• SteveGuo (6/6) Aug 06 2013 D supports inline functions, But I want to know the details.
• Peter Alexander (6/6) Aug 06 2013 1. You have to add -inline
• SteveGuo (3/9) Aug 06 2013 Thanks for replying:)
• SteveGuo (1/3) Aug 06 2013 Or maybe I should ask are there levels for the switch -inline?
• Iain Buclaw (6/18) Aug 06 2013 I wonder what other compiler you are referring to that has a
• David (6/13) Aug 06 2013 My experience with -inline.
• SteveGuo (1/7) Aug 06 2013 Thanks for replying:) I will try LDC or GDC.
• bearophile (7/10) Aug 06 2013 Recently the dmd inlining situation has improved, now the small
• qznc (10/14) Aug 06 2013 As far as I know, no compiler specifies anything for this.

"SteveGuo" <steveguo outlook.com> writes:

D supports inline functions, But I want to know the details.

1. Is inline the default behavior? Or I have to add a compiler 
switch -inline?
2. The depth of inline.
3. If I add the switch -inline when compiling, it will inline 
everything no matter how complex the function is?

"Peter Alexander" <peter.alexander.au gmail.com> writes:

1. You have to add -inline

2. Don't know. I'm guessing it depends on the function 
complexity, among other things.

3. No, it cannot possibly inline everything due to recursive 
functions, and indirect function calls. It would also be a 
terrible idea due to code bloat.

"SteveGuo" <steveguo outlook.com> writes:

On Tuesday, 6 August 2013 at 11:07:54 UTC, Peter Alexander wrote:
 1. You have to add -inline

 2. Don't know. I'm guessing it depends on the function 
 complexity, among other things.

 3. No, it cannot possibly inline everything due to recursive 
 functions, and indirect function calls. It would also be a 
 terrible idea due to code bloat.

Thanks for replying:)
Ok, then is there a -forceinline option like other compiler?

"SteveGuo" <steveguo outlook.com> writes:

 Thanks for replying:)
 Ok, then is there a -forceinline option like other compiler?

Or maybe I should ask are there levels for the switch -inline?

Iain Buclaw <ibuclaw ubuntu.com> writes:

On 6 August 2013 12:18, SteveGuo <steveguo outlook.com> wrote:
 On Tuesday, 6 August 2013 at 11:07:54 UTC, Peter Alexander wrote:
 1. You have to add -inline

 2. Don't know. I'm guessing it depends on the function complexity, among
 other things.

 3. No, it cannot possibly inline everything due to recursive functions,
 and indirect function calls. It would also be a terrible idea due to code
 bloat.


 Thanks for replying:)
 Ok, then is there a -forceinline option like other compiler?

I wonder what other compiler you are referring to that has a
-forceinline switch... seems odd to have one.


-- 
Iain Buclaw

*(p < e ? p++ : p) = (c & 0x0f) + '0';

David <d dav1d.de> writes:

Am 06.08.2013 13:01, schrieb SteveGuo:
 D supports inline functions, But I want to know the details.
 
 1. Is inline the default behavior? Or I have to add a compiler switch
 -inline?
 2. The depth of inline.
 3. If I add the switch -inline when compiling, it will inline everything
 no matter how complex the function is?

My experience with -inline.
Without: runs fine
With: segfaults

Handle DMD with care, if you want performance, use LDC or GDC, both do a
better job without introducing segfaults

"SteveGuo" <steveguo outlook.com> writes:

 My experience with -inline.
 Without: runs fine
 With: segfaults

 Handle DMD with care, if you want performance, use LDC or GDC, 
 both do a
 better job without introducing segfaults


Thanks for replying:) I will try LDC or GDC.

"bearophile" <bearophileHUGS lycos.com> writes:

David:

 My experience with -inline.
 Without: runs fine
 With: segfaults

Recently the dmd inlining situation has improved, now the small 
lambdas often used with std.algorithms are inlined correctly, 
they have even removed one workaround in the all() function. I 
think the dmd patch was from Kenji.

Bye,
bearophile

"qznc" <qznc web.de> writes:

On Tuesday, 6 August 2013 at 11:01:35 UTC, SteveGuo wrote:
 D supports inline functions, But I want to know the details.

 2. The depth of inline.
 3. If I add the switch -inline when compiling, it will inline 
 everything no matter how complex the function is?

As far as I know, no compiler specifies anything for this. 
Inlining is a difficult optimization, because it is hard to 
quantify if a specific call is worth inlining. Usually, there are 
handwavy heuristics and various magic numbers. Nobody should 
depend on exact behavior here. For specific cases, you can always 
inspect the assembly.

Inlining everything is not possible in general. Consider 
recursive functions aka circles in the call graph. Dynamic 
binding and function pointers lead to calls of unknown functions.