[patch][pr22947] Use sext in fast isel

[Rafael Espíndola]

ping

On 18 March 2015 at 11:45, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> Fast isel currently has a bug in that it zero extends immediates to 64
> bits. This normally goes unnoticed because the value is truncated to
> 32 bits for output.
>
> Two cases were it is noticed:
>
> * We fail to use smaller encodings.
> * If the original constant was smaller than i32.
>
> For example, the only possible values for i1 are 0 and -1, yet we were
> expanding -1 to i32 1.
>
> Cheers,
> Rafael
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