From: Tom de Vries <Tom_deVries@mentor.com>
To: Richard Biener <rguenther@suse.de>
Cc: "gcc-patches@gnu.org" <gcc-patches@gnu.org>
Subject: Re: [PATCH][PR67666] Handle single restrict pointer in struct in create_variable_info_for_1
Date: Tue, 29 Sep 2015 08:29:00 -0000 [thread overview]
Message-ID: <560A3383.3020608@mentor.com> (raw)
In-Reply-To: <alpine.LSU.2.11.1509220948590.24931@zhemvz.fhfr.qr>
On 22/09/15 09:49, Richard Biener wrote:
> On Tue, 22 Sep 2015, Tom de Vries wrote:
>
>> Hi,
>>
>> Consider this test-case:
>>
>> struct ps
>> {
>> int *__restrict__ p;
>> };
>>
>> void
>> f (struct ps &__restrict__ ps1)
>> {
>> *(ps1.p) = 1;
>> }
>>
>>
>> Atm, the restrict on p has no effect. Now, say we add a field to the struct:
>>
>> struct ps
>> {
>> int *__restrict__ p;
>> int a;
>> };
>>
>>
>> Then the restrict on p does have the desired effect.
>>
>>
>> This patch fixes the handling of structs with a single field in alias
>> analysis.
>>
>> Bootstrapped and reg-tested on x86_64.
>>
>> OK for trunk?
>
> Ok.
>
Hi,
I wonder if this follow-up patch is necessary.
Now that we handle structs with one field in the final loop of
create_variable_info_for_1, should we set the is_full_var field as well?
It used to be set for such structs before I committed the "Handle single
restrict pointer in struct in create_variable_info_for_1" patch.
Thanks,
- Tom
diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c
index 8d86dcb..26d97a3 100644
--- a/gcc/tree-ssa-structalias.c
+++ b/gcc/tree-ssa-structalias.c
@@ -5720,6 +5720,8 @@ create_variable_info_for_1 (tree decl, const char
*name)
newvi->offset = fo->offset;
newvi->size = fo->size;
newvi->fullsize = vi->fullsize;
+ if (fieldstack.length () == 1)
+ newvi->is_full_var = true;
newvi->may_have_pointers = fo->may_have_pointers;
newvi->only_restrict_pointers = fo->only_restrict_pointers;
if (i + 1 < fieldstack.length ())
next prev parent reply other threads:[~2015-09-29 6:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-22 7:45 Tom de Vries
2015-09-22 8:13 ` Richard Biener
2015-09-29 8:29 ` Tom de Vries [this message]
2015-09-29 9:50 ` Richard Biener
2015-10-23 9:59 ` Tom de Vries
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