homepage

> 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);