GCC 4.3.4 is casting my QImode vars to SImode for libcall

[Paolo Bonzini]

On 06/15/2010 11:02 AM, Paulo J. Matos wrote:
> Just noticed the following also in optabs.c:
>
>    /* We can't do it with an insn, so use a library call.  But first ensure
>       that the mode of TO is at least as wide as SImode, since those are the
>       only library calls we know about.  */
>
>    if (GET_MODE_SIZE (GET_MODE (to))<  GET_MODE_SIZE (SImode))
>      {
>        target = gen_reg_rtx (SImode);
>        expand_fix (target, from, unsignedp);
>      }
>
> This comment provides some insight on to why gcc keeps converting to
> SImode.

I think the comment dates back to before the introduction of conversion 
optabs.

Maybe the right thing to compare with is the size of an int in bytes?

Paolo