[LLVMdev] where are my phi-nodes?
Fariborz Jahanian
fjahanian at apple.com
Mon Sep 13 11:43:02 PDT 2010
On Sep 13, 2010, at 11:11 AM, John McCall wrote:
> On Sep 13, 2010, at 10:58 AM, Fariborz Jahanian wrote:
>>
> We do emit phis when the semantics aren't defined in terms of memory,
> e.g. with expressions that have multiple paths of control flow (like
> the
> conditional operator or null-checked derived-to-base conversions).
But at least for conditional operator, there are labels, conditionals
and branches.
Optimizer should be able to build the phi nodes from control flow. I
don't know
why not. But I am sure there is good reason for it being in the fe.
(maybe it makes
optimizer's work easier).
- fariborz
>
>
> John.
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