Some time ago, Iain Buclaw kindly added non-asm implementations of math
functions in std.math. However, CTFE still seems unable to correctly
evaluate certain functions like atan2:
import std.math;
enum x = atan2(1.0, 2.0);
Compiler output:
/usr/src/d/phobos/std/math.d(856): Error: asm statements cannot be
interpreted at compile time
/usr/src/d/phobos/std/math.d(917): called from here:
atan2(cast(real)y, cast(real)x)
test.d(2): called from here: atan2(1.00000, 2.00000)
Looking at std/math.d, it appears that version=InlineAsm_X86_Any is
defined, which leads to the asm implementation of atan2, which CTFE
can't interpret.
However, right below that block is an else block containing a D
implementation of atan2 that AFAICT *can* be interpreted in CTFE.
So it would appear that version=InlineAsm_X86_Any should be suppressed
during CTFE? But I'm not sure how this could be done in the compiler.
In any case, it's an annoying limitation. :-(
T
--
Never step over a puddle, always step around it. Chances are that whatever made
it is still dripping.
