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This is a good answer, but I'd appreciate details on why choose undefined behavior rather than unspecified behavior (i.e. the result will have some value, but no velociraptors are involved) .

sbabbi
– sbabbi

2015-03-19 08:43:01 +00:00
Commented Mar 19, 2015 at 8:43
@sbabbi: Making it undefined behavior means that a compiler can optimize int shift(int v, int n) { if (n >= 32) v=0; return v<<n;} by eliminating the first if(n>=32) v=0;, regardless of what the processor will do with the request, since if n is 32 or larger the C standard says the compiler can do whatever it wants.

supercat
– supercat

2015-04-17 23:45:58 +00:00
Commented Apr 17, 2015 at 23:45

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