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(reload) [SMALL_REGISTER_CLASSES]: Try, at least, 

to avoid 2-groups whose second register is explicitly used.

From-SVN: r6047
This commit is contained in:
Richard Stallman 1993-11-10 00:39:17 +00:00
parent 43a674af6f
commit 92b0556de3
1 changed files with 28 additions and 0 deletions
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28
gcc/reload1.c
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@ -1695,6 +1695,34 @@ reload (first, global, dumpfile)
}
}
/* We can't complete a group, so start one. */
#ifdef SMALL_REGISTER_CLASSES
/* Look for a pair neither of which is explicitly used. */
if (i == FIRST_PSEUDO_REGISTER)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
int k;
j = potential_reload_regs[i];
/* Verify that J+1 is a potential reload reg. */
for (k = 0; k < FIRST_PSEUDO_REGISTER; k++)
if (potential_reload_regs[k] == j + 1)
break;
if (j >= 0 && j + 1 < FIRST_PSEUDO_REGISTER
&& k < FIRST_PSEUDO_REGISTER
&& spill_reg_order[j] < 0 && spill_reg_order[j + 1] < 0
&& TEST_HARD_REG_BIT (reg_class_contents[class], j)
&& TEST_HARD_REG_BIT (reg_class_contents[class], j + 1)
&& HARD_REGNO_MODE_OK (j, group_mode[class])
&& ! TEST_HARD_REG_BIT (counted_for_nongroups,
j + 1)
&& ! TEST_HARD_REG_BIT (bad_spill_regs, j + 1)
/* Reject J at this stage
if J+1 was explicitly used. */
&& ! regs_explicitly_used[j + 1])
break;
}
#endif
/* Now try any group at all
whose registers are not in bad_spill_regs. */
if (i == FIRST_PSEUDO_REGISTER)
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{