On Thursday, 23 October 2014 at 21:42:46 UTC, anonymous wrote:
On Thursday, 23 October 2014 at 21:17:25 UTC, deed wrote:
Some testing can be found on http://dpaste.dzfl.pl/5f55f4152aa8
for both Windows and Linux. This just illustrates the sin
function.
I think the tests marked "[1]" are expected to fail. They
involve
converting one operand of the comparison to double, but not the
other. The comparison is done using real precision. So, one
operand goes through a real->double->real conversion, which
changes the value.
You're right about those marked [1]; sin returns real and
shouldn't be expected to equal the same value truncated to double
or float and then extended back to real.
Converting the sin to double and compare is expected to work for
those, and it does when compiled with -m64, but not with -m32, on
Linux:
--
import std.math : sin;
import std.conv : to;
double fun (double a) { return sin(a); }
immutable double a = 3.
assert (fun(a) == sin(a).to!double); // Works when compiled with
-m64
--
The behaviour of those only marked [2] and [4] (the 32-bit
versions) seems to be a bug.
