setup.c: rewrite `__fls()`
Rewrite handmade `__fls()`: use `__builtin_clz()`.
Also add `inline` specifier.
@@ -211,33 +211,11 @@ void io_uring_free_probe(struct io_uring_probe *probe)
free(probe);
}
-static int __fls(int x)
+static inline int __fls(int x)
{
- int r = 32;
-
if (!x)
return 0;
- if (!(x & 0xffff0000u)) {
- x <<= 16;
- r -= 16;
- }
- if (!(x & 0xff000000u)) {
- x <<= 8;
- r -= 8;
- }
- if (!(x & 0xf0000000u)) {
- x <<= 4;
- r -= 4;
- }
- if (!(x & 0xc0000000u)) {
- x <<= 2;
- r -= 2;
- }
- if (!(x & 0x80000000u)) {
- x <<= 1;
- r -= 1;
- }
- return r;
+ return 8 * sizeof(x) - __builtin_clz(x);
}
static unsigned roundup_pow2(unsigned depth)
