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PR400 phase 2. Propagate attributed load/store information through DAGs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36356 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Christopher Lamb 2007-04-22 23:15:30 +00:00
parent 7d2cc2b983
commit 95c218a83e
5 changed files with 122 additions and 41 deletions
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11
include/llvm/CodeGen/SelectionDAG.h
View File

@ -311,10 +311,12 @@ public:
/// determined by their operands, and they produce a value AND a token chain.
///
SDOperand getLoad(MVT::ValueType VT, SDOperand Chain, SDOperand Ptr,
const Value *SV, int SVOffset, bool isVolatile=false);
const Value *SV, int SVOffset, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr, const Value *SV,
int SVOffset, MVT::ValueType EVT, bool isVolatile=false);
int SVOffset, MVT::ValueType EVT, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM);
SDOperand getVecLoad(unsigned Count, MVT::ValueType VT, SDOperand Chain,
@ -323,10 +325,11 @@ public:
/// getStore - Helper function to build ISD::STORE nodes.
///
SDOperand getStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
const Value *SV, int SVOffset, bool isVolatile=false);
const Value *SV, int SVOffset, bool isVolatile=false,
unsigned Alignment=0);
SDOperand getTruncStore(SDOperand Chain, SDOperand Val, SDOperand Ptr,
const Value *SV, int SVOffset, MVT::ValueType TVT,
bool isVolatile=false);
bool isVolatile=false, unsigned Alignment=0);
SDOperand getIndexedStore(SDOperand OrigStoe, SDOperand Base,
SDOperand Offset, ISD::MemIndexedMode AM);

4
include/llvm/CodeGen/SelectionDAGNodes.h
View File

@ -1438,7 +1438,7 @@ protected:
friend class SelectionDAG;
LoadSDNode(SDOperand *ChainPtrOff, SDVTList VTs,
ISD::MemIndexedMode AM, ISD::LoadExtType ETy, MVT::ValueType LVT,
const Value *SV, int O=0, unsigned Align=1, bool Vol=false)
const Value *SV, int O=0, unsigned Align=0, bool Vol=false)
: SDNode(ISD::LOAD, VTs),
AddrMode(AM), ExtType(ETy), LoadedVT(LVT), SrcValue(SV), SVOffset(O),
Alignment(Align), IsVolatile(Vol) {
@ -1446,6 +1446,7 @@ protected:
Ops[1] = ChainPtrOff[1]; // Ptr
Ops[2] = ChainPtrOff[2]; // Off
InitOperands(Ops, 3);
assert(Align != 0 && "Loads should have non-zero aligment");
assert((getOffset().getOpcode() == ISD::UNDEF ||
AddrMode != ISD::UNINDEXED) &&
"Only indexed load has a non-undef offset operand");
@ -1508,6 +1509,7 @@ protected:
Ops[2] = ChainValuePtrOff[2]; // Ptr
Ops[3] = ChainValuePtrOff[3]; // Off
InitOperands(Ops, 4);
assert(Align != 0 && "Stores should have non-zero aligment");
assert((getOffset().getOpcode() == ISD::UNDEF ||
AddrMode != ISD::UNINDEXED) &&
"Only indexed store has a non-undef offset operand");

70
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -1263,7 +1263,9 @@ SDOperand DAGCombiner::visitAND(SDNode *N) {
(!AfterLegalize || TLI.isLoadXLegal(ISD::ZEXTLOAD, EVT))) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
@ -1280,7 +1282,9 @@ SDOperand DAGCombiner::visitAND(SDNode *N) {
(!AfterLegalize || TLI.isLoadXLegal(ISD::ZEXTLOAD, EVT))) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
@ -1320,7 +1324,8 @@ SDOperand DAGCombiner::visitAND(SDNode *N) {
AddToWorkList(NewPtr.Val);
SDOperand Load =
DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT);
LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.Val, Load, Load.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
@ -2120,7 +2125,8 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType());
N0.getValueType(),
LN0->isVolatile());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2136,7 +2142,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
if (!AfterLegalize || TLI.isLoadXLegal(ISD::SEXTLOAD, EVT)) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2212,7 +2220,9 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType());
N0.getValueType(),
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2227,7 +2237,9 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
MVT::ValueType EVT = LN0->getLoadedVT();
SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2303,7 +2315,9 @@ SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType());
N0.getValueType(),
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2321,7 +2335,9 @@ SDOperand DAGCombiner::visitANY_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(LN0->getExtensionType(), VT,
LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -2398,9 +2414,11 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) {
AddToWorkList(NewPtr.Val);
SDOperand Load = (ExtType == ISD::NON_EXTLOAD)
? DAG.getLoad(VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset())
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), LN0->getAlignment())
: DAG.getExtLoad(ExtType, VT, LN0->getChain(), NewPtr,
LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT);
LN0->getSrcValue(), LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
if (CombineSRL) {
std::vector<SDNode*> NowDead;
@ -2479,7 +2497,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
@ -2492,7 +2512,9 @@ SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(), EVT);
LN0->getSrcValueOffset(), EVT,
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand(N, 0); // Return N so it doesn't get rechecked!
@ -2552,7 +2574,8 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
if (0 && ISD::isNON_EXTLoad(N0.Val) && N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
SDOperand Load = DAG.getLoad(VT, LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(), LN0->getSrcValueOffset());
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), LN0->getAlignment());
AddToWorkList(N);
CombineTo(N0.Val, DAG.getNode(ISD::BIT_CONVERT, N0.getValueType(), Load),
Load.getValue(1));
@ -2942,7 +2965,9 @@ SDOperand DAGCombiner::visitFP_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::EXTLOAD, VT, LN0->getChain(),
LN0->getBasePtr(), LN0->getSrcValue(),
LN0->getSrcValueOffset(),
N0.getValueType());
N0.getValueType(),
LN0->isVolatile(),
LN0->getAlignment());
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::FP_ROUND, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
@ -3331,13 +3356,16 @@ SDOperand DAGCombiner::visitLOAD(SDNode *N) {
// Replace the chain to void dependency.
if (LD->getExtensionType() == ISD::NON_EXTLOAD) {
ReplLoad = DAG.getLoad(N->getValueType(0), BetterChain, Ptr,
LD->getSrcValue(), LD->getSrcValueOffset());
LD->getSrcValue(), LD->getSrcValueOffset(),
LD->isVolatile(), LD->getAlignment());
} else {
ReplLoad = DAG.getExtLoad(LD->getExtensionType(),
LD->getValueType(0),
BetterChain, Ptr, LD->getSrcValue(),
LD->getSrcValueOffset(),
LD->getLoadedVT());
LD->getLoadedVT(),
LD->isVolatile(),
LD->getAlignment());
}
// Create token factor to keep old chain connected.
@ -4040,13 +4068,17 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDOperand LHS,
if (LLD->getExtensionType() == ISD::NON_EXTLOAD)
Load = DAG.getLoad(TheSelect->getValueType(0), LLD->getChain(),
Addr,LLD->getSrcValue(),
LLD->getSrcValueOffset());
LLD->getSrcValueOffset(),
LLD->isVolatile(),
LLD->getAlignment());
else {
Load = DAG.getExtLoad(LLD->getExtensionType(),
TheSelect->getValueType(0),
LLD->getChain(), Addr, LLD->getSrcValue(),
LLD->getSrcValueOffset(),
LLD->getLoadedVT());
LLD->getLoadedVT(),
LLD->isVolatile(),
LLD->getAlignment());
}
// Users of the select now use the result of the load.
CombineTo(TheSelect, Load);

