[llvm-commits] [llvm] r63593 - in /llvm/trunk/lib/CodeGen/SelectionDAG: SelectionDAGBuild.cpp SelectionDAGISel.cpp

[Bill Wendling]

On Mon, Feb 2, 2009 at 5:49 PM, Evan Cheng <evan.cheng at apple.com> wrote:
>
> On Feb 2, 2009, at 5:33 PM, Bill Wendling wrote:
>
>> +++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp Mon
>> Feb  2 19:33:28 2009
>> @@ -333,7 +333,8 @@
>>         unsigned NumRegisters = TLI.getNumRegisters(VT);
>>         const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
>>         for (unsigned i = 0; i != NumRegisters; ++i)
>> -          BuildMI(MBB, TII->get(TargetInstrInfo::PHI), PHIReg+i);
>> +          BuildMI(MBB, DebugLoc::getUnknownLoc(),
>> +                  TII->get(TargetInstrInfo::PHI), PHIReg + i);
>>         PHIReg += NumRegisters;
>
> Perhaps these should have the same location as the first instruction
> in the basic block? If there are no instructions, it has to traverse
> up the predecessor chain.
>
At this point, there aren't any instructions in the BB (they're all
being created, and only PHI nodes will be in the blocks after it's
done). The only way I can think of to get information is to look for
the "llvm.dbg.stoppoint" calls and get the info that way. But that
involves having DAG around, which I don't think is available at this
point...

-bw