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Re: [PATCH] Fix PR79547

From: Marc Glisse <marc dot glisse at inria dot fr>
To: Richard Biener <rguenther at suse dot de>
Cc: gcc-patches at gcc dot gnu dot org
Date: Fri, 17 Feb 2017 11:35:25 +0100 (CET)
Subject: Re: [PATCH] Fix PR79547
Authentication-results: sourceware.org; auth=none
References: <alpine.LSU.2.20.1702161325270.6076@zhemvz.fhfr.qr> <alpine.LSU.2.20.1702171042390.8538@zhemvz.fhfr.qr>
Reply-to: gcc-patches at gcc dot gnu dot org

On Fri, 17 Feb 2017, Richard Biener wrote:

On Thu, 16 Feb 2017, Richard Biener wrote:


I am testing the following patch for PR79547.  Those builtins do not
return anything that can be used to re-construct the pointer(s) passed
to them.

Queued for GCC 8.


Actually we need calluse constraints.  Thus adjusted as follows.

Richard.

2017-02-17  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79547
	* tree-ssa-structalias.c (find_func_aliases_for_builtin_call):
	Handle strlen, strcmp, strncmp, strcasecmp, strncasecmp, memcmp,
	bcmp, strspn, strcspn, __builtin_object_size and __builtin_constant_p
	without any constraints.

We have EAF_NOESCAPE that we are using for non-builtins, though itprobably gets little use there. Would it make sense to use it here aswell, or would that be pointless?


--
Marc Glisse

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  - From: Richard Biener
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