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authorPekka Paalanen <[email protected]>2008-12-13 23:24:39 +0200
committerPekka Paalanen <[email protected]>2008-12-13 23:24:39 +0200
commitf72848a09a9d3069705fbe8e4daa29b9918ea56e (patch)
tree2aa40f4523fa5c55a0680e59fc052bd188fc4a34 /src/gallium/drivers/nouveau
parent079116e6a487988c7f0411f60c652bb29d69b488 (diff)
Nouveau: move the definition of log2i() to header
Also make the type unsigned instead of signed, since negative values do not make sense. Signed-off-by: Pekka Paalanen <[email protected]>
Diffstat (limited to 'src/gallium/drivers/nouveau')
-rw-r--r--src/gallium/drivers/nouveau/nouveau_util.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/gallium/drivers/nouveau/nouveau_util.h b/src/gallium/drivers/nouveau/nouveau_util.h
index c92041ebeba..a10114beab9 100644
--- a/src/gallium/drivers/nouveau/nouveau_util.h
+++ b/src/gallium/drivers/nouveau/nouveau_util.h
@@ -61,4 +61,31 @@ nouveau_vbuf_split(unsigned remaining, unsigned overhead, unsigned vpp,
return max;
}
+/* Integer base-2 logarithm, rounded towards zero. */
+static INLINE unsigned log2i(unsigned i)
+{
+ unsigned r = 0;
+
+ if (i & 0xffff0000) {
+ i >>= 16;
+ r += 16;
+ }
+ if (i & 0x0000ff00) {
+ i >>= 8;
+ r += 8;
+ }
+ if (i & 0x000000f0) {
+ i >>= 4;
+ r += 4;
+ }
+ if (i & 0x0000000c) {
+ i >>= 2;
+ r += 2;
+ }
+ if (i & 0x00000002) {
+ r += 1;
+ }
+ return r;
+}
+
#endif