[issue10044] small int optimization
Antoine Pitrou
report at bugs.python.org
Thu Oct 7 23:38:46 CEST 2010
Antoine Pitrou <pitrou at free.fr> added the comment:
> See the example above: suppose that a compiler is looking at a (p >=
> q) comparison of pointers. Suppose furthermore that in a particular
> case that compiler is smart enough to figure out that q is a pointer
> to the start of an array.
Which array? You can have arrays everywhere in memory, at any address,
ending anywhere.
union {
struct {
char ch1;
char arr1[2];
}
struct {
char arr2[2];
char ch2;
}
struct {
char arr3[3];
}
}
Which is an array, and which is not? is &ch1 an array? and arr1? and
arr2+1? Why would the compiler choose one over another? And what about
arrays defined in other modules?
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