From d34167a4abbe576bef7dbe1b88771f09afc82a72 Mon Sep 17 00:00:00 2001 From: Anton Korobeynikov Date: Fri, 8 May 2009 18:51:34 +0000 Subject: [PATCH] Do not emit bit tests if target does not support natively left shift git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71240 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp index fd89108392c..d0fd6b4f64c 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp @@ -1923,6 +1923,10 @@ bool SelectionDAGLowering::handleBitTestsSwitchCase(CaseRec& CR, // inserting any additional MBBs necessary to represent the switch. MachineFunction *CurMF = CurMBB->getParent(); + // If target does not have legal shift left, do not emit bit tests at all. + if (!TLI.isOperationLegal(ISD::SHL, TLI.getPointerTy())) + return false; + size_t numCmps = 0; for (CaseItr I = CR.Range.first, E = CR.Range.second; I!=E; ++I) { -- 2.34.1