Hi All,
This is regarding the assembly level optimization .Is it possible to
find out from the object code to what level it is optimized .i.e. for
e.g. in gcc compiler we have several level of optimizations so if once
the compiler performs the optimization both architecture specific and
non-architecture specific.
Now after the assembler converts it into objcode than can it be
determined at that time to which level that code is optimized
Though according to me it's not possible but I need your suggestions
on that.
Thanks and Best Regards,
*
Jatin Bhateja
Subject Matter Expert
AMDCS INTEGRATED CUSTMER MANAGEMENT
[I would think that for a particular compiler and target system, you could
find patterns generated by each opt level, but in general it seems like a
hopeless waste of time. -John]

2005-10-26, Jatin Bhateja <jatin.bhateja@amdocs.comwrote:
Now after the assembler converts it into objcode than can it be
determined at that time to which level that code is optimized
Though according to me it's not possible but I need your suggestions
on that.

[I would think that for a particular compiler and target system, you could
find patterns generated by each opt level, but in general it seems like a
hopeless waste of time. -John]

If the binary mustn't be extremely tight, simply add the compiler
options used as a string in the binary.

If not, as John says, you can implement heuristics, but these are horribly
compiler, level, target and (even minor!) version dependant

Moreover, with compilers like gcc, the levels are only global, and more
finegrained control over optimization (on a per specific optimization basis)
is usually possible.