[LLVMdev] Loop-Unroll optimization

[Manish Gupta]

You mean like

*llvm-gcc-4.2 -O2 -emit-llvm Hello.c -c -o Hello.bc*

But still i am not able to observe any effect on bit code by running

*opt-2.8 -loop-unroll Hello.bc -o Hello_unroll.bc*

On Tue, May 3, 2011 at 3:58 AM, Zakk <zakk0610 at gmail.com> wrote:

> Hi, you need to run some optimization passes first. (like -O2)
>
> 2011/5/3 Manish Gupta <mgupta.iitr at gmail.com>
>
>> I just want to try loop-unroll and see corresponding changes in the
>> bitcode file. For that any loop will do. Have you been able to test llvm
>> loop-unroll successfully?
>>
>>
>> On Mon, May 2, 2011 at 10:04 PM, Yuan Pengfei <coolypf at qq.com> wrote:
>>
>>> Hi,
>>>
>>> > The loop that I am trying it on is:
>>> > for(i=0; i< 1000; i++)
>>> > {
>>> > c[i] = a[i] + b[i];
>>> > }
>>>
>>> I can't find any benefit unrolling this loop.
>>>
>>> ------------------
>>> Yuan Pengfei
>>> Peking Unversity, China
>>
>>
>>
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>>
>>
>
>
> --
> Best regards,
> Kuan-Hsu
>
>
>
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