optimize __mg_get_nr_idle_slots

2026-09-24 00:54:18 +08:00 · 2021-03-28 21:13:05 +08:00
parent 4d1077b759
commit 666fba74cd
1 changed files with 20 additions and 3 deletions
@@ -151,12 +151,29 @@ size_t __mg_get_nr_idle_slots (unsigned char* bitmap, size_t len_bmp)
    size_t i, j;

    for (i = 0; i < len_bmp; i++) {
-        for (j = 0; j < 8; j++) {
-            if (*bitmap & (0x80 >> j))
-                idle++;
+        if (*bitmap) {
+            if (*bitmap == 0xFF) {
+                idle += 8;
+            }
+            else {
+                if (*bitmap & 0xF0) {
+                    for (j = 0; j < 4; j++) {
+                        if (*bitmap & (0x80 >> j))
+                            idle++;
+                    }
+                }
+                if (*bitmap & 0x0F) {
+                    for (j = 0; j < 4; j++) {
+                        if (*bitmap & (0x08 >> j))
+                            idle++;
+                    }
+                }
+            }
        }
+
        bitmap++;
    }
+
    return idle;
 }