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3311301
2014 Jun 11
2
[LLVMdev] -instcombine introduces "undef" values to the IR.
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
-------------- next
2014 Jun 11
2
[LLVMdev] -instcombine introduces "undef" values to the IR.
...act same behaviour as the input code for all cases where the input code
> had well defined behaviour. Anything else is a bug.
>
> Nick
>
>
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