[fpc-pascal] Currency and Int64 casting

[Vojtěch Čihák]

Hi,
 
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 andunit1.pas:36                              i:=Int64(c);000000000046EECD 4c8b2424                 mov    (%rsp),%r12unit1.pas:38                              writeln(i);at Level3.I just noticed that you wrote you are expecting 1000. You should expect 10000 since currency has four decimals.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> <lacak at zoznam.sk>
 > Komu: FPC-Pascal users discussions <fpc-pascal at lists.freepascal.org> <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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