[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[lennox at cs dot columbia dot edu]

--- Comment #7 from lennox at cs dot columbia dot edu  2008-08-11 14:11 
---
The fact that the function returns the vector is not an essential part of the
test; the return value of the load function just needs not to be optimized out
as unused.  So changing the test for broader compatibility is fine as far as
I'm concerned.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[pinskia at gcc dot gnu dot org]

--- Comment #6 from pinskia at gcc dot gnu dot org  2008-08-10 20:19 ---
Note this testcase fails on powerpc64-linux-gnu with the following warning:
/home/apinski/src/local/gcc/gcc/testsuite/gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c:8:
warning: GCC vector returned by reference: non-standard ABI extension
with no compatibility guarantee


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[rguenth at gcc dot gnu dot org]

--- Comment #1 from rguenth at gcc dot gnu dot org  2008-08-07 08:50 ---
Confirmed.  This is the other machinery.

typedef long long __m128i __attribute__ ((__vector_size__ (16),
__may_alias__));

extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__,
__artificial__))
_mm_load_si128 (__m128i const *__P)
{
  return *__P;
}

static const short __attribute__((__aligned__(16))) tbl[8] =
{ 1, 2, 3, 4, 5, 6, 7, 8};


__m128i get_vec(void)
{
  __m128i ret;

  ret = _mm_load_si128((__m128i *)tbl);

  return ret;
}


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 Status|UNCONFIRMED |NEW
 Ever Confirmed|0   |1
   Keywords||diagnostic
   Last reconfirmed|-00-00 00:00:00 |2008-08-07 08:50:50
   date||


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[rguenth at gcc dot gnu dot org]

--- Comment #2 from rguenth at gcc dot gnu dot org  2008-08-07 08:51 ---
Mine.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
   |dot org |org
 Status|NEW |ASSIGNED
   Last reconfirmed|2008-08-07 08:50:50 |2008-08-07 08:51:06
   date||


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[rguenth at gcc dot gnu dot org]

--- Comment #3 from rguenth at gcc dot gnu dot org  2008-08-07 10:01 ---
Subject: Bug 37042

Author: rguenth
Date: Thu Aug  7 09:59:58 2008
New Revision: 138836

URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=138836
Log:
2008-08-07  Richard Guenther  [EMAIL PROTECTED]

PR middle-end/37042
* tree-ssa-alias-warnings.c (nonstandard_alias_p): Ref-all
pointers can access anything.

* gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c: New testcase.

Added:
   
branches/gcc-4_3-branch/gcc/testsuite/gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c
Modified:
branches/gcc-4_3-branch/gcc/ChangeLog
branches/gcc-4_3-branch/gcc/testsuite/ChangeLog
branches/gcc-4_3-branch/gcc/tree-ssa-alias-warnings.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[rguenth at gcc dot gnu dot org]

--- Comment #4 from rguenth at gcc dot gnu dot org  2008-08-07 10:02 ---
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 Status|ASSIGNED|RESOLVED
 Resolution||FIXED
   Target Milestone|--- |4.3.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042

[Bug middle-end/37042] Strict-aliasing warnings are printed for _mm_load_si128, even though __m128i is __attribute__((__may_alias__)).

[rguenth at gcc dot gnu dot org]

--- Comment #5 from rguenth at gcc dot gnu dot org  2008-08-07 10:03 ---
Subject: Bug 37042

Author: rguenth
Date: Thu Aug  7 10:01:48 2008
New Revision: 138837

URL: http://gcc.gnu.org/viewcvs?root=gccview=revrev=138837
Log:
2008-08-07  Richard Guenther  [EMAIL PROTECTED]

PR middle-end/37042
* tree-ssa-alias-warnings.c (nonstandard_alias_p): Ref-all
pointers can access anything.

* gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c: New testcase.

Added:
trunk/gcc/testsuite/gcc.dg/Wstrict-aliasing-bogus-ref-all-2.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-alias-warnings.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37042