llvm dev - Apr 2010 - [LLVMdev] Specifying a sequence of optimization flags on llvm-gcc

On Mon, Apr 12, 2010 at 12:39 AM, Duncan Sands <baldrick at free.fr>
wrote:
>
> try something like this:
>
> llvm-gcc -c -emit-llvm -o - | opt ...list.transforms.here... > result.bc
>
Another question about it: is this transforms list applied in the same order
it's given to the command line? Can I repeat a transformation pass within a
list?

Thanks you!

Felipe
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On Tue, Apr 13, 2010 at 10:09 AM, Felipe Sodré Silva <fsodre at gmail.com>
wrote:
> On Mon, Apr 12, 2010 at 12:39 AM, Duncan Sands <baldrick at free.fr>
wrote:
>>
>> try something like this:
>>
>> llvm-gcc -c -emit-llvm -o - | opt ...list.transforms.here... >
result.bc
>
> Another question about it: is this transforms list applied in the same
order
> it's given to the command line?
hmm.. yes. Use -debug-pass=... on the opt command line to see what is
being executed. 'opt --help-hidden' lists -debug-pass and other hidden
command line options.
> Can I repeat a transformation pass within a
> list?
Yes!

-
Devang

On Tue, Apr 13, 2010 at 10:48 AM, Devang Patel <devang.patel at
gmail.com>wrote:
> hmm.. yes. Use -debug-pass=... on the opt command line to see what is
> being executed. 'opt --help-hidden' lists -debug-pass and other
hidden
> command line options.
>
> > Can I repeat a transformation pass within a
> > list?
>
> Yes!
>
> -
> Devang
>
Great. Thanks everyone!
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Hi Felipe,
> Another question about it: is this transforms list applied in the same
> order it's given to the command line? Can I repeat a transformation
pass
> within a list?
"opt -O2" gives you almost the same as "llvm-gcc -O2" etc.

Ciao,

Duncan.