[Bug target/54009] New: incorrect code generated for DFmode lo_sum mem

[amodra at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54009

             Bug #: 54009
           Summary: incorrect code generated for DFmode lo_sum mem
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: amo...@gmail.com


/* -O2 -m32 store to x.d in w uses
    lis 9,x+32764@ha
    stw 10,x+32764@l(9)
    stw 11,x+32768@l(9)  <--  wrap!  */

struct big {
  char a[32764];
  double d __attribute__ ((aligned (4)));
} __attribute__ ((packed));

extern struct big x;
double y;

void r (void)
{
  double tmp = x.d;
#if 1
  asm ("#": "+r" (tmp)
       : : "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7",
           "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15",
           "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", "fr22", "fr23",
           "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", "fr30", "fr31");
#endif
  y = tmp;
}

void w (void)
{
  double tmp = y;
#if 1
  asm ("#": "+r" (tmp)
       : : "fr0", "fr1", "fr2", "fr3", "fr4", "fr5", "fr6", "fr7",
           "fr8", "fr9", "fr10", "fr11", "fr12", "fr13", "fr14", "fr15",
           "fr16", "fr17", "fr18", "fr19", "fr20", "fr21", "fr22", "fr23",
           "fr24", "fr25", "fr26", "fr27", "fr28", "fr29", "fr30", "fr31");
#endif
  x.d = tmp;
}