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global.c (prune_preferences): Move some invariants out of the inner loop.

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* global.c (prune_preferences): Move some invariants out of the
	inner loop.

From-SVN: r28691
This commit is contained in:
J"orn Rennecke 1999-08-12 22:53:28 +00:00 committed by Joern Rennecke
parent 7bc699731b
commit ea1637e9e5
2 changed files with 16 additions and 9 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Thu Aug 12 23:51:04 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
* global.c (prune_preferences): Move some invariants out of the
inner loop.
Thu Aug 12 15:30:29 1999 Jesse Perry (jap@unx.dec.com)
* configure.in (alpha*-dec-osf*): Add osf5.

20
gcc/global.c
View File

@ -864,7 +864,7 @@ prune_preferences ()
for (i = max_allocno - 1; i >= 0; i--)
{
HARD_REG_SET temp;
HARD_REG_SET temp, temp2;
allocno = allocno_order[i];
COPY_HARD_REG_SET (temp, hard_reg_conflicts[allocno]);
@ -882,25 +882,27 @@ prune_preferences ()
AND_COMPL_HARD_REG_SET (hard_reg_copy_preferences[allocno], temp);
AND_COMPL_HARD_REG_SET (hard_reg_full_preferences[allocno], temp);
CLEAR_HARD_REG_SET (regs_someone_prefers[allocno]);
/* Merge in the preferences of lower-priority registers (they have
already been pruned). If we also prefer some of those registers,
don't exclude them unless we are of a smaller size (in which case
we want to give the lower-priority allocno the first chance for
these registers). */
CLEAR_HARD_REG_SET (temp);
CLEAR_HARD_REG_SET (temp2);
for (j = i + 1; j < max_allocno; j++)
if (CONFLICTP (allocno, allocno_order[j])
|| CONFLICTP (allocno_order[j], allocno))
{
COPY_HARD_REG_SET (temp,
hard_reg_full_preferences[allocno_order[j]]);
if (allocno_size[allocno_order[j]] <= allocno_size[allocno])
AND_COMPL_HARD_REG_SET (temp,
hard_reg_full_preferences[allocno]);
IOR_HARD_REG_SET (regs_someone_prefers[allocno], temp);
IOR_HARD_REG_SET (temp,
hard_reg_full_preferences[allocno_order[j]]);
else
IOR_HARD_REG_SET (temp2,
hard_reg_full_preferences[allocno_order[j]]);
}
AND_COMPL_HARD_REG_SET (temp, hard_reg_full_preferences[allocno]);
IOR_HARD_REG_SET (temp, temp2);
COPY_HARD_REG_SET (regs_someone_prefers[allocno], temp);
}
}