X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmisc.h;h=373f1b77c76ed0fbdf6a912abf267ad4703a6ef0;hp=9d53c2dab129220f37bf01f273db05048f0fb97b;hb=208c53df0fc289466def7deae58f687957efb734;hpb=d4763424d2728fe2dfd0a6fe747666feb6a2fdbb

diff --git a/src/misc.h b/src/misc.h
index 9d53c2da..373f1b77 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -34,7 +34,7 @@ const std::string compiler_info();
 void prefetch(void* addr);
 void start_logger(const std::string& fname);
 void* aligned_ttmem_alloc(size_t size, void*& mem);
-void aligned_ttmem_free(void* mem);
+void aligned_ttmem_free(void* mem); // nop if mem == nullptr
 
 void dbg_hit_on(bool b);
 void dbg_hit_on(bool c, bool b);
@@ -110,6 +110,19 @@ public:
   { return T(rand64() & rand64() & rand64()); }
 };
 
+inline uint64_t mul_hi64(uint64_t a, uint64_t b) {
+#if defined(__GNUC__) && defined(IS_64BIT)
+    __extension__ typedef unsigned __int128 uint128;
+    return ((uint128)a * (uint128)b) >> 64;
+#else
+    uint64_t aL = (uint32_t)a, aH = a >> 32;
+    uint64_t bL = (uint32_t)b, bH = b >> 32;
+    uint64_t c1 = (aL * bL) >> 32;
+    uint64_t c2 = aH * bL + c1;
+    uint64_t c3 = aL * bH + (uint32_t)c2;
+    return aH * bH + (c2 >> 32) + (c3 >> 32);
+#endif
+}
 
 /// Under Windows it is not possible for a process to run on more than one
 /// logical processor group. This usually means to be limited to use max 64