• Luc Bourhis (8/8) Feb 12 2015 What is the difference between (i) core.math, (ii) std.math,
• Ilya Yaroshenko (15/23) Feb 12 2015 Hi!
• Luc Bourhis (1/1) Feb 14 2015 Thank you very much Ilya for this comprehensive and clear answer.

"Luc Bourhis" <ljbo nowhere.com> writes:

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?

"Ilya Yaroshenko" <ilyayaroshenko gmail.com> writes:

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?

"Luc Bourhis" <ljbo nowhere.com> writes:

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