Re: [Qemu-devel] [PULL 3/7] qxl: refactor rounding up to a nearest power of 2

[Dongsheng Song]

On Wed, Mar 4, 2015 at 10:30 PM, Gerd Hoffmann <address@hidden> wrote:

+/* round up to the nearest power of 2 (0 if overflow) */
+uint64_t pow2ceil(uint64_t value)
+{
+    uint8_t nlz = clz64(value);
+
+    if (is_power_of_2(value)) {
+        return value;
+    }
+    if (!nlz) {
+        return 0;
+    }
+    return 1ULL << (64 - nlz);
+}
+

please call clz64 after is_power_of_2.