Stefan Krah added the comment: > Given all the problems, I'll stop using PGO on all branches and > as the compiler apparently generates bad code.
That is probably the best solution. The problem in memoryview.c:pack_single() is that Visual Studio optimizes the memcpy() to mov instructions, but exchanges the low and high dwords: unsigned __int64 llu = 1; do { unsigned __int64 x; x = (unsigned __int64)llu; // At this point x=llu is in edx=1 and ecx=0. // The memcpy() is optimized to: // mov dword ptr [esi], ecx // mov dword ptr [esi+4], edx memcpy(ptr, (char *)&x, sizeof x); } while (0); ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue15993> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com