bool MadeChange = false;
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
- // Look for store instructions, which may be memsets.
- StoreInst *SI = dyn_cast<StoreInst>(I++);
- if (SI == 0 || SI->isVolatile()) continue;
+ Instruction *Inst = I++;
+ // Look for store instructions, which may be optimized to memset/memcpy.
+ if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
+ if (SI->isVolatile()) continue;
- WeakVH InstPtr(SI);
- if (!processLoopStore(SI, BECount)) continue;
-
- MadeChange = true;
+ WeakVH InstPtr(I);
+ if (!processLoopStore(SI, BECount)) continue;
+ MadeChange = true;
+
+ // If processing the store invalidated our iterator, start over from the
+ // head of the loop.
+ if (InstPtr == 0)
+ I = BB->begin();
+ continue;
+ }
- // If processing the store invalidated our iterator, start over from the
- // head of the loop.
- if (InstPtr == 0)
- I = BB->begin();
}
return MadeChange;