[LLVMdev] splice and undefined physical reg

[Quentin Colombet]

Alex already answered your question.

Q.
> On Jul 28, 2015, at 1:46 AM, Johnny Bory <johnny.bory.12 at gmail.com> wrote:
> 
> Hi,
> 
> i have got some troubles while trying to instrumentate a indirect call instruction. 
> Basically, every time i run into a CALL64r i would like to have this situation:
>                  ------
>                 | .... |
>                 | CMP  |
>                 | JE   |
>                  ------
>                   |  |
>                 ---  -----
>                 |        |
>                 ----    ---- 
>                |EXIT|  |CALL|
>                 ----   |....|
>                         ----
> So i do a splice, fix up successors and predecessors, but since the call implicitly uses some register the compilation fails with a lot of this:
> 
>   *** Bad machine code: Using an undefined physical register ***
> - function:    parse_and_dump_tv_tag
> - basic block: BB#126 (null) (0x6127658)
> - instruction: CALL64r %vreg41, <regmask>, %RSP<imp-use>, %EDI<imp-use>, %RSI<imp-use>, %RDX<imp-use>, %RCX<imp-use>, %R8<imp-use>, %R9D<imp-use>, %AL<imp-use>, %RSP<imp-def>, %EAX<imp-def>; GR64:%vreg41
> 
> How can i get rid of this errors?
> 
> Thank you very much,
> 
> -- Jon
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150728/91f0608d/attachment.html>