[llvm] r199365 - Copy segment register when optimizing to MOV8ao8/MOV16ao16/MOV32ao32.

[Chandler Carruth]

Test case?


On Wed, Jan 15, 2014 at 11:57 PM, Craig Topper <craig.topper at gmail.com>wrote:

> Author: ctopper
> Date: Thu Jan 16 01:57:45 2014
> New Revision: 199365
>
> URL: http://llvm.org/viewvc/llvm-project?rev=199365&view=rev
> Log:
> Copy segment register when optimizing to MOV8ao8/MOV16ao16/MOV32ao32.
>
> Modified:
>     llvm/trunk/lib/Target/X86/X86MCInstLower.cpp
>
> Modified: llvm/trunk/lib/Target/X86/X86MCInstLower.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86MCInstLower.cpp?rev=199365&r1=199364&r2=199365&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Target/X86/X86MCInstLower.cpp (original)
> +++ llvm/trunk/lib/Target/X86/X86MCInstLower.cpp Thu Jan 16 01:57:45 2014
> @@ -323,15 +323,16 @@ static void SimplifyShortMoveForm(X86Asm
>    if (Absolute &&
>        (Inst.getOperand(AddrBase + 0).getReg() != 0 ||
>         Inst.getOperand(AddrBase + 2).getReg() != 0 ||
> -       Inst.getOperand(AddrBase + 4).getReg() != 0 ||
>         Inst.getOperand(AddrBase + 1).getImm() != 1))
>      return;
>
>    // If so, rewrite the instruction.
>    MCOperand Saved = Inst.getOperand(AddrOp);
> +  MCOperand Seg = Inst.getOperand(AddrBase + 4);
>    Inst = MCInst();
>    Inst.setOpcode(Opcode);
>    Inst.addOperand(Saved);
> +  Inst.addOperand(Seg);
>  }
>
>  static unsigned getRetOpcode(const X86Subtarget &Subtarget)
>
>
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