[llvm-dev] llvm Branch instruction using SplitBlockAndInsertIfThenElse

[Yasser NEZZARI via llvm-dev]

Hello everyone, 

I'm trying to build an LLVM pass that splits the BasicBlock and make a decision using "SplitBlockAndInsertIfThenElse" every time a binary operation is encountered, however this only allows me to split once (split at the 1st binop). could you please help me make it iterate through all the binop instructions? Knowing that changing the position of "break;" gives me errors when running the pass. same thing happens when I put the "SplitBlockAndInsertIfThenElse" in a nested loop. Here is my code:
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)

 {

 if (auto *op = dyn_cast<BinaryOperator>(&*I)) 
 {
   IRBuilder<> Builder(op);
   Value *lhs = op->getOperand(0);
   Value *rhs = op->getOperand(1); 
   Value *xpv = Builder.CreateAlloca(llvm::Type::getInt32Ty(llvm::getGlobalContext()), nullptr, "x");  
   Value *xpv2 = Builder.CreateAlloca(llvm::Type::getInt32Ty(llvm::getGlobalContext()), nullptr, "x2");

   Value *add1 = Builder.CreateAdd(lhs, rhs);
   Value *add2 = Builder.CreateAdd(lhs, rhs);
   Value *icmp1 = Builder.CreateICmpEQ(add1, add2);

   TerminatorInst *ThenTerm , *ElseTerm ;

   SplitBlockAndInsertIfThenElse(icmp1, op, &ThenTerm, &ElseTerm,nullptr);
   Builder.SetInsertPoint(ThenTerm);
   Value *xp1 = Builder.CreateStore(add1, xpv);
   Builder.SetInsertPoint(ElseTerm);
   break ;  
 }
} 		 	   		  
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