From 0835f40ae25f97360dc393928796387d3cd6b16e Mon Sep 17 00:00:00 2001
From: Guilherme Andrade <g@gandrade.net>
Date: Wed, 19 Apr 2017 00:43:37 +0100
Subject: erts: Add enif_phash2 and enif_phash2_ranged

These allow one to hash VM terms from NIF code.
---
 erts/emulator/beam/utils.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'erts/emulator/beam/utils.c')

diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 8f3f48f38f..72c59b33c6 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -1552,6 +1552,16 @@ make_hash2(Eterm term)
     }
 }
 
+Uint32
+make_hash2_within_range(Eterm term, Uint32 range)
+{
+    Uint32 hash = make_hash2(term);
+    if (range)
+        return hash % range; /* [0..range-1] */
+    else
+        return hash; /* Special case: 2**32 */
+}
+
 /* Term hash function for internal use.
  *
  * Limitation #1: Is not "portable" in any way between different VM instances.
-- 
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