[PATCH] Fix COMPONENT_REF expansion (PR rtl-optimization/77919)

[Eric Botcazou]

> Though, perhaps COMPLEX_MODE_P (mode1) is also wrong, if mode1 isn't
> GET_MODE (op0), then we still will return something with unexpected mode
> (e.g. DCmode vs. CDImode); I wonder if for such mismatches we shouldn't
> just force_reg (convert_modes ()) each CONCAT operand separately and
> create a new CONCAT.  Do we have a guarantee that COMPLEX_MODE_P (GET_MODE
> (op0)) if op0 is CONCAT?

In practice, at this point of the pipeline, I'd think so.

> 2016-10-27  Jakub Jelinek  <jakub@redhat.com>
> 
> 	PR rtl-optimization/77919
> 	* expr.c (expand_expr_real_1) <normal_inner_ref>: Force CONCAT into
> 	MEM if mode1 is not a complex mode.
> 
> 	* g++.dg/torture/pr77919.C: New test.

I think that's OK.

-- 
Eric Botcazou