Am I missing something? Is there some real benefit to using types
like int32_t instead of int in some places in our code and not
others? If so, what are these critical places and what makes them
different from the rest of the code?
In JavaScriptCore, some structures have integer members that must be
32bits in size, regardless of processor type. In those places, int32_t
and uint32_t are useful.
Less clear to me is whether clients of such structures should also use
int32_t / uint32_t. For example:
struct {
int32_t i;
} s;
int32_t i32 = s.i; // option 1
int i = s.i; // option 2
Technically, option 2, which converts from int32_t to int, requires a
"32bit move with sign extension to 64bit" instead of just a "32bit
move", but Intel's documentation says that 32bit to 64bit sign
extension is the very fastest instruction on the processor, so maybe
it doesn't matter.
Geoff
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