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Re: RFC: PATCH to use REFERENCE_TYPE for return by invisible reference
- From: Gabriel Dos Reis <gdr at integrable-solutions dot net>
- To: Jason Merrill <jason at redhat dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: 06 Aug 2004 23:05:42 +0200
- Subject: Re: RFC: PATCH to use REFERENCE_TYPE for return by invisible reference
- Organization: Integrable Solutions
- References: <xyp4qngui22.fsf@miranda.boston.redhat.com>
Jason Merrill <jason@redhat.com> writes:
| This patch follows up on my earlier patch to give parms passed by invisible
| reference REFERENCE_TYPE so that the optimizers know that they need to live
| past the end of the function. This patch does the same for the
| RESULT_DECL.
|
| This change is not as clearly necessary as the parallel one for parms was,
| since the RESULT_DECL is a pretty magical construct, but since in fact
| affected functions work by passing in and returning the address of the
| return slot, this patch does make what's really going on more explicit in
| the tree representation.
|
| Tested x86_64-pc-linux-gnu with no regressions. Bootstrap sped up
| dramatically in my testrun, from about 80 minutes to about 65 minutes user
| time, but it seems unlikely that this patch could have that effect, so I'm
| assuming that it was a transient timing artifact. Testing ran slightly
| faster.
|
| Does this seem like a good idea?
I like it.
-- Gaby