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I currently think the C compiler vendors have gone too far with this.

Although the specification says this behaviour is undefined in practice I used to map the undefined portion to being whatever my hardware did, not whatever the compiler felt like this week.

This ruins the C as a portable assembler use case and means if I was doing this sort of work I'd probably write these sort of routines in assembler rather than trying to fight with versions of C compiler.




...how was C "portable" assembler if its semantics depended on the underlying hardware? That's by definition unportable.




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