[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2005-10-22 03:36 -------
Fixed at least on the mainline:
t.c: In function 'ret':
t.c:3: warning: GCC vector returned by reference: non-standard ABI extension
with no compatibility guarantee
t.c: In function 'pass':
t.c:4: warning: GCC vector passed by reference: non-standard ABI extension with
no compatibility guarantee


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.0/4.1 Regression] missing|[4.0 Regression] missing
                   |error messages passing      |error messages passing
                   |vectors with -mno-altivec - |vectors with -mno-altivec -
                   |mabi=altivec                |mabi=altivec


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[paolo dot bonzini at lu dot unisi dot ch]

------- Comment #4 from paolo dot bonzini at lu dot unisi dot ch  2005-10-22 09:52 -------
Subject: Re:  [4.0 Regression] missing error messages passing vectors with
-mno-altivec -mabi=altivec

I *think* it is also fixed on 4.0; a grep for the error message in
config/rs6000/rs6000.c would confirm or deny this.

Paolo


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[bonzini at gnu dot org]

------- Comment #5 from bonzini at gnu dot org  2006-01-04 08:57 -------
Janis, can you confirm this is fixed on 4.0?


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bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[janis at gcc dot gnu dot org]

------- Comment #6 from janis at gcc dot gnu dot org  2006-01-05 17:52 -------
My nightly build compilers don't show errors or warnings from anything later
than 3.4:

elm3b11% /opt/gcc-nightly/trunk/bin/gcc -c -mno-altivec -mabi=altivec 18631.c
elm3b11% /opt/gcc-nightly/4.1/bin/gcc -c -mno-altivec -mabi=altivec 18631.c
elm3b11% /opt/gcc-nightly/4.0/bin/gcc -c -mno-altivec -mabi=altivec 18631.c
elm3b11% /opt/gcc-nightly/3.4/bin/gcc -c -mno-altivec -mabi=altivec 18631.c
18631.c: In function `ret':
18631.c:3: error: Cannot return value in vector register because altivec
instructions are disabled, use -maltivec to enable them.
18631.c: In function `pass':
18631.c:4: error: Cannot pass argument in vector register because altivec
instructions are disabled, use -maltivec to enable them.

Results are the same with -Wall, and for trunk on 20051002 and 20051030. 
Andrew, what options did you use to get the warnings shown in comment #3, and
was that with powerpc*-*-linux*?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.3                       |4.0.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[gdr at gcc dot gnu dot org]

------- Comment #7 from gdr at gcc dot gnu dot org  2007-01-18 03:11 -------
Won't fix for GCC-4.0.x


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[gdr at gcc dot gnu dot org]

------- Comment #8 from gdr at gcc dot gnu dot org  2007-02-03 15:31 -------
won't fix in GCC-4.0.4


-- 

gdr at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |WONTFIX


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[janis187 at us dot ibm dot com]

------- Additional Comments From janis187 at us dot ibm dot com  2004-11-24 16:53 -------
Oops, in the submission I said "There used to be error messages for passing
vectors by value or returning vectors from functions if AltiVec support was on
but the non-AltiVec ABI was used."  That should be: There used to be error
messages ... if AltiVec support was not on and the AltiVec ABI was used.

The AltiVec ABI says that vectors that map to hardware vectors are passed in
vector registers.  That variant of the ABI is the default but can be turned
off with -mabi=no-altivec, which is useful for binary compatibility with
modules that will be used on multiple types of PowerPC-64 hardware.  The ABI
doesn't cover generic vectors that don't map to hardware vectors, but GCC
passes them by reference for either variant of the ABI.  It probably doesn't
specifically cover the case of generic vectors that map to hardware vectors
when AltiVec support isn't enabled, but that seems surprising enough that it
ought to continue to be an error.

I personally think it ought to be an error to pass any synthetic vector by
value unless it is specifically covered by the ABI, but that's another mess
that no one wants to touch.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631

[Bug target/18631] [4.0 Regression] missing error messages passing vectors with -mno-altivec -mabi=altivec

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-11-24 06:18 -------
Confirmed, I really don't think this should be an error as on darwin like ppc64-linux the ABI defaults to 
the altivec ABI so there is no way to return "generic" vector on darwin or ppc64-linux.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |diagnostic
   Last reconfirmed|0000-00-00 00:00:00         |2004-11-24 06:18:55
               date|                            |
            Summary|missing error messages      |[4.0 Regression] missing
                   |passing vectors with -mno-  |error messages passing
                   |altivec -mabi=altivec       |vectors with -mno-altivec -
                   |                            |mabi=altivec
   Target Milestone|---                         |4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18631