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[AVR] When lowering shifts into loops, put newly generated MBBs in the same 

spot as the original MBB

Discovered in avr-rust/rust#62
https://github.com/avr-rust/rust/issues/62

Patch by Gergo Erdi.

llvm-svn: 314180
This commit is contained in:
Dylan McKay 2017-09-26 00:51:03 +00:00
parent 832c4a65c0
commit dada014781
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Target/AVR/AVRISelLowering.cpp
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@ -1469,8 +1469,10 @@ MachineBasicBlock *AVRTargetLowering::insertShift(MachineInstr &MI,
}
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator I = BB->getParent()->begin();
++I;
MachineFunction::iterator I;
for (I = F->begin(); I != F->end() && &(*I) != BB; ++I);
if (I != F->end()) ++I;
// Create loop block.
MachineBasicBlock *LoopBB = F->CreateMachineBasicBlock(LLVM_BB);