[Bug middle-end/27946] New: double to long long and back to double stores to the stack

[pinskia at gcc dot gnu dot org]

Testcase:
void f(double a, double *b)
{
  long long c = a;
  *b = c;
}

-----
We currently get:
_f:
        fctidz f1,f1
        fcfid f0,f1
        stfd f1,-16(r1) ; <--- not needed
        stfd f0,0(r4)
        blr

--------
On the Yara branch we get:
        fctidz f0,f1
        fcfid f0,f0
        stfd f0,0(r4)
        blr

So this is a RA issue, I am recording this to make sure that the next ra that
goes in as default actually fixes it.


-- 
           Summary: double to long long and back to double stores to the
                    stack
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, ra
          Severity: enhancement
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc64-*-*
OtherBugsDependingO 18427
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27946