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flow.c (split_edge): Don't allocate global_live_at_start for the new block unless... 

* flow.c (split_edge): Don't allocate global_live_at_start for
        the new block unless the old blocks had them as well.

From-SVN: r33735
This commit is contained in:
Richard Henderson 2000-05-06 14:35:35 -07:00 committed by Richard Henderson
parent e117276e04
commit 6482ee510f
2 changed files with 7 additions and 7 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-05-06 Richard Henderson <rth@cygnus.com>
* flow.c (split_edge): Don't allocate global_live_at_start for
the new block unless the old blocks had them as well.
2000-05-06 Zack Weinberg <zack@wolery.cumb.org>
* cpphash.h: Remove conditional #define of __extension__.

9
gcc/flow.c
View File

@ -1349,20 +1349,15 @@ split_edge (edge_in)
n_edges++;
memset (bb, 0, sizeof (*bb));
bb->global_live_at_start = OBSTACK_ALLOC_REG_SET (function_obstack);
bb->global_live_at_end = OBSTACK_ALLOC_REG_SET (function_obstack);
/* ??? This info is likely going to be out of date very soon. */
if (old_succ->global_live_at_start)
{
bb->global_live_at_start = OBSTACK_ALLOC_REG_SET (function_obstack);
bb->global_live_at_end = OBSTACK_ALLOC_REG_SET (function_obstack);
COPY_REG_SET (bb->global_live_at_start, old_succ->global_live_at_start);
COPY_REG_SET (bb->global_live_at_end, old_succ->global_live_at_start);
}
else
{
CLEAR_REG_SET (bb->global_live_at_start);
CLEAR_REG_SET (bb->global_live_at_end);
}
/* Wire them up. */
bb->pred = edge_in;