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-rw-r--r--erts/emulator/beam/erl_bif_lists.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_bif_lists.c b/erts/emulator/beam/erl_bif_lists.c
index aaf262780f..b69949f9cc 100644
--- a/erts/emulator/beam/erl_bif_lists.c
+++ b/erts/emulator/beam/erl_bif_lists.c
@@ -244,12 +244,25 @@ typedef struct {
#define ERTS_RBT_GET_LEFT(T) ((T)->left)
#define ERTS_RBT_SET_LEFT(T, L) ((T)->left = (L))
#define ERTS_RBT_GET_KEY(T) ((T)->key)
-#define ERTS_RBT_CMP_KEYS(KX, KY) CMP_TERM(KX, KY)
+#define ERTS_RBT_CMP_KEYS(KX, KY) subtract_term_cmp((KX), (KY))
#define ERTS_RBT_WANT_LOOKUP_INSERT
#define ERTS_RBT_WANT_LOOKUP
#define ERTS_RBT_WANT_DELETE
#define ERTS_RBT_UNDEF
+/* erl_rbtree expects comparisons to return an int */
+static int subtract_term_cmp(Eterm a, Eterm b) {
+ Sint res = CMP_TERM(a, b);
+
+ if (res < 0) {
+ return -1;
+ } else if (res > 0) {
+ return 1;
+ }
+
+ return 0;
+}
+
#include "erl_rbtree.h"
static int subtract_continue(Process *p, ErtsSubtractContext *context);