[llvm-dev] After InstCombine pass, expected output got changed (original) (raw)

Rohit Aggarwal via llvm-dev llvm-dev at lists.llvm.org
Wed Aug 18 13:21:56 PDT 2021

Hi All,

I am running the instcombine pass on the given lR and executing the binary.

./build_release13x/bin/opt -enable-new-pm=false -instcombine sample.ll -S -o sample_instcombined_llvm.ll && ./build_release13x/bin/clang sample_instcombined_llvm.ll && ./a.out

But before passing to instcombine, the output is CE6DB4AC and after passing to instcombine value changes to 3B83FBC.

I tried to debug the issue and found that due to the occurence of poison value, some instructions(or, store,..) are getting deleted/erased.

I also observed that there are active changes happening related to poison values in the community. Is this behaviour expected one? Or Could it be a side effect of those changes?

Thanks and Regards, Rohit Aggarwal Compiler Engineer - AMD

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