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Add the padding needed for variable-size alloca's, which should work now.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6859 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2003-06-23 02:13:57 +00:00
parent ba38fe6d02
commit 80544444a3
1 changed files with 14 additions and 6 deletions
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20
lib/Target/SparcV9/SparcV9InstrSelection.cpp
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@ -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