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Add support for cast instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35734 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2007-04-07 15:48:32 +00:00
parent e32157c609
commit ac4d664d45
1 changed files with 75 additions and 17 deletions
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92
lib/Transforms/Scalar/PredicateSimplifier.cpp
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@ -813,6 +813,14 @@ namespace {
return Range;
}
#ifndef NDEBUG
bool isCanonical(Value *V, ETNode *Subtree, VRPSolver *VRP);
#endif
public:
explicit ValueRanges(TargetData *TD) : TD(TD) {}
// rangeFromValue - converts a Value into a range. If the value is a
// constant it constructs the single element range, otherwise it performs
// a lookup. The width W must be retrieved from typeToWidth and may not
@ -842,14 +850,6 @@ namespace {
return 0;
}
#ifndef NDEBUG
bool isCanonical(Value *V, ETNode *Subtree, VRPSolver *VRP);
#endif
public:
explicit ValueRanges(TargetData *TD) : TD(TD) {}
bool isRelatedBy(Value *V1, Value *V2, ETNode *Subtree, LatticeVal LV) {
uint32_t W = typeToWidth(V1->getType());
if (!W) return false;
@ -907,6 +907,7 @@ namespace {
void addToWorklist(Value *V, Constant *C, ICmpInst::Predicate Pred,
VRPSolver *VRP);
void markBlock(VRPSolver *VRP);
void mergeInto(Value **I, unsigned n, Value *New, ETNode *Subtree,
VRPSolver *VRP) {
@ -946,7 +947,14 @@ namespace {
}
}
update(V, CR, Subtree);
ConstantRange Merged = CR.intersectWith(
rangeFromValue(V, Subtree, CR.getBitWidth()));
if (Merged.isEmptySet()) {
markBlock(VRP);
return;
}
update(V, Merged, Subtree);
}
void addNotEquals(Value *V1, Value *V2, ETNode *Subtree, VRPSolver *VRP) {
@ -1608,8 +1616,29 @@ namespace {
add(Ptr, Constant::getNullValue(Ptr->getType()), ICmpInst::ICMP_NE,
NewContext);
}
} else if (CastInst *CI = dyn_cast<CastInst>(I)) {
const Type *SrcTy = CI->getSrcTy();
Value *TheCI = IG.canonicalize(CI, Top);
uint32_t W = VR.typeToWidth(SrcTy);
if (!W) return;
ConstantRange CR = VR.rangeFromValue(TheCI, Top, W);
if (CR.isFullSet()) return;
switch (CI->getOpcode()) {
default: break;
case Instruction::ZExt:
case Instruction::SExt:
VR.applyRange(IG.canonicalize(CI->getOperand(0), Top),
CR.truncate(W), Top, this);
break;
case Instruction::BitCast:
VR.applyRange(IG.canonicalize(CI->getOperand(0), Top),
CR, Top, this);
break;
}
}
// TODO: CastInst "%a = cast ... %b" where %a is EQ or NE a constant.
}
/// opsToDef - A new relationship was discovered involving one of this
@ -1639,7 +1668,7 @@ namespace {
assert(!Ty->isFPOrFPVector() && "Float in work queue!");
Constant *Zero = Constant::getNullValue(Ty);
Constant *AllOnes = ConstantInt::getAllOnesValue(Ty);
ConstantInt *AllOnes = ConstantInt::getAllOnesValue(Ty);
switch (Opcode) {
default: break;
@ -1753,16 +1782,41 @@ namespace {
add(SI, SI->getTrueValue(), ICmpInst::ICMP_EQ, NewContext);
}
} else if (CastInst *CI = dyn_cast<CastInst>(I)) {
const Type *Ty = CI->getDestTy();
if (Ty->isFPOrFPVector()) return;
const Type *DestTy = CI->getDestTy();
if (DestTy->isFPOrFPVector()) return;
if (Constant *C = dyn_cast<Constant>(
IG.canonicalize(CI->getOperand(0), Top))) {
add(CI, ConstantExpr::getCast(CI->getOpcode(), C, Ty),
Value *Op = IG.canonicalize(CI->getOperand(0), Top);
Instruction::CastOps Opcode = CI->getOpcode();
if (Constant *C = dyn_cast<Constant>(Op)) {
add(CI, ConstantExpr::getCast(Opcode, C, DestTy),
ICmpInst::ICMP_EQ, NewContext);
}
// TODO: "%a = cast ... %b" where %b is NE/LT/GT a constant.
uint32_t W = VR.typeToWidth(DestTy);
Value *TheCI = IG.canonicalize(CI, Top);
ConstantRange CR = VR.rangeFromValue(Op, Top, W);
if (!CR.isFullSet()) {
switch (Opcode) {
default: break;
case Instruction::ZExt:
VR.applyRange(TheCI, CR.zeroExtend(W), Top, this);
break;
case Instruction::SExt:
VR.applyRange(TheCI, CR.signExtend(W), Top, this);
break;
case Instruction::Trunc: {
ConstantRange Result = CR.truncate(W);
if (!Result.isFullSet())
VR.applyRange(TheCI, Result, Top, this);
} break;
case Instruction::BitCast:
VR.applyRange(TheCI, CR, Top, this);
break;
// TODO: other casts?
}
}
} else if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(I)) {
for (GetElementPtrInst::op_iterator OI = GEPI->idx_begin(),
OE = GEPI->idx_end(); OI != OE; ++OI) {
@ -1912,6 +1966,10 @@ namespace {
VRP->add(V, C, Pred, VRP->TopInst);
}
void ValueRanges::markBlock(VRPSolver *VRP) {
VRP->UB.mark(VRP->TopBB);
}
#ifndef NDEBUG
bool ValueRanges::isCanonical(Value *V, ETNode *Subtree, VRPSolver *VRP) {
return V == VRP->IG.canonicalize(V, Subtree);