gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / libiberty / fibheap.c

diff --git a/libiberty/fibheap.c b/libiberty/fibheap.c
index c032149c0c24fc9639d9c56725691e9d4035aed8..b89722810069f3d3532f2c1a990b2f9cade171d2 100644 (file)
--- a/libiberty/fibheap.c
+++ b/libiberty/fibheap.c
@@ -1,5 +1,5 @@
 /* A Fibonacci heap datatype.
-   Copyright 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1998-2020 Free Software Foundation, Inc.
    Contributed by Daniel Berlin (dan@cgsoftware.com).
    
 This file is part of GNU CC.
@@ -214,7 +214,10 @@ fibheap_replace_key_data (fibheap_t heap, fibnode_t node,
   node->key = key;
   y = node->parent;
 
-  if (okey == key)
+  /* Short-circuit if the key is the same, as we then don't have to
+     do anything.  Except if we're trying to force the new node to
+     be the new minimum for delete.  */
+  if (okey == key && okey != FIBHEAPKEY_MIN)
     return odata;
 
   /* These two compares are specifically <= 0 to make sure that in the case
@@ -256,6 +259,11 @@ fibheap_delete_node (fibheap_t heap, fibnode_t node)
 
   /* To perform delete, we just make it the min key, and extract.  */
   fibheap_replace_key (heap, node, FIBHEAPKEY_MIN);
+  if (node != heap->min)
+    {
+      fprintf (stderr, "Can't force minimum on fibheap.\n");
+      abort ();
+    }
   fibheap_extract_min (heap);
 
   return ret;