[llvm-dev] Regarding Usage of opt

[Mehdi Amini via llvm-dev]

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 <mailto: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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