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[NFC][PowerPC] Improve the for loop in Early Return 

Summary:

In `PPCEarlyReturn.cpp`
```
183       for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
184         MachineBasicBlock &B = *I++;
185         if (processBlock(B))
186           Changed = true;
187       }
```
Above code can be improved to:
```
184       for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E;) {
185         MachineBasicBlock &B = *I++;
186         Changed |= processBlock(B);
187       }
```

Reviewed By: hfinkel

Differential Revision: https://reviews.llvm.org/D63800

llvm-svn: 364496
This commit is contained in:
Kang Zhang 2019-06-27 03:39:09 +00:00
parent f35a3456ea
commit 490bc46541
1 changed files with 4 additions and 4 deletions
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8
llvm/lib/Target/PowerPC/PPCEarlyReturn.cpp
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@ -179,11 +179,11 @@ public:
// nothing to do.
if (MF.size() < 2)
return Changed;
for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
// We can't use a range-based for loop due to clobbering the iterator.
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E;) {
MachineBasicBlock &B = *I++;
if (processBlock(B))
Changed = true;
Changed |= processBlock(B);
}
return Changed;