From: Clemens Ladisch <clemens@ladisch.de>
Date: Mon, 27 Feb 2006 08:53:03 +0000 (+0100)
Subject: [ALSA] usb-audio: optimize snd_usbmidi_count_bits()
X-Git-Tag: v2.6.17-rc1~1129^2^2~67
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=62f09c3d321c82981ae3f2dd7e32bc4c73379a7e;p=linux-2.6-omap-h63xx.git

[ALSA] usb-audio: optimize snd_usbmidi_count_bits()

Modules: USB generic driver

Reduce the code size of the snd_usbmidi_count_bits() function by using
simpler operations.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 7580339dba2..2b9d940c806 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -871,10 +871,10 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi* umidi,
 
 static unsigned int snd_usbmidi_count_bits(unsigned int x)
 {
-	unsigned int bits = 0;
+	unsigned int bits;
 
-	for (; x; x >>= 1)
-		bits += x & 1;
+	for (bits = 0; x; ++bits)
+		x &= x - 1;
 	return bits;
 }