From 3d1b66a35e1ab3be19335705f310b278d76d66d2 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sat, 4 Aug 2012 17:42:28 -0700
Subject: [PATCH] Speed up hb_set_digest_common_bits_t calcs

---
 src/hb-set-private.hh | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/hb-set-private.hh b/src/hb-set-private.hh
index 550b7f21..8beff37d 100644
--- a/src/hb-set-private.hh
+++ b/src/hb-set-private.hh
@@ -54,9 +54,9 @@ struct hb_set_digest_common_bits_t
   }
 
   inline void add_range (hb_codepoint_t a, hb_codepoint_t b) {
-    /* TODO Speedup. */
-    for (unsigned int i = a; i < b + 1; i++)
-      add (i);
+    /* The negation here stands for ~(x-1). */
+    mask &= -(1 << _hb_bit_storage (a ^ b));
+    value &= mask;
   }
 
   inline bool may_have (hb_codepoint_t g) const {
-- 
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