Try to rescue Windows builds

Author: ridiculousfish

test/benchmark_divlu.c

@@ -6,7 +6,13 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#else
 #include <time.h>
+#endif
 
 uint32_t divlu(uint32_t numhi, uint32_t numlo, uint32_t den, uint32_t *r);
 uint64_t divllu(uint64_t numhi, uint64_t numlo, uint64_t den, uint64_t *r);
@@ -16,11 +22,23 @@ uint64_t divllu(uint64_t numhi, uint64_t numlo, uint64_t den, uint64_t *r);
 
 typedef unsigned long long ullong;
 
+#ifdef _WIN32
+static uint64_t now_ns(void) {
+    static LARGE_INTEGER freq = {0};
+    LARGE_INTEGER counter;
+    if (freq.QuadPart == 0) {
+        QueryPerformanceFrequency(&freq);
+    }
+    QueryPerformanceCounter(&counter);
+    return (uint64_t)(counter.QuadPart * 1000000000ULL / freq.QuadPart);
+}
+#else
 static uint64_t now_ns(void) {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);
     return (uint64_t)ts.tv_sec * UINT64_C(1000000000) + (uint64_t)ts.tv_nsec;
 }
+#endif
 
 // xorshift64 RNG.
 static uint64_t rng = UINT64_C(0x1234567890ABCDEF);