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Hi, I'm trying to build code for very short function and I encounter with a problem (or bug) in DAG selection algotithm. I have a node that was created in Combine(BeforeLegalizeTypes) and should be optimized in Combine(AfterLegalizeTypes). But LegalizeTypes() did not change anything and Combine(AfterLegalizeTypes) was not called. Vector legalization that comes afterwards just scalarized the operation. SelectionDAGISel::CodeGenAndEmitDAG() .. CurDAG->Combine(BeforeLegalizeTypes, *AA, OptLevel); bool Changed; Changed...

...sky, Elena <elena.demikhovsky at intel.com> wrote: > Hi, > > I'm trying to build code for very short function and I encounter with a problem (or bug) in DAG selection algotithm. > I have a node that was created in Combine(BeforeLegalizeTypes) and should be optimized in Combine(AfterLegalizeTypes). But LegalizeTypes() did not change anything and Combine(AfterLegalizeTypes) was not called. > Vector legalization that comes afterwards just scalarized the operation. > > SelectionDAGISel::CodeGenAndEmitDAG() > .. >   CurDAG->Combine(BeforeLegalizeTypes, *AA, OptLevel); > &...

At the beginning, I have the following chain: LOAD -> TRUNCATE -> ZERO_EXTEND. After Combine(BeforeLegalizeTypes) the optimization of ZERO_EXTEND gives me the new chain LOAD -> ANY_EXTEND -> AND. I want to optimize ANY_EXTEND but is not analyzed in the same Combine(). Combine(AfterLegalizeTypes) is no called at all. - Elena -----Original Message----- From: Eli Friedman [mailto:eli.friedman at gmail.com] Sent: Tuesday, February 07, 2012 10:15 To: Demikhovsky, Elena Cc: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] DAG optimization and lowering algorithm On Mon, Feb 6, 2012 at 11:54...