llvm dev - Feb 2015 - [LLVMdev] -stats prints nothing, though something is expected

Given the program:

int sum(int i,int j)
{ return i+j; }

int main()
{ sum(3,2); }

$ clang -S -emit-llvm foo.c

Now I'd like to print all statistics. Unfortunately, the following prints
nothing:

$ opt -S -O3 -stats < foo.ll > /dev/null

However, running the following prints an IR that is different to the
contents of foo.ll:

$ opt -S -O3 foo.ll

I'm using LLVM 3.5. I'm doing something very obviously wrong. What is
it?

--
Rob
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You are mostly likely using a Release build.  -stats only does anything 
with Assertions enabled.

On 02/18/2015 08:58 AM, Rob Stewart wrote:
> Given the program:
>
> int sum(int i,int j)
> { return i+j; }
>
> int main()
> { sum(3,2); }
>
> $ clang -S -emit-llvm foo.c
>
> Now I'd like to print all statistics. Unfortunately, the following 
> prints nothing:
>
> $ opt -S -O3 -stats < foo.ll > /dev/null
>
> However, running the following prints an IR that is different to the 
> contents of foo.ll:
>
> $ opt -S -O3 foo.ll
>
> I'm using LLVM 3.5. I'm doing something very obviously wrong. What
is it?
>
> --
> Rob
>
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Hi Philip,

On Wed Feb 18 2015 at 10:11:32 PM Philip Reames <listmail at
philipreames.com>
wrote:
>  You are mostly likely using a Release build.  -stats only does anything
> with Assertions enabled.
>
So to use the -stats flag, I must compile LLVM and clang from source, with
--enable-assertions ? That seems quite drastic just to see the printout of
statistics for each pass applied on my IR.

--
Rob

>
> On 02/18/2015 08:58 AM, Rob Stewart wrote:
>
> Given the program:
>
>  int sum(int i,int j)
> { return i+j; }
>
>  int main()
> { sum(3,2); }
>
>  $ clang -S -emit-llvm foo.c
>
>  Now I'd like to print all statistics. Unfortunately, the following
> prints nothing:
>
>  $ opt -S -O3 -stats < foo.ll > /dev/null
>
>  However, running the following prints an IR that is different to the
> contents of foo.ll:
>
>  $ opt -S -O3 foo.ll
>
>  I'm using LLVM 3.5. I'm doing something very obviously wrong. What
is it?
>
>  --
> Rob
>
>
> _______________________________________________
> LLVM Developers mailing listLLVMdev at cs.uiuc.edu        
http://llvm.cs.uiuc.eduhttp://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
>
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