diff options
| author | Chris Lattner <sabre@nondot.org> | 2005-09-02 00:19:37 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-09-02 00:19:37 +0000 |
| commit | fab08875b73656f373b10a59aad475615df82baf (patch) | |
| tree | 0c79675c129eb92c22df271a296a48df5a6b769a | |
| parent | 13c78e2e5f158e9008b279b43b685ff02bb3cbea (diff) | |
For values that are live across basic blocks and need promotion, use ANY_EXTEND
instead of ZERO_EXTEND to eliminate extraneous extensions. This eliminates
dead zero extensions on formal arguments and other cases on PPC, implementing
the newly tightened up test/Regression/CodeGen/PowerPC/small-arguments.ll test.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23205 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index 4121e400bc..3ed7f60ec4 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -491,7 +491,7 @@ void SelectionDAGLowering::visitBinary(User &I, unsigned Opcode, bool isShift) { SDOperand Op2 = getValue(I.getOperand(1)); if (isShift) - Op2 = DAG.getNode(ISD::ZERO_EXTEND, TLI.getShiftAmountTy(), Op2); + Op2 = DAG.getNode(ISD::ANY_EXTEND, TLI.getShiftAmountTy(), Op2); setValue(&I, DAG.getNode(Opcode, Op1.getValueType(), Op1, Op2)); } @@ -1025,7 +1025,7 @@ CopyValueToVirtualRegister(SelectionDAGLowering &SDL, Value *V, unsigned Reg) { if (MVT::isFloatingPoint(SrcVT)) Op = DAG.getNode(ISD::FP_EXTEND, DestVT, Op); else - Op = DAG.getNode(ISD::ZERO_EXTEND, DestVT, Op); + Op = DAG.getNode(ISD::ANY_EXTEND, DestVT, Op); return DAG.getCopyToReg(SDL.getRoot(), Reg, Op); } else { // The src value is expanded into multiple registers. @@ -1078,14 +1078,9 @@ LowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL, if (!AI->use_empty()) { SDL.setValue(AI, Args[a]); - if (0 && IsOnlyUsedInOneBasicBlock(AI) == F.begin()) { - // Only used in the entry block, no need to copy it to a vreg for - // other blocks. - } else { - SDOperand Copy = - CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); - UnorderedChains.push_back(Copy); - } + SDOperand Copy = + CopyValueToVirtualRegister(SDL, AI, FuncInfo.ValueMap[AI]); + UnorderedChains.push_back(Copy); } } else { // Otherwise, if any argument is only accessed in a single basic block, |