FPC 3.2.2 Assembly Problem when using -a and -A Options

[paule32]

Hi,
I have a strange Problem on compile a Source Code:
when I doing the following Command:

Code: Bash  [Select][+][-]

1. fpc -dDLLEXPORT -dLANGDEU -n -B -O3 -Os -CD -a -al -Anasmwin64 xmm.pas

I get message:

Code: Bash  [Select][+][-]

1. xmm.pas:148: error: mismatch in operand sizes
2. xmm.pas(144,1) Error: Error while assembling exitcode 1
3. xmm.pas(144,1) Fatal: There were 2 errors compiling module, stopping
4. Fatal: Compilation aborted
5. Error: C:\fpcupdeluxe\fpc\bin\x86_64-win64\ppcx64.exe returned an error exitcode

when I compile with:

Code: Bash  [Select][+][-]

1. fpc -dDLLEXPORT -dLANGDEU -n -B -O3 -Os -CD -a -al -Anasmwin64 -Xe -sh xmm.pas

I get message:

Code: Bash  [Select][+][-]

1. xmm.pas(12,1) Error: Duplicate identifier "SYSTEM"
2. xmm.pas(12,1) Error: Compilation raised exception internally
3. Fatal: Compilation aborted
4. An unhandled exception occurred at $00000001000615EC:
5. EAccessViolation: Access violation
6.   $00000001000615EC
7.   $0000000100045FFA
8.   $00000001000461DB
9.   $000000010019D378
10.   $000000010003DCE5
11.   $0000000100017941
12.   $0000000100001A3D
13.   $0000000100001A56
14.   $0000000100014280
15.   $0000000100001850
16.   $00007FF815EF257D
17.   $00007FF8163EAF08
18.  
19. Error: C:\fpcupdeluxe\fpc\bin\x86_64-win64\ppcx64.exe returned an error exitcode

Before Line 12 (11): {$mode ObjFPC}{$H+}
          Line       12 : is empty
After   Line 12 (13): interface

When I compile without -a and -A Options, FPC does not stuck into troubles, and produce a executable.

[paule32]

okay. I found a solution by my self:
I had the following Code:

Code: ASM  [Select][+][-]

1. lock xchg [target], eax
2.  
3. // instead of:
4. xchg dword ptr [target], eax

The "lock" is not needed by modern CPU's, because they do this self.

[Khrys]

The "lock" is not needed by modern CPU's, because they do this self.

True, but only for the  xchg  instruction:

If a memory operand is referenced, the processor’s locking protocol is automatically implemented for the duration of the exchange operation, regardless of the presence or absence of the LOCK prefix or of the value of the IOPL.

Note that the change you made (adding a size specifier) can still be combined with the  lock  prefix; the following compiles/assembles just fine:

Code: ASM  [Select][+][-]

1. lock xchg dword ptr [target], eax