assembler optimized integer overflow detection

Felix von Delius Delius at ebox.de
Mon Aug 23 11:28:06 CEST 1999


Hi there,

I wondered how Python detects integer overflows and searched the
corresponding code snippets in Python's source (Objects/intobject.c).
Because ANSI-C can't detect int overflow errors, there are very strange
workarounds for all the basic arithmetic.

I asked myself if it will be a big performance boost when someone will
re-code this routines in assembler, because an overflow can be detected very
simply by checking a processor-flag after performing the operation. Has
someone done this already? What speedup-factor would an optimization of this
kind have to the average Python code? Is it worth the work? (Let's say for
Linux/i386 machines). I'm not an Intel-assembly guy (only M68K experience),
but I think this wouldn't be too much efford for an Intel hacker, is it?

Felix
---
Dipl.-Ing. Felix von Delius		Fon: 0911/4244-110
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