On Thu, 12 May 2011 20:54:16 +0200 cobines wrote
> I have written the following program:
> ...
> max := 1;
> for i := 0 to max do
> vd := i / max;
A really smart compiler would notice that this in this loop the value of
vd is never examined, the loop being equivalent to
On Fri, May 13, 2011 at 11:23 AM, Jonas Maebe wrote:
>
> On 13 May 2011, at 16:08, Marcos Douglas wrote:
>
>> So, not to use the option -O in i386?
>> When I compile FPC sources, on Win32 XP SP3, using make, the option is
>> used.
>
> It is used because in general it results in faster code. This i
2011/5/13 Vincent Snijders :
> Did you try one of the -Cf options to enable MMX on i386?
I was wrong, sorry. The instruction in question is "cvtsi2sd", which
is SSE2 not MMX. Maybe on x86_64 SSE2 is default.
Indeed if I add -CfSSE2 than those instructions are generated for
i386, at least for vari
On Fri, May 13, 2011 at 11:12 AM, Vincent Snijders
wrote:
> 2011/5/13 Marcos Douglas :
>> So, not to use the option -O in i386?
>> When I compile FPC sources, on Win32 XP SP3, using make, the option is used.
>>
>> I'm confusing now...
>
> Did you try one of the -Cf options to enable MMX on i386?
On 13 May 2011, at 16:08, Marcos Douglas wrote:
So, not to use the option -O in i386?
When I compile FPC sources, on Win32 XP SP3, using make, the option
is used.
It is used because in general it results in faster code. This is one
particular example where it doesn't. That does not mean t
2011/5/13 Marcos Douglas :
> So, not to use the option -O in i386?
> When I compile FPC sources, on Win32 XP SP3, using make, the option is used.
>
> I'm confusing now...
Did you try one of the -Cf options to enable MMX on i386?
Vincent
___
fpc-pascal m
On Fri, May 13, 2011 at 9:54 AM, cobines wrote:
> 2011/5/13 Ben :
>> On 12/05/2011 20:54, cobines wrote:
>>>
>>> I'm running it on Windows XP i386, compiled with FPC 2.5.1 17430.
>>>
>>
>>
>> I tried this on my system which runs 64-bit Linux with FPC 2.4.3 (64-bit).
>>
>> Using -O, -O2 or -O3 comm
2011/5/13 Ben :
> On 12/05/2011 20:54, cobines wrote:
>>
>> I'm running it on Windows XP i386, compiled with FPC 2.5.1 17430.
>>
>
>
> I tried this on my system which runs 64-bit Linux with FPC 2.4.3 (64-bit).
>
> Using -O, -O2 or -O3 command line parameters. In each case, the
> generated executabl
On 12/05/2011 20:54, cobines wrote:
>
> I'm running it on Windows XP i386, compiled with FPC 2.5.1 17430.
>
I tried this on my system which runs 64-bit Linux with FPC 2.4.3 (64-bit).
Using -O, -O2 or -O3 command line parameters. In each case, the
generated executable runs exactly the same. The
