* reload1.c (calculate_needs_all_insns): If deleting an instruction,

	remove its insn_chain structure as well.

	* gcc.dg/20001009-1.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@36824 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 13 insertions, 2 deletions

diff --git a/gcc/reload1.c b/gcc/reload1.c
index c556265f312..803fd010faf 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -1330,15 +1330,17 @@ calculate_needs_all_insns (global)
      int global;
 {
   struct insn_chain **pprev_reload = &insns_need_reload;
-  struct insn_chain *chain;
+  struct insn_chain *chain, *next = 0;
 
   something_needs_elimination = 0;
 
   reload_insn_firstobj = (char *) obstack_alloc (&reload_obstack, 0);
-  for (chain = reload_insn_chain; chain != 0; chain = chain->next)
+  for (chain = reload_insn_chain; chain != 0; chain = next)
     {
       rtx insn = chain->insn;
 
+      next = chain->next;
+
       /* Clear out the shortcuts.  */
       chain->n_reloads = 0;
       chain->need_elim = 0;
@@ -1394,6 +1396,15 @@ calculate_needs_all_insns (global)
 		  PUT_CODE (insn, NOTE);
 		  NOTE_SOURCE_FILE (insn) = 0;
 		  NOTE_LINE_NUMBER (insn) = NOTE_INSN_DELETED;
+		  /* Delete it from the reload chain */
+		  if (chain->prev)
+		    chain->prev->next = next;
+		  else
+		    reload_insn_chain = next;
+		  if (next)
+		    next->prev = chain->prev;
+		  chain->next = unused_insn_chains;
+		  unused_insn_chains = chain;
 		  continue;
 		}
 	    }