[LLVMdev] [LLVM, llvm-diff] Question about FunctionDifferenceEngine and DiffConsumer::printValue
stpworld at narod.ru
Fri Oct 28 02:00:53 PDT 2011
I found next code when switch instruction differs:
Engine.logf("right switch has extra case %r") << CaseValue;
Where CaseValue is a ConstantInt object. Looking how logf works I found
that it invokes DiffConsumer::printValue method for CaseValue. And here
I found that CaseValue itself will never printed. On first look how
DiffConsumer::printValue works it seems that for all constants "object
numbering" should be printed:
out << '%' << ctxt.RNumbering[V]; // V = CaseValue in our case.
// RNumbering is instance of
Then I look into DiffConsumer.cpp, ComputeNumbering method that fills
RNumbering and LNumbering. Well, numbering computed for function
arguments, basic blocks and instructions only.
It means that for Constants "%0" will be printed always. If so, I
propose to add case for constants in DiffConsumer::printValue method,
that will print constant itself.
More information about the llvm-dev