Error in argument order when generating assembler code for indirect addressing
Summary
In the use of variables in assembler inserts, their order is not generated correctly.......
System Information
- Operating system: Windows
- Processor architecture: x86
- Compiler version: trunk
- Device:
Steps to reproduce
Below is an example of code that doesn't work and why it doesn't work...
Example Project
program project1; //x32
{$mode objfpc}{$H+}
uses {$IFDEF UNIX}
cthreads, {$ENDIF}
Classes { you can add units after this };
procedure Norm(Len: PtrUint; var P1, P2); assembler; nostackframe;
asm
MOVD XMM0, [P1+EAX*4]
MOVD [P2+EAX*4],XMM0
end;
procedure BAD(Len: PtrUint; var P1, P2); assembler; nostackframe;
asm
MOVD XMM0, [P1+LEN*4]
MOVD [P2+Len*4],XMM0
end;
type
AR = packed array [0..7] of byte;
var
Data1: AR = (1, 1, 1, 1, 1, 1, 1, 1);
Data2: AR = (2, 2, 2, 2, 2, 2, 2, 2);
i: byte;
begin
NORM(1, Data1, Data2);
for i := 0 to 7 do Write(Data2[i]);
BAD(1, Data1, Data2);
for i := 0 to 7 do Write(Data2[i]);
readln;
end.The FPC in the "BAD" procedure generates
"; [20] MOVD [P2+Len*4],XMM0
%LINE 20+0
movd [eax+ecx*4],xmm0
CPU p4"instead of correct
; [20] MOVD [P2+Len*4],XMM0
%LINE 20+0
movd [ecx+eax*4],xmm0
CPU p4