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);
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<http://bugs.python.org/issue15993>
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