On Friday, 13 November 2015 at 19:59:51 UTC, Ali Çehreli wrote:
On 11/12/2015 11:50 AM, Ali Çehreli wrote:
I would love to be convinced. :) Can someone come up with a
reduced
example please?
On 11/12/2015 03:59 AM, Daniel Kozak wrote:
> for (i=0; i < 1000000; ++i) {
> fmttable(table);
> }
I think what we are seeing here is more due to the unused
side-effect in
the loop, where compiling with -w fails compilation:
Warning: calling deneme.fmttable without side effects discards
return
value of type string, prepend a cast(void) if intentional
Ali
Can someone please tell me if I am mistaken not.
Once again, I don't think this example is fast because the
compiler reuses the return value of fmttable() in the loop.
Rather, it simply removes the whole expression because its only
side-effect is not used in the program.
Perhaps that's what everybody else is saying anyway. :)
(Why don't I look at the assembly myself? Going to a meeting...
:p)
Ali
I confirm it, here is the loop part:
0x004375c2 31db xor ebx, ebx
┌─> 0x004375c4 ffc3 inc ebx
│ 0x004375c6 81fb40420f00 cmp ebx, 0xf4240
└─< 0x004375cc 72f6 jb 0x4375c4
0x004375ce 8bfb mov edi, ebx
0x004375d0 e8230d0000 call
sym._D3std5stdio14__T7writelnTiZ7writelnFNfiZv
(DMD 2.069 -O -release -inline -boundscheck=off, code from the
first post)
