On 10/19/09 12:30, Ian Bolton wrote:
Hi Jeff and Vladimir.
Jeff: I'd be interested in trying the patch if you can send it my way.
It's nothing special.
/* Return nonzero if REGNO is a particularly bad choice for reloading X. */
static int
ira_bad_reload_regno_1 (int regno, rtx x)
{
int x_regno;
ira_allocno_t a;
enum reg_class pref;
/* We only deal with pseudo regs. */
if (! x || GET_CODE (x) != REG)
return 0;
x_regno = REGNO (x);
if (x_regno < FIRST_PSEUDO_REGISTER)
return 0;
/* If the pseudo prefers REGNO explicitly, then do not consider
REGNO a bad spill choice. */
pref = reg_preferred_class (x_regno);
if (reg_class_size[pref] == 1
&& TEST_HARD_REG_BIT (reg_class_contents[pref], regno))
return 0;
/* If the pseudo conflicts with REGNO, then we consider REGNO a
poor choice for a reload regno. */
a = ira_regno_allocno_map[x_regno];
if (TEST_HARD_REG_BIT (ALLOCNO_TOTAL_CONFLICT_HARD_REGS (a), regno))
return 1;
return 0;
}
/* Return nonzero if REGNO is a particularly bad choice for reloading
IN or OUT. */
int
ira_bad_reload_regno (int regno, rtx in, rtx out)
{
return (ira_bad_reload_regno_1 (regno, in)
|| ira_bad_reload_regno_1 (regno, out));
}
Then change the loop in allocate_reload_reg to iterate 3 times intead of
2. And add this fragment
if (pass == 1
&& ira_bad_reload_regno (regnum, rld[r].in, rld[r].out))
continue;
To body of hte conditional starting with
if ((reload_reg_free_p ...
It's really just a hack. I don't want to spend much time on that code
as ultimately I want it all to go away.
Jeff
