Use make_range(rbegin(), rend()) to allow foreach loops. NFC.
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.
llvm-svn: 243163
diff --git a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
index 941129b..39c259d 100644
--- a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -101,26 +101,23 @@
// 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 @@
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;