GNU bug report logs - #48264
28.0.50; Changing the default for DEFVAR_PER_BUFFER variables takes O(#buffers) time

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From: Spencer Baugh <sbaugh <at> catern.com>
To: 48264 <at> debbugs.gnu.org
Cc: Spencer Baugh <sbaugh <at> catern.com>
Subject: bug#48264: [PATCH v3 04/15] Combine unnecessarily separate loops in buffer.c
Date: Thu,  6 May 2021 17:33:35 -0400

These loops iterate over the same things with the same check.

* src/buffer.c (reset_buffer_local_variables): Combine loops
---
 src/buffer.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/buffer.c b/src/buffer.c
index 3427022ace..c2a268adec 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1006,7 +1006,7 @@ reset_buffer (register struct buffer *b)
 static void
 reset_buffer_local_variables (struct buffer *b, bool permanent_too)
 {
-  int offset, i;
+  int offset;
 
   /* Reset the major mode to Fundamental, together with all the
      things that depend on the major mode.
@@ -1100,10 +1100,6 @@ reset_buffer_local_variables (struct buffer *b, bool permanent_too)
         }
     }
 
-  for (i = 0; i < last_per_buffer_idx; ++i)
-    if (permanent_too || buffer_permanent_local_flags[i] == 0)
-      SET_PER_BUFFER_VALUE_P (b, i, 0);
-
   /* For each slot that has a default value, copy that into the slot.  */
   FOR_EACH_PER_BUFFER_OBJECT_AT (offset)
     {
@@ -1111,7 +1107,10 @@ reset_buffer_local_variables (struct buffer *b, bool permanent_too)
       if ((BUFFER_DEFAULT_VALUE_P (offset)
 	   && (permanent_too
 	       || buffer_permanent_local_flags[idx] == 0)))
-	set_per_buffer_value (b, offset, per_buffer_default (offset));
+        {
+          SET_PER_BUFFER_VALUE_P (b, idx, 0);
+          set_per_buffer_value (b, offset, per_buffer_default (offset));
+        }
     }
 }
 
-- 
2.31.1

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