Dan Gohman 3c9b5f394b Don't narrow the load and store in a load+twiddle+store sequence unless ...

there are clearly no stores between the load and the store. This fixes
this miscompile reported as PR7833.

This breaks the test/CodeGen/X86/narrow_op-2.ll optimization, which is
safe, but awkward to prove safe. Move it to X86's README.txt.

llvm-svn: 112861

2010-09-02 21:18:42 +00:00

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