On Thu, 30 Nov 2006, Artur Krzysztof Szostak wrote:
I don't think there is any simple way to do this without using the -g
option.
Note that the -g option does not affect code generation in any way.
You can use -O3 with or without -g, and you will get the same code.
Will the -g -O3 option truly give me code that executed at the same speed
as -O3? I was not aware of that. In that case -g is fine. But even with -g I
am not getting the result I want. I guess it is time for a specific example:
Lets say I have the fillowing code in test.cxx
float func(float a, float b)
{
return a * b;
}
[..snip..]
Something like
<transcript>
cas$ g++ -c -g -O3 -Wa,-ahl=cas.s cas.c
cas$ sed -n /func/,40p cas.s
12 .globl _Z4funcff
13 .type _Z4funcff, @function
14 _Z4funcff:
15 .LFB3:
16 .file 1 "cas.c"
1:cas.c **** float func(float a, float b)
2:cas.c **** {
17 .loc 1 2 0
18 .LVL0:
19 0000 55 pushl %ebp
20 .LCFI0:
21 0001 89E5 movl %esp, %ebp
22 .LCFI1:
23 0003 D9450C flds 12(%ebp)
3:cas.c **** return a * b;
24 .loc 1 3 0
25 .LBB2:
26 0006 D84D08 fmuls 8(%ebp)
4:cas.c **** }
27 .loc 1 4 0
28 0009 5D popl %ebp
29 000a C3 ret
32 .size _Z4funcff, .-_Z4funcff
215 0012 66756E63 .string "func"
233 0006 66756E63 .string "func"
</transcript>
perhaps
--
vale
