attempt to create test that uses ctlz.v2i64 (currently failed)

compiler-rt/test/msan/counting_zeroes.c

+// unsupported: c++03, c++11, c++14, c++17
+
+// RUN: %clang_msan %s -o %t && %run %t %p
+
+#ifdef kda_COMMENTED_OUT
+#include <bit>
+#include "int_lib.h"
+#include "sanitizer_common.h"
+#endif  /* kda_COMMENTED_OUT */
+
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+uint64_t foo(int64_t* x) {
+#ifdef kda_COMMENTED_OUT
+  uint64_t res = __builtin_clzll(((uint64_t)(x[0]) << 1) ^ (uint64_t)(x[0] >> 63));
+#endif  /* kda_COMMENTED_OUT */
+  volatile uint64_t encoded = ((uint64_t)(*x) << 1) ^ (uint64_t)(*x >> 63);
+#ifdef kda_COMMENTED_OUT
+  volatile uint64_t encoded = (*(uint64_t*)(x) << 1) ^ (*(uint64_t*)(x) >> 63);
+#endif  /* kda_COMMENTED_OUT */
+  uint64_t res = __builtin_clzll(encoded | 1) - 1;
+#ifdef kda_COMMENTED_OUT
+  uint64_t res = __builtin_clzll(*x);
+#endif  /* kda_COMMENTED_OUT */
+  return res;
+}
+
+void setValue(void* memory, int index, int64_t value) {
+  ((int64_t*)memory)[index] = value;
+}
+
+
+int main() {
+#ifdef kda_COMMENTED_OUT
+  int64_t x[] = {5, 6};
+#endif  /* kda_COMMENTED_OUT */
+
+#ifdef kda_COMMENTED_OUT
+  void* x = malloc(2 * sizeof(int64_t));
+  setValue(x, 0, 5);
+#endif  /* kda_COMMENTED_OUT */
+
+  __int128 x;
+#ifdef kda_COMMENTED_OUT
+  ((int64_t*)(&x))[0] = 5;
+#endif  /* kda_COMMENTED_OUT */
+  x = 5;
+
+
+  __int128 res = __builtin_clzll(x);
+#ifdef kda_COMMENTED_OUT
+  uint64_t res = __builtin_clzll(((int64_t*)x)[0]);
+#endif  /* kda_COMMENTED_OUT */
+#ifdef kda_COMMENTED_OUT
+  uint64_t res = __builtin_clzll(x);
+#endif  /* kda_COMMENTED_OUT */
+#ifdef kda_COMMENTED_OUT
+  uint64_t res = __builtin_clzll(((int64_t*)x)[0]);
+#endif  /* kda_COMMENTED_OUT */
+#ifdef kda_COMMENTED_OUT
+  uint64_t res;
+  res = foo(&x);
+#endif  /* kda_COMMENTED_OUT */
+#ifdef kda_COMMENTED_OUT
+  printf("res: %lu\n", res);
+  res = foo(((int64_t*)x)[1]);
+  printf("res: %lu\n", res);
+  assert(res == 60);
+#endif  /* kda_COMMENTED_OUT */
+  return 0;
+}