llvm dev - May 2018 - Proper way to lower all ConstantExprs?

Hi:
For my own Transform passes I need to lower all ConstantExpressions into
Instructions in order to conveniently analyze the use-def def-use chains and
operand comparisons. Could anyone possibly kindly share some insights on if
there is any standard way to do this without crafting my own implementation and
if not, should we add this feature into LLVM upstream?

Zhang

On 5/30/2018 7:21 PM, mayuyu.io via llvm-dev wrote:
> Hi:
> For my own Transform passes I need to lower all ConstantExpressions into
Instructions in order to conveniently analyze the use-def def-use chains and
operand comparisons. Could anyone possibly kindly share some insights on if
there is any standard way to do this without crafting my own implementation and
if not, should we add this feature into LLVM upstream?
There's a helper ConstantExpr::getAsInstruction to create an Instruction 
for a given ConstantExpr.  I don't think there's any code to do this for
*all* ConstantExprs/ConstantAggregates used by a given function; if you 
think you need this, you might want to reconsider your approach.  
(Recursively visiting constant expressions isn't very hard, if you need it.)

-Eli

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