PR37363: PR36090 and PR36182 all over again

[Paolo Bonzini]

> I'm not sure about this bit. Couldn't [snip cse.c code]
> simply be replaced by:
> 
>       /* We can't simplify extension ops unless we know the
> 	 original mode.  */
>       if ((code == ZERO_EXTEND || code == SIGN_EXTEND)
> 	  && mode_arg0 == VOIDmode)
> 	break;
> 
>       new = simplify_unary_operation (code, mode,
> 				      const_arg0 ? const_arg0 : folded_arg0,
> 				      mode_arg0);
> ?
> 
> (Sorry if I'm repeating earlier discussion here.)

I think so -- I was just trying to resemble the existing code as much as
possible (stage3), but it's probably better to clean up instead.  What
do you thing about the simplify-rtx.c part instead?

Paolo
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