[llvm-dev] Regarding Usage of opt

[Chengnian Sun via llvm-dev]

Mehdi.

Thank you so much for the pointer.

On Mon, Mar 7, 2016 at 12:48 AM, Mehdi Amini <mehdi.amini at apple.com> wrote:

> Hi,
>
>
>
> On Mar 7, 2016, at 12:40 AM, Chengnian Sun via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hi All,
>
> I run into another problem with "opt-trunk -loop-data-prefetch". The pass
> is in Transforms/Scalar/LoopDataPrefetch.cpp. How to avoid the following
> assertion failure, or I should just avoiding using this pass in isolation?
>
>
> Thank you.
>
> =============================================================
>
> $: opt-trunk -loop-data-prefetch t.c_000.bc -o temp.bc
> opt-trunk:
> /tmp/llvm-builder/llvm-source-trunk/lib/Transforms/Scalar/LoopDataPrefetch.cpp:102:
> virtual bool {anonymous}::LoopDataPrefetch::runOnFunction(llvm::Function&):
> Assertion `TTI->getCacheLineSize() && "Cache line size is not set for
> target"' failed.
>
>
> This assertions is telling you that the TTI seems not well initialized.
>
> Also, usually the test suite is a good source of example to see how to run
> passes:
>
> $ grep loop-data-prefetch  test/ -R
> test//Transforms/LoopDataPrefetch/PowerPC/basic.ll:; RUN: opt -mcpu=a2
> -loop-data-prefetch -S < %s | FileCheck %s
>
> Here notice how the cpu is defined on the command line.
>
> --
> Mehdi
>
>
>
>
> 0  opt-trunk       0x00000000018249b5
> llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
> 1  opt-trunk       0x0000000001822946 llvm::sys::RunSignalHandlers() + 54
> 2  opt-trunk       0x0000000001822b64
> 3  libpthread.so.0 0x00007f6b3f3e1340
> 4  libc.so.6       0x00007f6b3e5ffcc9 gsignal + 57
> 5  libc.so.6       0x00007f6b3e6030d8 abort + 328
> 6  libc.so.6       0x00007f6b3e5f8b86
> 7  libc.so.6       0x00007f6b3e5f8c32
> 8  opt-trunk       0x00000000016d9e1c
> 9  opt-trunk       0x00000000014877e3
> llvm::FPPassManager::runOnFunction(llvm::Function&) + 643
> 10 opt-trunk       0x0000000001487e2b
> llvm::legacy::PassManagerImpl::run(llvm::Module&) + 619
> 11 opt-trunk       0x00000000006f9ce9 main + 7353
> 12 libc.so.6       0x00007f6b3e5eaec5 __libc_start_main + 245
> 13 opt-trunk       0x0000000000738368
> Stack dump:
> 0.      Program arguments: opt-trunk -loop-data-prefetch t.c_000.bc -o
> temp.bc
> 1.      Running pass 'Function Pass Manager' on module 't.c_000.bc'.
> 2.      Running pass 'Loop Data Prefetch' on function '@main'
> Aborted (core dumped)
> $:
>
>
> On Fri, Mar 4, 2016 at 12:44 AM, Chengnian Sun <chengniansun at gmail.com>
> wrote:
>
>> Hi,
>>
>> I am new to llvm, and recently am playing with opt. I want to use opt to
>> apply one optimization pass to a .bc file. However, I encounter some
>> problems which I failed to find the answers on the internet. Any
>> suggestions are highly appreciated.
>>
>> Question 1:
>>
>> For example, I issued the following command
>>
>>     $: opt-trunk -si-lower-control-flow t.c_00.bc -o t.c_01.bc
>>
>> Then I got the following error,
>>
>> -------------------------------------------------------------- Error
>> Start --------------------------------------------------------------
>>
>> Pass 'SI Lower control flow pseudo instructions' is not initialized.
>>
>> Verify if there is a pass dependency cycle.
>>
>> Required Passes:
>>
>> opt-trunk:
>> /tmp/llvm-builder/llvm-source-trunk/lib/IR/LegacyPassManager.cpp:668: void
>> llvm::PMTopLevelManager::schedulePass(llvm::Pass*): Assertion `PI &&
>> "Expected required passes to be initialized"' failed.
>>
>>
>> -------------------------------------------------------------- Error End
>> --------------------------------------------------------------
>>
>> Question 2:
>>
>> Some passes depend on other dependencies. Is there any convenient way to
>> get the dependency for a specific pass?
>>
>> Thank you and best regards,
>>
>> Chengnian.
>>
>
>
>
> --
> Best Regards.
>
> Chengnian SUN.
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>
>


-- 
Best Regards.

Chengnian SUN.
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