[llvm-dev] Polly Vectorization very large speedup

[hameeza ahmed via llvm-dev]

Hello,
I have run polybench correlation with following command on LLVM-12.0;
/home/clang+llvm-12.0.0-x86_64-linux-gnu-ubuntu-16.04/bin/clang -O3 -mllvm
-polly -mllvm -polly-vectorizer=polly -I ../../../../utilities -I
../../../../datamining/correlation ../../../../utilities/polybench.c
../../../../datamining/correlation/correlation.c -lm -DPOLYBENCH_TIME
 -DEXTRALARGE_DATASET -o polly-O3-vector-extralarge


I am getting execution time of 0.100884s with polly-vectorizer
However with LLVM -O3 time is 85.083153s
polly vectorizer gives a speedup of 843.37x which is unbelievable.
Why is that so? Am I running wrong command?

Please guide.

Thank You
Regards
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