nv50: Extract needed value bits without shifting them before calling bitcount

This can save one instruction since bitcount doesn't care about specific
bits' positions.

Reviewed-by: Karol Herbst <kherbst@redhat.com>

diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 1db112f..b278a2f 100644 (file)
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -992,7 +992,7 @@ nv50_screen_create(struct nouveau_device *dev)
    nouveau_getparam(dev, NOUVEAU_GETPARAM_GRAPH_UNITS, &value);
 
    screen->TPs = util_bitcount(value & 0xffff);
-   screen->MPsInTP = util_bitcount((value >> 24) & 0xf);
+   screen->MPsInTP = util_bitcount(value & 0x0f000000);
 
    screen->mp_count = screen->TPs * screen->MPsInTP;