[LLVMdev] creating a vreg in eliminateFrameIndex()

[Jonathan Roelofs]

On 1/29/15 2:00 PM, Steve King wrote:
> Hello LLVM,
> The ARM target sometimes adds an instruction with a virtual register
> in eliminateFrameIndex():
>
> https://github.com/llvm-mirror/llvm/blob/master/lib/Target/ARM/ARMBaseRegisterInfo.cpp
>
> This looks late for a virtual register to appear.  Where is this vreg made real?
The register scavenger should take care of such emergency post-RA 
register allocation. For thumb1, this happens in 
Thumb1RegisterInfo::saveScavengerRegister(): 
http://llvm.org/docs/doxygen/html/structllvm_1_1Thumb1RegisterInfo.html#ac73131381e7f5533f8e1e601f8e1c9ca


Cheers,

Jon
>
> Thanks,
> -steve
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-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded