From 903d278a9b7398d8905c90832e587e0556c52789 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 15 Jan 2006 08:54:32 +0000 Subject: [PATCH] Allow the target to specify 'expand' if they just require the amount to be subtracted from the stack pointer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25331 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 28 ++++++++++++++++-------- 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index 7903fa68d7c..5716a78d217 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -847,22 +847,32 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) { switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) { default: assert(0 && "This action is not supported yet!"); - case TargetLowering::Custom: { + case TargetLowering::Expand: { + unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore(); + assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and" + " not tell us which reg is the stack pointer!"); + SDOperand Chain = Tmp1.getOperand(0); + SDOperand Size = Tmp2.getOperand(1); + SDOperand SP = DAG.getCopyFromReg(Chain, SPReg, Node->getValueType(0)); + Tmp1 = DAG.getNode(ISD::SUB, Node->getValueType(0), SP, Size); // Value + Tmp2 = DAG.getCopyToReg(SP.getValue(1), SPReg, Tmp1); // Output chain + break; + } + case TargetLowering::Custom: Tmp3 = TLI.LowerOperation(Tmp1, DAG); if (Tmp3.Val) { Tmp1 = LegalizeOp(Tmp3); Tmp2 = LegalizeOp(Tmp3.getValue(1)); } - // FALLTHROUGH if the target thinks it is legal. - } + break; case TargetLowering::Legal: - // Since this op produce two values, make sure to remember that we - // legalized both of them. - AddLegalizedOperand(SDOperand(Node, 0), Tmp1); - AddLegalizedOperand(SDOperand(Node, 1), Tmp2); - return Op.ResNo ? Tmp2 : Tmp1; + break; } - assert(0 && "Unreachable"); + // Since this op produce two values, make sure to remember that we + // legalized both of them. + AddLegalizedOperand(SDOperand(Node, 0), Tmp1); + AddLegalizedOperand(SDOperand(Node, 1), Tmp2); + return Op.ResNo ? Tmp2 : Tmp1; } case ISD::TAILCALL: case ISD::CALL: {