[LLVMdev] "Instruction does not dominate all uses"

Rasha Omar rasha.sala7 at gmail.com
Sun Sep 8 03:23:15 PDT 2013

Hi Tim,

Instruction does not dominate all uses!
%5 = icmp ne i32 %4, 0
 br i1 %5, label %BB1, label %BB2
Broken module found, compilation aborted!

On 8 September 2013 11:58, Tim Northover <t.p.northover at gmail.com> wrote:

> Hi Rasha,
> > Instruction does not dominate all uses!
> There should be two instructions printed after that message. The first
> defines a value used by the second, but the message means there's some
> path through your function that can reach the second inst (the use)
> without the value being defined by the first instruction.
> At its simplest you probably want to decide what that value should be
> if the defining instruction isn't reached (maybe an initial loop
> value?), insert a phi node describing this and use that instead of the
> instruction that may not be executed.
> > Could you help for this ?
> Not without more information, I'm afraid. The fragment you posted has no
> issues.
> Cheers.
> Tim.

*     Rasha Salah Omar
     Msc Student at E-JUST
     Demonestrator  at Faculty of Computers and Informatics
     Benha University*

*     e-mail: rasha.omar at ejust.edu.eg*
 P* Please consider the environment before printing this email.*
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