[compiler-rt] r339303 - [libFuzzer] Increase the iteration limit in shrink.test

[Hans Wennborg via llvm-commits]

Merged to 7.0 in r339315.

On Thu, Aug 9, 2018 at 2:41 AM, George Karpenkov via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: george.karpenkov
> Date: Wed Aug  8 17:41:22 2018
> New Revision: 339303
>
> URL: http://llvm.org/viewvc/llvm-project?rev=339303&view=rev
> Log:
> [libFuzzer] Increase the iteration limit in shrink.test
>
> After https://reviews.llvm.org/D48800, shrink.test started failing on
> x86_64h architecture.
> Looking into this, the optimization pass is too eager to unroll the loop
> on x86_64h, possibly leading to worse coverage data.
>
> Alternative solutions include not unrolling the loop when fuzzing, or
> disabling this test on that architecture.
>
> Differential Revision: https://reviews.llvm.org/D50484
>
> Modified:
>     compiler-rt/trunk/test/fuzzer/shrink.test
>
> Modified: compiler-rt/trunk/test/fuzzer/shrink.test
> URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/test/fuzzer/shrink.test?rev=339303&r1=339302&r2=339303&view=diff
> ==============================================================================
> --- compiler-rt/trunk/test/fuzzer/shrink.test (original)
> +++ compiler-rt/trunk/test/fuzzer/shrink.test Wed Aug  8 17:41:22 2018
> @@ -1,6 +1,6 @@
>  RUN: %cpp_compiler %S/ShrinkControlFlowTest.cpp -o %t-ShrinkControlFlowTest
>  RUN: %cpp_compiler %S/ShrinkValueProfileTest.cpp -o %t-ShrinkValueProfileTest
> -RUN: %run %t-ShrinkControlFlowTest -seed=1 -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60 -runs=1000000  -shrink=1 -reduce_inputs=0 2>&1 | FileCheck %s --check-prefix=SHRINK1
> +RUN: %run %t-ShrinkControlFlowTest -seed=1 -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60 -runs=2000000  -shrink=1 -reduce_inputs=0 2>&1 | FileCheck %s --check-prefix=SHRINK1
>  # Limit max_len to run this negative test faster.
>  RUN: %run %t-ShrinkControlFlowTest -seed=1 -exit_on_item=0eb8e4ed029b774d80f2b66408203801cb982a60 -runs=1000000 -shrink=0 -reduce_inputs=0 -max_len=64 2>&1 | FileCheck %s --check-prefix=SHRINK0
>  RUN: %run %t-ShrinkValueProfileTest -seed=1 -exit_on_item=aea2e3923af219a8956f626558ef32f30a914ebc -runs=100000 -shrink=1 -reduce_inputs=0 -use_value_profile=1 2>&1 | FileCheck %s --check-prefix=SHRINK1_VP
>
>
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