[Bug middle-end/21595] New: __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[Bug middle-end/21595] New: __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[rguenth at gcc dot gnu dot org]

... because of different representations are passed to fold_builtin_constant_p.

-- 
           Summary: __builtin_constant_p(&"Hello"[0]) is true for C but not
                    for C++
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[rguenth at gcc dot gnu dot org]

------- Additional Comments From rguenth at gcc dot gnu dot org  2005-05-15 21:47 -------
patch in testing

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-05-15 21:47:03
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] [4.0/4.1 Regression] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-16 00:02 -------
This is also a regression from 3.4.0.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
      Known to fail|                            |4.0.0 4.1.0
      Known to work|                            |3.4.0
            Summary|__builtin_constant_p(&"Hello|[4.0/4.1 Regression]
                   |"[0]) is true for C but not |__builtin_constant_p(&"Hello
                   |for C++                     |"[0]) is true for C but not
                   |                            |for C++
   Target Milestone|---                         |4.0.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] [4.0/4.1 Regression] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-16 00:04 -------
Here is a compile time testcase:
int f[__builtin_constant_p(&"Hello"[0])?1:-1];


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] [4.0/4.1 Regression] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-05-17 09:00 -------
Subject: Bug 21595

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	rguenth@gcc.gnu.org	2005-05-17 09:00:03

Modified files:
	gcc            : ChangeLog builtins.c 
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/tree-ssa: builtin1.C 

Log message:
	2005-05-17  Richard Guenther  <rguenth@gcc.gnu.org>
	
	PR middle-end/21595
	* builtins.c (fold_builtin_constant_p): Handle
	&"string cst"[0] as constant.
	
	* g++.dg/tree-ssa/builtin1.C: New testcase.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8814&r2=2.8815
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/builtins.c.diff?cvsroot=gcc&r1=1.461&r2=1.462
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5482&r2=1.5483
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/tree-ssa/builtin1.C.diff?cvsroot=gcc&r1=NONE&r2=1.1



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] [4.0 Regression] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[rguenth at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |21619
              nThis|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595

[Bug middle-end/21595] [4.0 Regression] __builtin_constant_p(&"Hello"[0]) is true for C but not for C++

[rguenth at gcc dot gnu dot org]

------- Additional Comments From rguenth at gcc dot gnu dot org  2005-05-27 18:08 -------
Fixed for 4.0.1.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21595