[LLVMdev] llvm-stress for fuzzing llvm

Hal Finkel hfinkel at anl.gov
Sun Feb 26 16:29:52 PST 2012


Thanks, this is neat! Here is a patch which optionally enables
generation of the other floating-point types. Please review.


On Sun, 26 Feb 2012 11:51:04 +0000
"Rotem, Nadav" <nadav.rotem at intel.com> wrote:

> Hi, 
> Compiling lots of 'junk' helps in catching bugs.  I added a new tool
> (located under llvm/tools/llvm-stress) for generating random LL
> files.  The tool can be used to test different llvm components using
> various compilation flags.  Until now, I only found bugs in the
> codegen, and not in general llvm optimizations. This probably means
> that the generated tests are currently too simple for the
> higher-level optimizations. 
> The command line below generates a random ll file, and llc compiles
> this file. It often crashes. 
> ./llvm-stress -seed $RANDOM -o tmp.ll -size 1000 ; ./llc tmp.ll
> -mcpu=corei7-avx -mattr=+avx -o /dev/null 
> The "-seed" flag sets the initial seed to be used by the random
> function.  I implemented a simple portable 'random' function so that
> the result should be identical on all platforms. The initial seed
> also appears in the name of the generated function.  The "-size"
> parameter sets the size of the generated random file. 
> Nadav
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Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory
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