Regressions in ARM LNT buildbot due to SCEV changes

[Quuxplusone]

Bugzilla Link	PR18851
Status	RESOLVED FIXED
Importance	P normal
Reported by	Renato Golin (rengolin@gmail.com)
Reported on	2014-02-15 12:27:46 -0800
Last modified on	2014-02-16 13:00:23 -0800
Version	trunk
Hardware	PC Linux
CC	llvm-bugs@lists.llvm.org
Fixed by commit(s)
Attachments	ReedSolomon-c64369.zip (48660 bytes, application/zip)
Blocks
Blocked by
See also

Created attachment 12067
source file + script

Stack trace:

1.  <eof> parser at end of file
2.  Code generation
3.  Running pass 'Function Pass Manager' on module '/external/buildbot/clang-
native-arm-lnt/test-suite/SingleSource/Benchmarks/Misc/ReedSolomon.c'.
4.  Running pass 'Loop Pass Manager' on function '@rsdec_204'
5.  Running pass 'Loop Strength Reduction' on basic block '%vector.body129'

clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.5 (trunk 201465)
Target: armv7l-unknown-linux-gnueabihf

File and script attached.

[Quuxplusone]

Attached ReedSolomon-c64369.zip (48660 bytes, application/zip): source file + script

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Introduced by:

http://llvm.org/viewvc/llvm-project?revision=201465&view=revision

[Quuxplusone]

Thanks for the test case!

[Quuxplusone]

There were three or four failures, but I'm betting that they're all the same issue. ;)

[Quuxplusone]

Fixed in 201496.

Successful bot with patch: http://lab.llvm.org:8011/builders/clang-native-arm-
lnt/builds/5193.

The problem in this case was that LSR wanted to reuse an induction variable of
pointer type. I was missing the cast in this case.

[Quuxplusone]

Thanks!