[LLVMdev] -instcombine introduces "undef" values to the IR.

[Paul Vario]

Hi Fellows,

     If a .ll file contains no "undef"'s, does it necessarily mean that
every value is properly initialized before use in the IR? What confuses me
is that I notice that -instcombine can introduce "undef" to the previously
undef-clean .ll file ... is it always safe to use -instcombine  as one of
the preprocessing pass? Thanks.

Best,
Paul
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