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First draft of new Target interface
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19324 91177308-0d34-0410-b5e6-96231b3b80d8
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lib/CodeGen/SelectionDAG/TargetLowering.cpp
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48
lib/CodeGen/SelectionDAG/TargetLowering.cpp
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//===-- TargetLowering.cpp - Implement the TargetLowering class -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This implements the TargetLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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using namespace llvm;
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TargetLowering::TargetLowering(TargetMachine &tm)
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: TM(tm), TD(TM.getTargetData()) {
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assert(ISD::BUILTIN_OP_END <= 128 &&
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"Fixed size array in TargetLowering is not large enough!");
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IsLittleEndian = TD.isLittleEndian();
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PointerTy = getValueType(TD.getIntPtrType());
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memset(UnsupportedOps, 0, ISD::BUILTIN_OP_END*sizeof(short));
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memset(RegClassForVT, 0,MVT::LAST_VALUETYPE*sizeof(TargetRegisterClass*));
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}
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/// computeRegisterProperties - Once all of the register classes are added,
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/// this allows us to compute derived properties we expose.
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void TargetLowering::computeRegisterProperties() {
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// Everything defaults to one.
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for (unsigned i = 0; i != MVT::LAST_VALUETYPE; ++i)
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NumElementsForVT[i] = 1;
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// Find the largest integer register class.
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unsigned LargestIntReg = MVT::i128;
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for (; RegClassForVT[LargestIntReg] == 0; --LargestIntReg)
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assert(LargestIntReg != MVT::i1 && "No integer registers defined!");
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// Every integer value type larger than this largest register takes twice as
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// many registers to represent as the previous ValueType.
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unsigned ExpandedReg = LargestIntReg; ++LargestIntReg;
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for (++ExpandedReg; MVT::isInteger((MVT::ValueType)ExpandedReg);++ExpandedReg)
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NumElementsForVT[ExpandedReg] = 2*NumElementsForVT[ExpandedReg-1];
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}
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