[llvm-dev] No vectorization with -loop-vectorize and -slp-vectorizer

hameeza ahmed via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 14 02:21:41 PDT 2019

I am trying to test individual optimizations of opt on unoptimized IR. But,
the IR is not getting vectorized by using following commands.

Documents/clang+llvm-9.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang -O1
-Xclang -disable-llvm-passes -emit-llvm -S vecsum.c -o vecsum-noopt.ll

-loop-vectorize -slp-vectorizer -S vecsum-noopt.ll -o vecto.ll

Though IR gets vectorized with O3 flag. Even I tried to replicate O3
behavior via individual flags with opt. But It is not showing same IR.

Where am I doing mistake?

Please help

Thank You
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