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cond15
2012 Sep 20
0
[LLVMdev] Instruction as Value in PHI
On Thu, Sep 20, 2012 at 3:18 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:
> Curious, is there a pass/mechanism that exists to promote an instruction
> that is a value of a PHI?
>
> For example, if one of the incoming values is a sub(x, y) from BB2, does
> there exist something to promote this instruction back to BB2 (such that tmp
> = sub(x,y)) and the PHI replaces the
2012 Sep 20
2
[LLVMdev] Instruction as Value in PHI
Curious, is there a pass/mechanism that exists to promote an instruction
that is a value of a PHI?
For example, if one of the incoming values is a sub(x, y) from BB2, does
there exist something to promote this instruction back to BB2 (such that
tmp = sub(x,y)) and the PHI replaces the sub instr with tmp?
Or is the above the natural state that is then optimized into using sub, is
there a call