[LLVMdev] recreate optimized clang output

[Samuel Crow]

Hi Patrick,

You have to tell opt which optimizations you want it to do.  The 
-std-compile-opts option for opt may be what you're looking for.

--Sam


----- Original Message ----
> From: "Hendrix_ at gmx.net" <Hendrix_ at gmx.net>
> To: llvmdev at cs.uiuc.edu
> Sent: Mon, January 24, 2011 12:36:42 PM
> Subject: [LLVMdev] recreate optimized clang output
> 
> Hi,
> 
> I was using "clang  -O3 -S -emit-llvm" got some very optimized  output.
> 
> Then I did "clang -S -emit-llvm" (without optimization) and  wanted to 
>optimized the code in a
> separate pass. The llvm program "opt" did  not do anything.
> 
> How can I invoke the optimizer on some un-optimized  program, possibly showing 
>the output of each optimizer stage?
> I would like to  get a deeper understanding of the optimization  pass.
> 
> Best,
> Patrick
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