[ARM] Regression between r215896 and r215960

[Renato Golin]

Just found out that this is a bug in the clang/llvm compiled with that
particular version, as opposed to that clang/llvm version compiled
with an older clang. This will make finding the bug a lot harder... :(

We may have to revert whatever patch broke it before we can actually fix it.

cheers,
--renato

On 19 August 2014 22:12, Renato Golin <renato.golin at linaro.org> wrote:
> Hi Ismail,
>
> Our buildbot picked it up:
>
> http://lab.llvm.org:8011/builders/clang-native-arm-cortex-a15-self-host/builds/1985
>
> I'm bisecting right now.
>
> cheers,
> --renato
>
> On 19 August 2014 14:31, İsmail Dönmez <ismail at donmez.ws> wrote:
>> Hi,
>>
>> To reproduce, get http://www.cs.utah.edu/~aek/code/card.cpp and
>>
>> [~]> clang++ -O1 card.cpp -o card
>> clang-3.6: ../lib/Support/IntervalMap.cpp:138: IdxPair
>> llvm::IntervalMapImpl::distribute(unsigned int, unsigned int, unsigned int,
>> const unsigned int *, unsigned int *, unsigned int, bool): Assertion `Sum ==
>> Elements + Grow && "Bad distribution sum"' failed.
>> Stack dump:
>> 0.      Program arguments: /havana/dist/llvm/bin/clang-3.6 -cc1 -triple
>> armv7-unknown-linux-gnueabihf -emit-obj -disable-free -main-file-name
>> card.cpp -mrelocation-model static -mdisable-fp-elim -fmath-errno
>> -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu cortex-a8
>> -target-abi aapcs-linux -mfloat-abi hard -dwarf-column-info -resource-dir
>> /havana/dist/llvm/bin/../lib/clang/3.6.0 -internal-isystem
>> /usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../../include/c++/4.9
>> -internal-isystem
>> /usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../../include/c++/4.9/arm-linux-gnueabihf
>> -internal-isystem
>> /usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../../include/c++/4.9/backward
>> -internal-isystem
>> /usr/lib/gcc/arm-linux-gnueabihf/4.9/../../../../include/arm-linux-gnueabihf/c++/4.9
>> -internal-isystem /usr/local/include -internal-isystem
>> /havana/dist/llvm/bin/../lib/clang/3.6.0/include -internal-externc-isystem
>> /usr/include/arm-linux-gnueabihf -internal-externc-isystem /include
>> -internal-externc-isystem /usr/include -O1 -fdeprecated-macro
>> -fdebug-compilation-dir /home/ismail -ferror-limit 19 -fmessage-length 104
>> -mstackrealign -fno-signed-char -fobjc-runtime=gcc -fcxx-exceptions
>> -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o
>> /havana/tmp/card-13c953.o -x c++ card.cpp
>> 1.      <eof> parser at end of file
>> 2.      Code generation
>> 3.      Running pass 'Function Pass Manager' on module 'card.cpp'.
>> 4.      Running pass 'Greedy Register Allocator' on function
>> '@_Z1T1vS_RfRS_'
>> clang-3.6: error: unable to execute command: Aborted
>> clang-3.6: error: clang frontend command failed due to signal (use -v to see
>> invocation)
>> clang version 3.6.0 (215976)
>> Target: armv7l-unknown-linux-gnueabihf
>> Thread model: posix
>> clang-3.6: note: diagnostic msg: PLEASE submit a bug report to
>> http://llvm.org/bugs/ and include the crash backtrace, preprocessed source,
>> and associated run script.
>> clang-3.6: note: diagnostic msg:
>> ********************
>>
>> PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
>> Preprocessed source(s) and associated run script(s) are located at:
>> clang-3.6: note: diagnostic msg: /havana/tmp/card-e32b8e.cpp
>> clang-3.6: note: diagnostic msg: /havana/tmp/card-e32b8e.sh
>> clang-3.6: note: diagnostic msg:
>>
>> ********************
>>
>> This is on a native ARMv7 host (BeagleBone Black) and r215896 works fine.
>>
>>
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