[LLVMdev] Crash/Assert on -loop-reduce

[Eli Friedman]

Filed http://llvm.org/bugs/show_bug.cgi?id=11950 .

-Eli

On Wed, Feb 8, 2012 at 2:01 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:
> Ok, I have attached the bugpoint-reduced-blocks.ll test case, just fyi.
> Thanks, I'm just curious at this point.
>
>
> On Wed, Feb 8, 2012 at 11:56 AM, Eli Friedman <eli.friedman at gmail.com>
> wrote:
>>
>> On Wed, Feb 8, 2012 at 10:09 AM, Ryan Taylor <ryta1203 at gmail.com> wrote:
>> > Unfortunately, I cannot provide the exact code, but I will attempt to
>> > look
>> > for the reason and post a test case.
>>
>> Okay... note that bugpoint is very good at reducing testcases which crash.
>>
>> -Eli
>>
>> >
>> >
>> > On Tue, Feb 7, 2012 at 6:04 PM, Eli Friedman <eli.friedman at gmail.com>
>> > wrote:
>> >>
>> >> On Tue, Feb 7, 2012 at 5:52 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:
>> >> > opt:
>> >> >
>> >> > /home/ryan/llvm/llvm_core/llvm-3.0/include/llvm/Support/Casting.h:194:
>> >> > typename cast_retty<Instruction, User *>::ret_type
>> >> > llvm::cast(llvm::User
>> >> > *const &): Assertion `isa<X>(Val) && "cast<Ty>() argument of
>> >> > incompatible
>> >> > type!"' failed.
>> >> > 0  opt             0x000000000085cfef
>> >> > 1  opt             0x000000000085d509
>> >> > 2  libpthread.so.0 0x00007fdb30054c60
>> >> > 3  libc.so.6       0x00007fdb2f33fd05 gsignal + 53
>> >> > 4  libc.so.6       0x00007fdb2f343ab6 abort + 390
>> >> > 5  libc.so.6       0x00007fdb2f3387c5 __assert_fail + 245
>> >> > 6  opt             0x000000000051a9a6
>> >> > 7  opt             0x000000000051979e
>> >> > 8  opt             0x0000000000503863
>> >> > 9  opt             0x000000000050102e
>> >> > 10 opt             0x0000000000689184
>> >> > llvm::LPPassManager::runOnFunction(llvm::Function&) + 836
>> >> > 11 opt             0x0000000000801f9f
>> >> > llvm::FPPassManager::runOnFunction(llvm::Function&) + 351
>> >> > 12 opt             0x000000000080221b
>> >> > llvm::FPPassManager::runOnModule(llvm::Module&) + 59
>> >> > 13 opt             0x000000000080236a
>> >> > llvm::MPPassManager::runOnModule(llvm::Module&) + 282
>> >> > 14 opt             0x0000000000802941
>> >> > llvm::PassManagerImpl::run(llvm::Module&) + 337
>> >> > 15 opt             0x0000000000802e4a
>> >> > llvm::PassManager::run(llvm::Module&)
>> >> > + 10
>> >> > 16 opt             0x00000000004919d7 main + 5511
>> >> > 17 libc.so.6       0x00007fdb2f32aeff __libc_start_main + 255
>> >> > 18 opt             0x000000000048bc95
>> >> > Stack dump:
>> >> >
>> >> > If I don't use the opt -loop-reduce then this code runs fine. I'm not
>> >> > really
>> >> > sure the issue.
>> >>
>> >> It's hard to say what is happening without a testcase.
>> >>
>> >> -Eli
>> >
>> >
>
>