[LLVMdev] llvm-stress for fuzzing llvm

[Rotem, Nadav]

LGTM, please commit.

-----Original Message-----
From: Hal Finkel [mailto:hfinkel at anl.gov] 
Sent: Monday, February 27, 2012 02:30
To: Rotem, Nadav
Cc: llvmdev at cs.uiuc.edu
Subject: Re: [LLVMdev] llvm-stress for fuzzing llvm

Nadav,

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

 -Hal

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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