[PATCH 1/1] gcc/ira-build.c: save a conflict obj compare in ira_flattening

[Zhouyi Zhou]

In function ira_flattening, conflict relationship will be rebuilt in case
of any new pseudo register has been created during ira_emit.

By adding the current object to OBJECTS_LIVE after traversing OBJECTS_LIVE, a 
conflict
obj compare can be saved.


Bootstraped and regtested in x86_64 Linux 
Signed-off-by: Zhouyi Zhou <yizhouz...@ict.ac.cn>
---
 gcc/ChangeLog   |    5 +++++
 gcc/ira-build.c |    2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e5d16f9..c0ce758 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-22  Zhouyi Zhou <yizhouz...@ict.ac.cn>
+
+       * ira-build.c (ira_flattening): Add the current
+       object to OBJECTS_LIVE after traversing OBJECTS_LIVE.
+       
 2014-12-17  Oleg Endo  <olege...@gcc.gnu.org>
 
        PR target/55212
diff --git a/gcc/ira-build.c b/gcc/ira-build.c
index af82b71..66318096 100644
--- a/gcc/ira-build.c
+++ b/gcc/ira-build.c
@@ -3252,7 +3252,6 @@ ira_flattening (int max_regno_before_emit, int 
ira_max_point_before_emit)
                continue;
 
              aclass = ALLOCNO_CLASS (a);
-             sparseset_set_bit (objects_live, OBJECT_CONFLICT_ID (obj));
              EXECUTE_IF_SET_IN_SPARSESET (objects_live, n)
                {
                  ira_object_t live_obj = ira_object_id_map[n];
@@ -3264,6 +3263,7 @@ ira_flattening (int max_regno_before_emit, int 
ira_max_point_before_emit)
                      && live_a != a)
                    ira_add_conflict (obj, live_obj);
                }
+             sparseset_set_bit (objects_live, OBJECT_CONFLICT_ID (obj));
            }
 
          for (r = ira_finish_point_ranges[i]; r != NULL; r = r->finish_next)
-- 
1.7.10.4