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Re: [PATCH] Add save_expr langhook (PR c/68513)
- From: Marek Polacek <polacek at redhat dot com>
- To: Richard Biener <rguenther at suse dot de>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>, Joseph Myers <joseph at codesourcery dot com>, Jakub Jelinek <jakub at redhat dot com>
- Date: Mon, 30 Nov 2015 16:41:43 +0100
- Subject: Re: [PATCH] Add save_expr langhook (PR c/68513)
- Authentication-results: sourceware.org; auth=none
- References: <20151127185531 dot GA28072 at redhat dot com> <43651703-7ABE-491D-8D5B-863E921EA365 at suse dot de>
On Sat, Nov 28, 2015 at 08:50:12AM +0100, Richard Biener wrote:
> Different approach: after the FE folds (unexpectedly?), scan the result for
> SAVE_EXPRs and if found, drop the folding.
Neither this fixes this problem completely, because we simply don't know where
those SAVE_EXPRs might be introduced: it might be convert(), but e.g. when I
changed the original testcase a tiny bit (added -), then those SAVE_EXPRs were
introduced in a different spot (via c_process_stmt_expr -> c_fully_fold).
Marek