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(reload): If only non-group need is unfilled, see if 

regs spilled for earlier classes can satisfy it.

From-SVN: r4597
This commit is contained in:
Richard Stallman 1993-05-30 23:41:55 +00:00
parent 5cf460ff62
commit 9a6cde3a01
1 changed files with 29 additions and 0 deletions
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29
gcc/reload1.c
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@ -1785,6 +1785,35 @@ reload (first, global, dumpfile)
while (max_needs[class] > 0 || max_nongroups[class] > 0)
{
#ifdef SMALL_REGISTER_CLASSES
/* This should be right for all machines, but only the 386
is known to need it, so this conditional plays safe.
??? For 2.5, try making this unconditional. */
/* If we spilled enough regs, but they weren't counted
against the non-group need, see if we can count them now.
If so, we can avoid some actual spilling. */
if (max_needs[class] <= 0 && max_nongroups[class] > 0)
for (i = 0; i < n_spills; i++)
if (TEST_HARD_REG_BIT (reg_class_contents[class],
spill_regs[i])
&& !TEST_HARD_REG_BIT (counted_for_groups,
spill_regs[i])
&& !TEST_HARD_REG_BIT (counted_for_nongroups,
spill_regs[i])
&& max_nongroups[class] > 0)
{
register enum reg_class *p;
SET_HARD_REG_BIT (counted_for_nongroups, spill_regs[i]);
max_nongroups[class]--;
p = reg_class_superclasses[class];
while (*p != LIM_REG_CLASSES)
max_nongroups[(int) *p++]--;
}
if (max_needs[class] <= 0 && max_nongroups[class] <= 0)
break;
#endif
/* Consider the potential reload regs that aren't
yet in use as reload regs, in order of preference.
Find the most preferred one that's in this class. */