ref: 6e44f3442f1aaf7ef3a201e365529d25c9cecc6c dir: /src/plan9/clz.c/
#include "platform.h" int sl_clz(u32int x) { u32int r; if(x == 0) return 32; for(r = 0; (x & (1UL<<31)) == 0; x <<= 1, r++); return r; }