66
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
View File

@ -15,11 +15,13 @@
#include "llvm/Constants.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Intrinsics.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
@ -1538,9 +1540,7 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT,
SDOperand SelectionDAG::getLoad(MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr,
const Value *SV, int SVOffset,
bool isVolatile) {
// FIXME: Alignment == 1 for now.
unsigned Alignment = 1;
bool isVolatile, unsigned Alignment) {
SDVTList VTs = getVTList(VT, MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Ptr, Undef };
@ -1556,6 +1556,18 @@ SDOperand SelectionDAG::getLoad(MVT::ValueType VT,
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::Vector && VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for load must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for load");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDNode *N = new LoadSDNode(Ops, VTs, ISD::UNINDEXED,
ISD::NON_EXTLOAD, VT, SV, SVOffset, Alignment,
isVolatile);
@ -1568,7 +1580,7 @@ SDOperand SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
SDOperand Chain, SDOperand Ptr,
const Value *SV,
int SVOffset, MVT::ValueType EVT,
bool isVolatile) {
bool isVolatile, unsigned Alignment) {
// If they are asking for an extending load from/to the same thing, return a
// normal load.
if (VT == EVT)
@ -1583,8 +1595,6 @@ SDOperand SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
assert(MVT::isInteger(VT) == MVT::isInteger(EVT) &&
"Cannot convert from FP to Int or Int -> FP!");
// FIXME: Alignment == 1 for now.
unsigned Alignment = 1;
SDVTList VTs = getVTList(VT, MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Ptr, Undef };
@ -1600,6 +1610,18 @@ SDOperand SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT::ValueType VT,
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::Vector && VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for load must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for load");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDNode *N = new LoadSDNode(Ops, VTs, ISD::UNINDEXED, ExtType, EVT,
SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
@ -1647,11 +1669,9 @@ SDOperand SelectionDAG::getVecLoad(unsigned Count, MVT::ValueType EVT,
SDOperand SelectionDAG::getStore(SDOperand Chain, SDOperand Val,
SDOperand Ptr, const Value *SV, int SVOffset,
bool isVolatile) {
bool isVolatile, unsigned Alignment) {
MVT::ValueType VT = Val.getValueType();
// FIXME: Alignment == 1 for now.
unsigned Alignment = 1;
SDVTList VTs = getVTList(MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Val, Ptr, Undef };
@ -1667,6 +1687,18 @@ SDOperand SelectionDAG::getStore(SDOperand Chain, SDOperand Val,
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::Vector && VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for store must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for store");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, false,
VT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);
@ -1677,7 +1709,7 @@ SDOperand SelectionDAG::getStore(SDOperand Chain, SDOperand Val,
SDOperand SelectionDAG::getTruncStore(SDOperand Chain, SDOperand Val,
SDOperand Ptr, const Value *SV,
int SVOffset, MVT::ValueType SVT,
bool isVolatile) {
bool isVolatile, unsigned Alignment) {
MVT::ValueType VT = Val.getValueType();
bool isTrunc = VT != SVT;
@ -1685,8 +1717,6 @@ SDOperand SelectionDAG::getTruncStore(SDOperand Chain, SDOperand Val,
assert(MVT::isInteger(VT) == MVT::isInteger(SVT) &&
"Can't do FP-INT conversion!");
// FIXME: Alignment == 1 for now.
unsigned Alignment = 1;
SDVTList VTs = getVTList(MVT::Other);
SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
SDOperand Ops[] = { Chain, Val, Ptr, Undef };
@ -1702,6 +1732,18 @@ SDOperand SelectionDAG::getTruncStore(SDOperand Chain, SDOperand Val,
void *IP = 0;
if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
return SDOperand(E, 0);
if (Alignment == 0) { // Ensure that codegen never sees alignment 0
const Type *Ty = 0;
if (VT != MVT::Vector && VT != MVT::iPTR) {
Ty = MVT::getTypeForValueType(VT);
} else if (SV) {
const PointerType *PT = dyn_cast<PointerType>(SV->getType());
assert(PT && "Value for store must be a pointer");
Ty = PT->getElementType();
}
assert(Ty && "Could not get type information for store");
Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
}
SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, isTrunc,
SVT, SV, SVOffset, Alignment, isVolatile);
CSEMap.InsertNode(N, IP);

12
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -498,7 +498,7 @@ public:
SDOperand getLoadFrom(const Type *Ty, SDOperand Ptr,
const Value *SV, SDOperand Root,
bool isVolatile);
bool isVolatile, unsigned Alignment);
SDOperand getIntPtrConstant(uint64_t Val) {
return DAG.getConstant(Val, TLI.getPointerTy());
@ -2313,19 +2313,21 @@ void SelectionDAGLowering::visitLoad(LoadInst &I) {
}
setValue(&I, getLoadFrom(I.getType(), Ptr, I.getOperand(0),
Root, I.isVolatile()));
Root, I.isVolatile(), I.getAlignment()));
}
SDOperand SelectionDAGLowering::getLoadFrom(const Type *Ty, SDOperand Ptr,
const Value *SV, SDOperand Root,
bool isVolatile) {
bool isVolatile,
unsigned Alignment) {
SDOperand L;
if (const VectorType *PTy = dyn_cast<VectorType>(Ty)) {
MVT::ValueType PVT = TLI.getValueType(PTy->getElementType());
L = DAG.getVecLoad(PTy->getNumElements(), PVT, Root, Ptr,
DAG.getSrcValue(SV));
} else {
L = DAG.getLoad(TLI.getValueType(Ty), Root, Ptr, SV, 0, isVolatile);
L = DAG.getLoad(TLI.getValueType(Ty), Root, Ptr, SV, 0,
isVolatile, Alignment);
}
if (isVolatile)
@ -2342,7 +2344,7 @@ void SelectionDAGLowering::visitStore(StoreInst &I) {
SDOperand Src = getValue(SrcV);
SDOperand Ptr = getValue(I.getOperand(1));
DAG.setRoot(DAG.getStore(getRoot(), Src, Ptr, I.getOperand(1), 0,
I.isVolatile()));
I.isVolatile(), I.getAlignment()));
}
/// IntrinsicCannotAccessMemory - Return true if the specified intrinsic cannot