ConstantExpr Handling?

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1

Hi,

I was wondering how exactly LLVM handles the ConstantExpr, specifically GEP ConstantExpr, in code generation. From what I'm reading, translating these Constant Expressions into Instructions can slow the code, so I'd like to be able to handle ConstantExpr in the same way that LLVM code generation does.

Thanks,
Brandon

2

Hi Brandon,

I was wondering how exactly LLVM handles the ConstantExpr,
specifically GEP ConstantExpr, in code generation. From what I'm
reading, translating these Constant Expressions into Instructions can
slow the code, so I'd like to be able to handle ConstantExpr in the
same way that LLVM code generation does.

I think this is handled in lib/CodeGen/AsmPrinter/AsmPrinter.cpp in the
LowerConstant method. It looks like it only handles the case where the
GEP indices are explicit integers (ConstantInt).

Ciao, Duncan.