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Date: Sun, 14 Aug 2005 06:17:00 -0000
From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050814061714.23384.pinskia@gcc.gnu.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug tree-optimization/23384] New: Clobber list should be flow sensitive
X-Bugzilla-Reason: CC
X-SW-Source: 2005-08/txt/msg01567.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

Take the following code:
struct f
{
  int i;
  int j;
};
void g(void);
void i(struct f*);

int kk(void)
{
  struct f a;
  int j;
  a.i = 1;
  a.j =2 ;
  g();
  j = a.i;
  i(&a);
  return j;
}

---
j should be changed to 1 as the address of a is not escape until after the call to i so g should not get a 
call clobbered for the SFT's of a.

-- 
           Summary: Clobber list should be flow sensitive
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23384