[llvm-dev] Terminators in MachineBasicBlock

[Quentin Colombet via llvm-dev]

> On Mar 24, 2016, at 11:23 AM, Tom Chen <cyt046 at gmail.com> wrote:
> 
> So in your example there are two terminators in the basic block (`br if` and `br else`)?

Yes.

> 
> 2016-03-24 14:15 GMT-04:00 Quentin Colombet <qcolombet at apple.com <mailto:qcolombet at apple.com>>:
> Hi,
> 
> > On Mar 24, 2016, at 10:58 AM, Tom Chen via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> >
> > Hi,
> > Why does a MachineBasicBlock have multiple terminator instructions (unlike BasicBlock, which can only have one) ?
> 
> Think of it as predicated instructions.
> E.g.,
> bool = icmp
> if bool : br if
> br else
> 
> As for why, we could indeed have split those terminators into several basic blocks, but it would have required more MachineBasicBlock objects.
> 
> Cheers,
> -Quentin
> > Thanks,
> > Tom
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> 
> 

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