[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 7580339dba221f8f32adce93446b002b9ef7925c..2b9d940c8064e705cf7bfd27dd674f2e4780dc71 100644 (file)
--- 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;
 }