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

Hello all,

I'm very new to llvm, and I'm trying to compile a C file using llvm-gcc,
but
I'd like to specify the optimization passes sequence by myself. How can I do
this?

Thanks!

Felipe
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Hi Felipe,

Felipe Sodré Silva <fsodre at gmail.com> wrote:
> Hello all,
> 
> I'm very new to llvm, and I'm trying to compile a C file using
llvm-gcc, but
> I'd like to specify the optimization passes sequence by myself. How can
I do
> this?
I guess this may be what you're looking for:

  http://llvm.org/cmds/opt.html
> Thanks!
> 
> Felipe

Hi Felipe,
> I'm very new to llvm, and I'm trying to compile a C file using
llvm-gcc,
> but I'd like to specify the optimization passes sequence by myself. How
> can I do this?
try something like this:

llvm-gcc -c -emit-llvm -o - | opt ...list.transforms.here... > result.bc

This results in optimized bitcode in result.bc.

Ciao,

Duncan.

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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