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Re:The Itanium processor, part 1: Warming up by peterfirefly on Monday July 27, 2015 @02:34PM (#9957090)
You might have had less visible problems on other architectures as well.

setjmp()/longjmp() are not guaranteed to work with local variables not marked volatile.

Re:The Itanium processor, part 1: Warming up by peterfirefly on Monday July 27, 2015 @02:42PM (#9957151)
dmr explaining what's going on:

http://yarchive.net/comp/longjmp.html