[fpc-pascal] Currency and Int64 casting

[LacaK]

Than you,

>
> I have
>
> unit1.pas:36                     i:=Int64(c);
>
> 000000000046EEE0 488b45e8                 mov    -0x18(%rbp),%rax
>
> 000000000046EEE4 488945e0                 mov    %rax,-0x20(%rbp)
>
> unit1.pas:38                     writeln(i);
>
> at Level0 and
> unit1.pas:36                              i:=Int64(c);
> 000000000046EECD 4c8b2424                 mov (%rsp),%r12
> unit1.pas:38                              writeln(i);
> at Level3.
So we can clearly say, that x64_86 output is different on Linux and 
Windows64
It is at least strange from my POV because I would expect consistent 
results across platforms.

> I just noticed that you wrote you are expecting 1000. You should 
> expect 10000 since currency has four decimals.
Yes, it was typo. Of course I expect 10000

L.

> V.
>
> ______________________________________________________________
> > Od: LacaK <lacak at zoznam.sk>
> > Komu: fpc-pascal at lists.freepascal.org
> > Datum: 18.05.2018 07:54
> > Předmět: Re: [fpc-pascal] Currency and Int64 casting
> >
>
>
>     Linux 64-bit Lazarus 1.9.0 r57948M FPC 3.1.1 x86_64-linux-qt gives
>
>      1.000000000000000000E+00 10000
>
> What is dissassembly for:
>   i:=Int64(c);?
>
> I have for Win32:
> test_curr_int64.lpr:19            i1 := Int64(c);
> 0040158D a100c04200               mov    0x42c000,%eax
> 00401592 a310c04200               mov    %eax,0x42c010
> 00401597 a104c04200               mov    0x42c004,%eax
> 0040159C a314c04200               mov    %eax,0x42c014
>
> and for Win64:
> test_curr_int64.lpr:19                    i1 := Int64(c);
> 00000001000015BD 488b0d3caa0300           mov 
> 0x3aa3c(%rip),%rcx        # 0x10003c000
> 00000001000015C4 48b84b598638d6c56d34     movabs $0x346dc5d63886594b,%rax
> 00000001000015CE 48f7e9                   imul   %rcx
> 00000001000015D1 48c1fa0b                 sar    $0xb,%rdx
> 00000001000015D5 48c1e93f                 shr    $0x3f,%rcx
> 00000001000015D9 4801ca                   add    %rcx,%rdx
> 00000001000015DC 4889152daa0300           mov 
> %rdx,0x3aa2d(%rip)        # 0x10003c010
>
>
> L.
>
>     ______________________________________________________________
>     > Od: LacaK <lacak at zoznam.sk> <mailto:lacak at zoznam.sk>
>     > Komu: FPC-Pascal users discussions
>     <fpc-pascal at lists.freepascal.org>
>     <mailto:fpc-pascal at lists.freepascal.org>
>     > Datum: 17.05.2018 13:33
>     > Předmět: [fpc-pascal] Currency and Int64 casting
>     >
>
>     Hi,
>
>     consider following program:
>
>     var
>       c: currency;
>
>     begin
>       c := 1;
>       writeln(c,' ',Int64(c));
>       readln;
>     end.
>
>     FPC 3.0.4
>     On Win32/x86 I get: 1, 1000  (what I am expecting)
>     On Win64/x86_64 I get: 1, 1
>
>     Is is as expected ?
>
>     Is there safe way for both platforms how to get 1000 (beside that
>     I can
>     use: i: int64 absolute c;)
>
>     Thanks
>
>     -Laco.
>
>     _______________________________________________
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>
>
>     _______________________________________________
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>
>
>
>
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>
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>
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