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| author | Richard Stallman <rms@gnu.org> | 1993-11-10 00:39:17 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1993-11-10 00:39:17 +0000 |
| commit | 92b0556de3f14fcc8c10fde3b66f8dac95258b8e (patch) | |
| tree | 81c8f235b942e9c25b7545b7ff497322e3bfea7e | |
| parent | 43a674af6f5e38f72c8b90640415ca467981e8ba (diff) | |
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(reload) [SMALL_REGISTER_CLASSES]: Try, at least,
to avoid 2-groups whose second register is explicitly used.
From-SVN: r6047
| -rw-r--r-- | gcc/reload1.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gcc/reload1.c b/gcc/reload1.c index 33f118b..542c9d7 100644 --- a/gcc/reload1.c +++ b/gcc/reload1.c @@ -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++) { |