https://llvm.org/bugs/show_bug.cgi?id=28828
Bug ID: 28828
Summary: Loop unrolling lead to program crash
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: feishenni...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16869
--> https://llvm.org/bugs/attachment.cgi?id=16869&action=edit
The original program, in .ll form
Running the trunk version of the loop unroller will transform a non-crashing
program into a crashing one.
Here's how the original program behaves:
> llc test.ll -o test.s
> g++ test.s -o test
> ./test
// Program terminates normally
Here's how the loop-unrolled program behaves:
> opt test.ll -loop-unroll -o test_opt.bc
> llc test_opt.bc -o test_opt.s
> g++ test_opt.s -o test_opt
> ./test_opt
// Segmentation fault
I can reproduce the issue on two different Linux platforms: RHEL 7.2 and Ubuntu
14.04. Both platform use gcc 5.3 toolchain.
Also, I am not able to shrink the test case further using bugpoint due to an
unfixed bug in bugpoint itself: https://llvm.org/bugs/show_bug.cgi?id=28803
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