (MachineBasicBlock &MBB : make_range(MF.rbegin(), MF.rend())) {
// Start out assuming that reserved registers are live out of this block.
LivePhysRegs = MRI->getReservedRegs();
// Add live-ins from sucessors to LivePhysRegs. Normally, physregs are not
// live across blocks, but some targets (x86) can have flags live out of a
// block.
for (MachineBasicBlock::succ_iterator S = MBB->succ_begin(),
E = MBB->succ_end(); S != E; S++)
for (MachineBasicBlock::succ_iterator S = MBB.succ_begin(),
E = MBB.succ_end(); S != E; S++)
for (MachineBasicBlock::livein_iterator LI = (*S)->livein_begin();
LI != (*S)->livein_end(); LI++)
LivePhysRegs.set(*LI);
// Now scan the instructions and delete dead ones, tracking physreg
// liveness as we go.
for (MachineBasicBlock::reverse_iterator MII = MBB->rbegin(),
MIE = MBB->rend(); MII != MIE; ) {
for (MachineBasicBlock::reverse_iterator MII = MBB.rbegin(),
MIE = MBB.rend(); MII != MIE; ) {
MachineInstr *MI = &*MII;
// If the instruction is dead, delete it!
@@ -132,7 +129,7 @@ bool DeadMachineInstructionElim::runOnMachineFunction(MachineFunction &MF) {
MI->eraseFromParentAndMarkDBGValuesForRemoval();
AnyChanges = true;
++NumDeletes;
MIE = MBB->rend();
MIE = MBB.rend();
// MII is now pointing to the next instruction to process,
// so don't increment it.
continue;