From 80544444a300fa374a8a46d06d1f910b9da5516c Mon Sep 17 00:00:00 2001 From: "Vikram S. Adve" Date: Mon, 23 Jun 2003 02:13:57 +0000 Subject: [PATCH] Add the padding needed for variable-size alloca's, which should work now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6859 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/SparcV9/SparcV9InstrSelection.cpp | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/lib/Target/SparcV9/SparcV9InstrSelection.cpp b/lib/Target/SparcV9/SparcV9InstrSelection.cpp index e5ea7e82b2d..6576ef96cec 100644 --- a/lib/Target/SparcV9/SparcV9InstrSelection.cpp +++ b/lib/Target/SparcV9/SparcV9InstrSelection.cpp @@ -1051,19 +1051,27 @@ CreateCodeForVariableSizeAlloca(const TargetMachine& target, Value* tsizeVal = ConstantSInt::get(Type::IntTy, tsize); // Create temporary values to hold the result of MUL, SLL, SRL - // THIS CASE IS INCOMPLETE AND WILL BE FIXED SHORTLY. + // To pad `size' to next smallest multiple of 16: + // size = (size + 15) & (-16 = 0xfffffffffffffff0) + // TmpInstruction* tmpProd = new TmpInstruction(mcfi,numElementsVal, tsizeVal); - TmpInstruction* tmpSLL = new TmpInstruction(mcfi,numElementsVal, tmpProd); - TmpInstruction* tmpSRL = new TmpInstruction(mcfi,numElementsVal, tmpSLL); + TmpInstruction* tmpAdd15= new TmpInstruction(mcfi,numElementsVal, tmpProd); + TmpInstruction* tmpAndf0= new TmpInstruction(mcfi,numElementsVal, tmpAdd15); // Instruction 1: mul numElements, typeSize -> tmpProd // This will optimize the MUL as far as possible. - CreateMulInstruction(target, F, numElementsVal, tsizeVal, tmpProd,getMvec, + CreateMulInstruction(target, F, numElementsVal, tsizeVal, tmpProd, getMvec, mcfi, INVALID_MACHINE_OPCODE); - assert(0 && "Need to insert padding instructions here!"); + // Instruction 2: andn tmpProd, 0x0f -> tmpAndn + getMvec.push_back(BuildMI(V9::ADDi, 3).addReg(tmpProd).addSImm(15) + .addReg(tmpAdd15, MOTy::Def)); - totalSizeVal = tmpProd; + // Instruction 3: add tmpAndn, 0x10 -> tmpAdd16 + getMvec.push_back(BuildMI(V9::ANDi, 3).addReg(tmpAdd15).addSImm(-16) + .addReg(tmpAndf0, MOTy::Def)); + + totalSizeVal = tmpAndf0; } // Get the constant offset from SP for dynamically allocated storage