[LLVMdev] Instruction does not dominate all uses

Eli Friedman eli.friedman at gmail.com
Tue Jun 17 09:06:55 PDT 2008

On Tue, Jun 17, 2008 at 8:29 AM, Gary Benson <gbenson at redhat.com> wrote:
> Hi all,
> I'm getting a weird error if I run llc on the attached module.
> Did I do something wrong (llc says the module is broken, also
> attached) or is this a bug?

The module appears to be malformed.  Essentially, what the error
message means is that there is some path through the function that
reaches a use of a variable without passing through the definition,
which is illegal in SSA form.

http://llvm.org/docs/tutorial/LangImpl7.html might be useful for
understanding SSA form, and how to generate it easily.


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