> 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;
}
and try to generate the assembly with
g++ -g -O3 -Wa,-addhls test.cxx -S
I would get the following (This output is truncated, I left out all the debug
symbols at the end):
# ... bla bla bla...
.LFB2:
.file 1 "test.cxx"
.loc 1 3 0
.LVL0:
pushl %ebp
.LCFI0:
movl %esp, %ebp
.LCFI1:
.loc 1 3 0
flds 12(%ebp)
.LBB2:
.loc 1 4 0
fmuls 8(%ebp)
.LBE2:
.loc 1 5 0
leave
ret
.LFE2:
.size _Z4funcff, .-_Z4funcff
# ... etc ...
And I dont see any comments containing my c++ source lines. I would have
expected something like:
# ... bla bla bla...
.LFB2:
.file 1 "test.cxx"
.loc 1 3 0
# float func(float a, float b)
# {
.LVL0:
pushl %ebp
# return a * b;
.LCFI0:
movl %esp, %ebp
.LCFI1:
.loc 1 3 0
flds 12(%ebp)
.LBB2:
.loc 1 4 0
fmuls 8(%ebp)
.LBE2:
.loc 1 5 0
leave
ret
# }
.LFE2:
.size _Z4funcff, .-_Z4funcff
# ... etc ...
Any ideas how to get his kind of output?
--
Artur Szostak
Tel. +27 21 650 3356
Mobile: +27 82 297 9502
Emails: artur@xxxxxxxxxxxxxxxxxxx artursz@xxxxxxxxxxx
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Room: 4T6
Address:
R.W. James Building,
Rondebosch, 7701
Cape Town, South Africa
Physics Department
University of Cape Town
