STINNER Victor <vstin...@python.org> added the comment:

I'm not sure why people insists to say that it's 31 bit CPU, gcc-s390.txt shows 
that it uses a classic 32-bit ABI (32-bit long/size_t):

#define __SIZE_MAX__ 0xffffffffUL
#define __LONG_WIDTH__ 32

31-bit is a limit of the address space (memory), not the ALU.

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<https://bugs.python.org/issue43179>
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