From 08ea98c9e9f32288d21a0caf8362342f500dcc21 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Tue, 6 May 2014 10:19:51 +0200
Subject: Scripting: replace tolower() with faster code in
 evalGenericCommand().

The function showed up consuming a non trivial amount of time in the
profiler output. After this change benchmarking gives a 6% speed
improvement that can be consistently measured.
---
 src/scripting.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/scripting.c b/src/scripting.c
index e28662db1..8eddb2a5e 100644
--- a/src/scripting.c
+++ b/src/scripting.c
@@ -861,8 +861,12 @@ void evalGenericCommand(redisClient *c, int evalsha) {
         int j;
         char *sha = c->argv[1]->ptr;
 
+        /* Convert to lowercase. We don't use tolower since the function
+         * managed to always show up in the profiler output consuming
+         * a non trivial amount of time. */
         for (j = 0; j < 40; j++)
-            funcname[j+2] = tolower(sha[j]);
+            funcname[j+2] = (sha[j] >= 'A' && sha[j] <= 'Z') ?
+                sha[j]+('a'-'A') : sha[j];
         funcname[42] = '\0';
     }
 
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