[llvm-bugs] [Bug 26882] New: Compiler flags' combination leads to segfault

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26882

            Bug ID: 26882
           Summary: Compiler flags' combination leads to segfault
           Product: libraries
           Version: 3.8
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: tulipawn at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

It seems explicit cpu and interleave values don't go too well together.

$ rustc -O -C target-cpu=cortex-a5 -C
llvm-args=-force-target-max-vector-interleave=0 main.rs

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb2eb52a0 (LWP 28076)]
0xb3576404 in llvm::IRBuilder<true, llvm::ConstantFolder,
llvm::IRBuilderDefaultInserter<true> >::CreateExtractElement(llvm::Value*,
llvm::Value*, llvm::Twine const&) ()
   from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
(gdb) bt
#0  0xb3576404 in llvm::IRBuilder<true, llvm::ConstantFolder,
llvm::IRBuilderDefaultInserter<true> >::CreateExtractElement(llvm::Value*,
llvm::Value*, llvm::Twine const&) ()
   from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
#1  0xb3585c14 in (anonymous
namespace)::InnerLoopVectorizer::vectorizeMemoryInstruction(llvm::Instruction*)
() from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
#2  0xb3583dfc in (anonymous
namespace)::InnerLoopVectorizer::vectorizeBlockInLoop(llvm::BasicBlock*,
llvm::SmallVector<llvm::PHINode*, 4u>*) ()
   from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
#3  0xb35889a8 in (anonymous namespace)::InnerLoopVectorizer::vectorizeLoop()
()
   from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
#4  0xb358c7c8 in (anonymous
namespace)::LoopVectorize::processLoop(llvm::Loop*) ()
   from /home/odroid/rust-nightly-sysalloc/bin/../lib/librustc_llvm-9026086f.so
#5  0xaf904680 in ?? ()

Not using an explicit -mcpu doesn't lead to the crash even with
`force-target-max-vector-interleave` set to zero. While that particular value
might not make  much sense it should be handled more gracefully :)

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