[LLVMdev] creating a vreg in eliminateFrameIndex()

[Hal Finkel]

----- Original Message -----
> From: "Steve King" <steve at metrokings.com>
> To: llvmdev at cs.uiuc.edu
> Sent: Thursday, January 29, 2015 3:00:26 PM
> Subject: [LLVMdev] creating a vreg in eliminateFrameIndex()
> 
> 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?

It is made real by the register scavanger (see scavengeFrameVirtualRegs in lib/CodeGen/PrologEpilogInserter.cpp.

 -Hal

> 
> Thanks,
> -steve
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory