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refactor all the constantexpr/instruction handling code out into a

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new FindMaximalLegalAddressingModeForOperation helper method.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60011 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-25 05:15:49 +00:00
parent 7ad1c7342b
commit bb3204a440
1 changed files with 68 additions and 65 deletions
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133
lib/Transforms/Scalar/CodeGenPrepare.cpp
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@ -573,61 +573,22 @@ static bool TryMatchingScaledValue(Value *ScaleReg, int64_t Scale,
return true;
}
/// FindMaximalLegalAddressingMode - If we can, try to merge the computation of
/// Addr into the specified addressing mode. If Addr can't be added to AddrMode
/// this returns false. This assumes that Addr is either a pointer type or
/// intptr_t for the target.
///
/// This method is used to optimize both load/store and inline asms with memory
/// operands.
static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
ExtAddrMode &AddrMode,
SmallVectorImpl<Instruction*> &AMI,
const TargetLowering &TLI,
unsigned Depth);
/// FindMaximalLegalAddressingModeForOperation - Given an instruction or
/// constant expr, see if we can fold the operation into the addressing mode.
/// If so, update the addressing mode and return true, otherwise return false.
static bool
FindMaximalLegalAddressingModeForOperation(User *AddrInst, unsigned Opcode,
const Type *AccessTy,
ExtAddrMode &AddrMode,
SmallVectorImpl<Instruction*> &AddrModeInsts,
const TargetLowering &TLI,
unsigned Depth) {
// If this is a global variable, fold it into the addressing mode if possible.
if (GlobalValue *GV = dyn_cast<GlobalValue>(Addr)) {
if (AddrMode.BaseGV == 0) {
AddrMode.BaseGV = GV;
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
AddrMode.BaseGV = 0;
}
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(Addr)) {
AddrMode.BaseOffs += CI->getSExtValue();
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
AddrMode.BaseOffs -= CI->getSExtValue();
} else if (isa<ConstantPointerNull>(Addr)) {
return true;
}
// Look through constant exprs and instructions.
unsigned Opcode = ~0U;
User *AddrInst = 0;
if (Instruction *I = dyn_cast<Instruction>(Addr)) {
Opcode = I->getOpcode();
AddrInst = I;
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Addr)) {
Opcode = CE->getOpcode();
AddrInst = CE;
}
// Limit recursion to avoid exponential behavior.
if (Depth == 5) { AddrInst = 0; Opcode = ~0U; }
// If this is really an instruction, add it to our list of related
// instructions.
if (Instruction *I = dyn_cast_or_null<Instruction>(AddrInst))
AddrModeInsts.push_back(I);
#if 0
if (AddrInst && !AddrInst->hasOneUse())
;
else
#endif
switch (Opcode) {
case Instruction::PtrToInt:
// PtrToInt is always a noop, as we know that the int type is pointer sized.
@ -653,18 +614,18 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
FindMaximalLegalAddressingMode(AddrInst->getOperand(0), AccessTy,
AddrMode, AddrModeInsts, TLI, Depth+1))
return true;
// Restore the old addr mode info.
AddrMode = BackupAddrMode;
AddrModeInsts.resize(OldSize);
// Otherwise this was over-aggressive. Try merging in the LHS then the RHS.
if (FindMaximalLegalAddressingMode(AddrInst->getOperand(0), AccessTy,
AddrMode, AddrModeInsts, TLI, Depth+1) &&
FindMaximalLegalAddressingMode(AddrInst->getOperand(1), AccessTy,
AddrMode, AddrModeInsts, TLI, Depth+1))
return true;
// Otherwise we definitely can't merge the ADD in.
