Moreover:
var
c: currency;
i1: int64;
i2: int64 absolute c;
begin
c := 68719476736;
i1 := Trunc(c*10000);
writeln(c,', ',i1,', ',i2);
readln;
end.
Win32 (as expected): 6.871947673600000000E+10, 687194767360000,
687194767360000
Win64 (wrong) : 6.871947673600000000E+10, 53550614319
, 687194767360000
L.
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 <la...@zoznam.sk>
> Komu: fpc-pascal@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 <la...@zoznam.sk> <mailto:la...@zoznam.sk>
> Komu: FPC-Pascal users discussions
<fpc-pascal@lists.freepascal.org>
<mailto:fpc-pascal@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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