[Patch][Hexagon] Peephole optimizations for zero extends.

[Anshuman Dasgupta]

LGTM. Please go ahead and commit.

-Anshu

---
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On 5/2/2013 2:24 PM, Pranav Bhandarkar wrote:
> Hi,
>
> This patch adds a peephole optimizations for zero_extends (i32->i64).
>
> It does two types of optimizations.
> 1) Converts
>   "
>                  vreg_i64 = combine (#0, vreg_i32)
>                  .....  = vreg_i64:subreg_loreg
>   "
>    into
>   "
>                 vreg_i64 = combine (#0, vreg_i32)
>                 .....   = vreg_i32.
>   "
>
> 2) Adds patterns in the td file to convert
>         " (i64 (zero_extend i32 vreg_i32)) | (shl vreg_i64, 32) "
>   into a Hexgaon MI
>        " combine_rr (vreg_i64:subreg_loreg, vreg_i32) "
>
> Jyotsna, Anshu: Ok to commit ?
>
> Thanks,
> Pranav
>
>
>
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