AddrMode = BackupAddrMode;
AddrModeInsts.resize(OldSize);
@ -684,7 +645,7 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
int64_t Scale = RHS->getSExtValue();
if (Opcode == Instruction::Shl)
Scale = 1 << Scale;
if (TryMatchingScaledValue(AddrInst->getOperand(0), Scale, AccessTy,
AddrMode, AddrModeInsts, TLI, Depth))
return true;
@ -695,7 +656,7 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
// one variable offset.
int VariableOperand = -1;
unsigned VariableScale = 0;
int64_t ConstantOffset = 0;
const TargetData *TD = TLI.getTargetData();
gep_type_iterator GTI = gep_type_begin(AddrInst);
@ -703,7 +664,7 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
if (const StructType *STy = dyn_cast<StructType>(*GTI)) {
const StructLayout *SL = TD->getStructLayout(STy);
unsigned Idx =
cast<ConstantInt>(AddrInst->getOperand(i))->getZExtValue();
cast<ConstantInt>(AddrInst->getOperand(i))->getZExtValue();
ConstantOffset += SL->getElementOffset(Idx);
} else {
uint64_t TypeSize = TD->getABITypeSize(GTI.getIndexedType());
@ -715,18 +676,18 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
VariableOperand = -2;
break;
}
// Remember the variable index.
VariableOperand = i;
VariableScale = TypeSize;
}
}
}
// If the GEP had multiple variable indices, punt.
if (VariableOperand == -2)
break;
// A common case is for the GEP to only do a constant offset. In this case,
// just add it to the disp field and check validity.
if (VariableOperand == -1) {
@ -751,14 +712,14 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
AddrMode.BaseReg = AddrInst->getOperand(0);
SetBaseReg = true;
}
// See if the scale amount is valid for this target.
AddrMode.BaseOffs += ConstantOffset;
if (TryMatchingScaledValue(AddrInst->getOperand(VariableOperand),
VariableScale, AccessTy, AddrMode,
AddrModeInsts, TLI, Depth)) {
if (!SetBaseReg) return true;
// If this match succeeded, we know that we can form an address with the
// GepBase as the basereg. See if we can match *more*.
AddrMode.HasBaseReg = false;
@ -773,7 +734,7 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
AddrMode.BaseReg = AddrInst->getOperand(0);
return true;
}
AddrMode.BaseOffs -= ConstantOffset;
if (SetBaseReg) {
AddrMode.HasBaseReg = false;
@ -783,12 +744,54 @@ static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
break;
}
}
return false;
}
if (Instruction *I = dyn_cast_or_null<Instruction>(AddrInst)) {
assert(AddrModeInsts.back() == I && "Stack imbalance"); I = I;
AddrModeInsts.pop_back();
/// FindMaximalLegalAddressingMode - If we can, try to merge the computation of
/// Addr into the specified addressing mode. If Addr can't be added to AddrMode
/// this returns false. This assumes that Addr is either a pointer type or
/// intptr_t for the target.
///
/// This method is used to optimize both load/store and inline asms with memory
/// operands.
static bool FindMaximalLegalAddressingMode(Value *Addr, const Type *AccessTy,
ExtAddrMode &AddrMode,
SmallVectorImpl<Instruction*> &AddrModeInsts,
const TargetLowering &TLI,
unsigned Depth) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(Addr)) {
// Fold in immediates if legal for the target.
AddrMode.BaseOffs += CI->getSExtValue();
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
AddrMode.BaseOffs -= CI->getSExtValue();
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(Addr)) {
// If this is a global variable, fold it into the addressing mode if possible.
if (AddrMode.BaseGV == 0) {
AddrMode.BaseGV = GV;
if (TLI.isLegalAddressingMode(AddrMode, AccessTy))
return true;
AddrMode.BaseGV = 0;
}
} else if (Instruction *I = dyn_cast<Instruction>(Addr)) {
if (Depth < 5 && // Limit recursion to avoid exponential behavior.
FindMaximalLegalAddressingModeForOperation(I, I->getOpcode(),
AccessTy, AddrMode,
AddrModeInsts, TLI, Depth)) {
AddrModeInsts.push_back(I);
return true;
}
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Addr)) {
if (Depth < 5 && // Limit recursion to avoid exponential behavior.
FindMaximalLegalAddressingModeForOperation(CE, CE->getOpcode(),
AccessTy, AddrMode,
AddrModeInsts, TLI, Depth))
return true;
} else if (isa<ConstantPointerNull>(Addr)) {
return true;
}
// Worse case, the target should support [reg] addressing modes. :)
if (!AddrMode.HasBaseReg) {
AddrMode.HasBaseReg = true;