On 18.12.2015 05:58, Nicholas Wilson wrote:
On Thursday, 17 December 2015 at 13:30:11 UTC, drug wrote:
On 17.12.2015 16:09, Nicholas Wilson wrote:
[...]
Thanks for answer. My C++ version is tracing D version so
commutativity and distributivity aren't requred because order of
operations is the same (I guess so at least), so I hoped for bit to
bit equality (it simplifies comparing serialized data). But I found
that error between D and C++ versions grows if more data processed so
I should investigate it anyway.
What I mean about order of operations is that if you go
a = b*a+c*c + e;
the compiler is free to rewrite that as
float __tmp0 = a*b;
float __tmp1 = c*c;
and then do either of
float __tmp2 = __tmp0+__tmp1;
a = __tmp2 + e;
OR
float __tmp2 = __tmp0+e;
a = __tmp2+__tmp1;
I see, thanks to all!
