[patch][pr22947] Use sext in fast isel

[Rafael Espíndola]

ping

On 27 March 2015 at 14:00, Rafael Espíndola <rafael.espindola at gmail.com> wrote:
> 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