[LLVMdev] LLVM Loop Vectorizer is enabled by default???

[xtxwy jim]

     In http://llvm.org/docs/Vectorizers.html, it says "LLVM’s Loop
Vectorizer is now enabled by default for -O3". But I use the following
command: opt -O3 -debug-pass=Arguments test.ll -o /dev/null   I can't see
the "loop-vectorize" option in the result. Any advice ?
     My opt version is:
=====================================
$ opt --version
LLVM (http://llvm.org/):
  LLVM version 3.4svn
  DEBUG build with assertions.
  Built May 20 2013 (18:51:00).
  Default target: x86_64-unknown-linux-gnu
  Host CPU: corei7-avx
=====================================
     Thanks.
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