[PATCH] Fix combine's make_extraction (PR rtl-optimization/78378)

[Segher Boessenkool]

On Wed, Nov 16, 2016 at 10:07:23PM +0100, Jakub Jelinek wrote:
> If inner is a MEM, make_extraction requires that pos is a multiple of bytes
> and deals with offsetting it.  Or otherwise requires that pos is a multiple
> of BITS_PER_WORD and for REG inner it handles that too.  But if inner
> is something different, it calls just force_to_mode to the target mode,
> which only really works if pos is 0.
> 
> Thus the following patch restricts it to that case.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

Yes, thanks!


Segher