[llvm-commits] [llvm] r161302 - in /llvm/trunk: include/llvm/Target/TargetSelectionDAG.td lib/Target/PowerPC/PPCISelLowering.cpp lib/Target/PowerPC/PPCInstr64Bit.td test/CodeGen/PowerPC/ppc64-cyclecounter.ll

[Adhemerval Zanella]

Hi Hal,

On 08/04/2012 11:10 AM, Hal Finkel wrote:

> +let Pattern = [(set G8RC:$rT, readcyclecounter)] in
> +def MFTB8 : XFXForm_1_ext<31, 371, 268, (outs G8RC:$rT), (ins),
> +                          "mftb $rT", SprMFTB>,
> +            PPC970_DGroup_First, PPC970_Unit_FXU;
> +
>  let Defs = [X1], Uses = [X1] in
>  def DYNALLOC8 : Pseudo<(outs G8RC:$result), (ins G8RC:$negsize, memri:$fpsi),"",
>                         [(set G8RC:$result,

The 'mftb/mftbu' are deprecated on PowerISA 2.06 (indicated as Phased-Out) and currently
they are defined as mnemonics to 'mftb Rx,268/mfspr Rx,268". So I would suggest a change
to use 'mfspr Rx, 268' instead of relying on 'mftb' for PPC64.

-- 
Adhemerval Zanella Netto
  Software Engineer
  Linux Technology Center Brazil
  Toolchain / GLIBC on Power Architecture
  azanella at linux.vnet.ibm.com / azanella at br.ibm.com
  +55 61 8642-9890