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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/54362] New: COND_EXPR not understood by either alias or ITM
Date: Fri, 24 Aug 2012 03:04:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54362

             Bug #: 54362
           Summary: COND_EXPR not understood by either alias or ITM
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pinskia@gcc.gnu.org


Take this slightly modified  gcc.dg/tm/memopt-12.c :

/* { dg-do compile } */
/* { dg-options "-fgnu-tm -O3 -fdump-tree-tmmark" } */

extern int test(void) __attribute__((transaction_safe));
extern void *malloc (__SIZE_TYPE__) __attribute__((malloc,transaction_safe));

struct large { int foo[500]; };

int f(int j)
{
  int *p1, *p2, *p3;

  p1 = malloc (sizeof (*p1)*5000);
  __transaction_atomic {
    _Bool t;
    int i = 1;
    *p1 = 0;

    p2 = malloc (sizeof (*p2)*6000);
    *p2 = 1;
    t = test();

    for (i = 0;i < j;i++)
    {

    /* p3 = PHI (p1, p2) */
    if (t)
      p3 = p1;
    else
      p3 = p2;

    /* Since both p1 and p2 are thread-private, we can inherit the
       logging already done.  No ITM_W* instrumentation necessary.  */
    *p3 = 555;
    }
  }
  return p3[something()];
}

/* { dg-final { scan-tree-dump-times "ITM_WU" 0 "tmmark" } } */
/* { dg-final { cleanup-tree-dump "tmmark" } } */

--- CUT ---

It currently fails because the aliasing code does not understand that p3 cannot
alias only local memory.

I found this while adding support to phiopt to convert some phi's into
COND_EXPR.