eryksun added the comment:
With Visual Studio 2010 and earlier, SSE support had to be explicitly enabled.
Starting with VS2012 it's on by default [1]:
Because the x86 compiler generates code that uses SSE2
instructions by default, you must specify /arch:IA32 to
disable generation of SSE and SSE2 instructions for x86
processors.
For 3.5, the 32-bit build does use SSE2 instructions. For example, float_add
uses the addsd instruction (opcode F2 0F 58):
0:000> s python35!float_add l100 f2 0f 58
71f6c5d8 f2 0f 58 44 24 08 8b 0d-84 11 18 72 f2 0f 11 44 ..XD$......r...D
0:000> u 71f6c5d8 l3
python35!float_add+0x98:
71f6c5d8 f20f58442408 addsd xmm0,mmword ptr [esp+8]
71f6c5de 8b0d84111872 mov ecx,dword ptr [python35!free_list
(72181184)]
71f6c5e4 f20f11442410 movsd mmword ptr [esp+10h],xmm0
Thus 3.5 doesn't support older CPUs that lack SSE2, such as the AMD Athlon XP.
I didn't check the installer itself, but that would be a pointless exercise.
[1]: https://msdn.microsoft.com/en-us/library/7t5yh4fd
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nosy: +eryksun
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