[fpc-devel] Strange assembler from 2.7.1
lazarus at mfriebe.de
Thu Sep 6 23:00:47 CEST 2012
To start with, I have very sittle info, so this may not lead anywhere.
But then again, I was unable to reproduce it myself. So I would
appreciate any hint what I may be looking for...
I discovered this while debugging a PascalScript issue.
- A macbook. 64 bit intel (Owned by Mattias)
- FPC 2.7.1 - 32 bit - exact revision unknown - supposedly build without
any extra arguments to make
In unit classes is the following procedure
function Point(AX, AY: Integer): TPoint;
with Result do
X := AX;
Y := AY;
Being called from PascalScript it did not work.
A copy taken to a new unit and compiled with the very same fpc, and it did.
Stopping in the disassemble view (using asm single stepping) the point
in classes had the below asm:
0010BAF0 83ec0c sub $0xc,%esp
0010BAF3 890424 mov %eax,(%esp)
0010BAF6 89542404 mov %edx,0x4(%esp)
0010BAFA 8b0424 mov (%esp),%eax
0010BAFD 8b542404 mov 0x4(%esp),%edx
0010BB01 83c40c add $0xc,%esp
0010BB04 c3 ret
I don't have the exact copy of the asm for the case where the function
was compiled in a unit outside the RTL, but it used eax,ecx,edx. And eax
would be the pointer to the record (result:TPoint). Above the result is
For now, my question is: What settings could get fpc to generate the
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