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Borja, In this situation, you need to find the place where shl is generated and add a check to see if shl is legal before allowing it to do the transform. Micah From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Borja Ferrer Sent: Sunday, August 26, 2012 11:49 AM To: llvmdev at cs.uiuc.edu Subject: [LLVMdev] Illegal node introduced by DAGCombiner after

Hello, I'm getting an instruction selection error because DAGCombiner is introducing an illegal node after the legalizeDAG phase. Basically this is what is going on: 1) During legalization, BR_JT gets expanded introducing a (mul x, 2). 2) After legalization (AfterLegalizeDAG), that (mul x, 2) is converted to an (shl x, 1). However, that shl node introduced is illegal, and since my custom