21 Jan
2009
21 Jan
'09
8:06 p.m.
Hi Eliot,
Eliot Miranda wrote:
Hi All, anyone know the x86/IA32 really well? If so, read on. Otherwise save yourself the yawn.
[...]
(my emphasis added). But neither the Bochs simulator nor my Intel Core Duo set the flags when doing sarl $1, %eax when %eax contains -1. Have I misread, or is the manual wrong?
I cannot confirm this. Using this simple C-Program:
int calc(int i) { return i >> 1; }
int main() { printf("%i\n", calc(-1)); }
my GCC 4.3.2 generates a sarl %eax instruction as the assembler output shows. Debugging it with Kdbg shows a change of the flags after the instruction. In fact, CF and SF are set as (more or less) expected. I also have a Intel Core 2 Duo.
Regards, Martin