ilog: rework to reduce interface.

[ccan] / ccan / ilog / test / run-out-of-line.c

diff --git a/ccan/ilog/test/run-out-of-line.c b/ccan/ilog/test/run-out-of-line.c
new file mode 100644 (file)
index 0000000..48205d3
--- /dev/null
+++ b/ccan/ilog/test/run-out-of-line.c
@@ -0,0 +1,65 @@
+#include <ccan/ilog/ilog.h>
+#include <ccan/ilog/ilog.c>
+#include <stdio.h>
+#include <ccan/tap/tap.h>
+
+/*Dead simple (but slow) versions to compare against.*/
+
+static int test_ilog32(uint32_t _v){
+  int ret;
+  for(ret=0;_v;ret++)_v>>=1;
+  return ret;
+}
+
+static int test_ilog64(uint64_t _v){
+  int ret;
+  for(ret=0;_v;ret++)_v>>=1;
+  return ret;
+}
+
+#define NTRIALS (64)
+
+int main(int _argc,const char *_argv[]){
+  int i;
+  int j;
+  int (*il32)(uint32_t) = ilog32;
+  int (*il64)(uint64_t) = ilog64;
+  int (*il32_nz)(uint32_t) = ilog32_nz;
+  int (*il64_nz)(uint64_t) = ilog64_nz;
+
+  /*This is how many tests you plan to run.*/
+  plan_tests(33 * NTRIALS * 3 + 65 * NTRIALS * 3);
+  for(i=0;i<=32;i++){
+    uint32_t v;
+    /*Test each bit in turn (and 0).*/
+    v=i?(uint32_t)1U<<(i-1):0;
+    for(j=0;j<NTRIALS;j++){
+      int l;
+      l=test_ilog32(v);
+      ok1(STATIC_ILOG_32(v)==l);
+      ok1(il32(v)==l);
+      ok1(il32_nz(v) == l || v == 0);
+      /*Also try a few more pseudo-random values with at most the same number
+         of bits.*/
+      v=(1103515245U*v+12345U)&0xFFFFFFFFU>>((33-i)>>1)>>((32-i)>>1);
+    }
+  }
+
+  for(i=0;i<=64;i++){
+    uint64_t v;
+    /*Test each bit in turn (and 0).*/
+    v=i?(uint64_t)1U<<(i-1):0;
+    for(j=0;j<NTRIALS;j++){
+      int l;
+      l=test_ilog64(v);
+      ok1(STATIC_ILOG_64(v)==l);
+      ok1(il64(v)==l);
+      ok1(il64_nz(v) == l || v == 0);
+      /*Also try a few more pseudo-random values with at most the same number
+         of bits.*/
+      v=(uint64_t)((2862933555777941757ULL*v+3037000493ULL)
+       &0xFFFFFFFFFFFFFFFFULL>>((65-i)>>1)>>((64-i)>>1));
+    }
+  }
+  return exit_status();
+}