What is the difference between (i) core.math, (ii) std.math, (iii) core.stdc.math and (iv) core.stdc.tgmath? (iv) falls back on (iii) as far as I can tell. (i) and (ii) seem to emit the same old x87 instructions, like fsin e.g., even for double and float. What's the difference?

So that leaves only core.stdc.math which may use fast SSE2 scalar instructions. It looks like it may do so, from a glance at the assembly with GDB. Could somebody shine some light?

Hi!

1. core.stdc.math - C math (sin(double), sinf(float),
sinl(real)). This functions are linked to libm.

2. core.stdc.tgmath - C math overloads (single name for
float/double/real). See also
http://www.cplusplus.com/reference/ctgmath/ . This functions are
link to libm.

3. core.math - Builtin mathematical intrinsics. They can be
executed at compile time.

4. std.math - Standart math module. Some functions can be
executed at compile time. Many functions defined only for `real`.
Work for `double` and `float` in progress.

Best Regards,
Ilya

On Thursday, 12 February 2015 at 20:56:34 UTC, Luc Bourhis wrote:
> What is the difference between (i) core.math, (ii) std.math, (iii) core.stdc.math and (iv) core.stdc.tgmath? (iv) falls back on (iii) as far as I can tell. (i) and (ii) seem to emit the same old x87 instructions, like fsin e.g., even for double and float. What's the difference?
>
> So that leaves only core.stdc.math which may use fast SSE2 scalar instructions. It looks like it may do so, from a glance at the assembly with GDB. Could somebody shine some light?

Thank you very much Ilya for this comprehensive and clear answer.