(setup_save_areas): Don't assign save area for a group if some

register in the group has already been assigned an area.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@3000 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 12 insertions, 0 deletions

diff --git a/gcc/caller-save.c b/gcc/caller-save.c
index f77eda9ae06..6687c66a706 100644
--- a/gcc/caller-save.c
+++ b/gcc/caller-save.c
@@ -314,12 +314,24 @@ setup_save_areas (pchanged)
     for (j = MOVE_MAX / UNITS_PER_WORD; j > 0; j--)
       {
 	int ok = 1;
+	int do_save;
 
 	/* If no mode exists for this size, try another.  Also break out
 	   if we have already saved this hard register.  */
 	if (regno_save_mode[i][j] == VOIDmode || regno_save_mem[i][1] != 0)
 	  continue;
 
+	/* See if any register in this group has been saved.  */
+	do_save = 1;
+	for (k = 0; k < j; k++)
+	  if (regno_save_mem[i + k][1])
+	    {
+	      do_save = 0;
+	      break;
+	    }
+	if (! do_save)
+	  continue;
+
 	for (k = 0; k < j; k++)
 	    {
 	      int regno = i + k;