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implement the struct version of the array speedup, speeding up the

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testcase a bit more from 1:48 -> 1.40.

llvm-svn: 23619
This commit is contained in:
Chris Lattner 2005-10-04 01:17:50 +00:00
parent 27464c8061
commit 5d68585bb1
1 changed files with 49 additions and 9 deletions
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58
lib/VMCore/Constants.cpp
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@ -889,8 +889,9 @@ namespace llvm {
};
}
static ValueMap<std::vector<Constant*>, StructType,
ConstantStruct> StructConstants;
typedef ValueMap<std::vector<Constant*>, StructType,
ConstantStruct> StructConstantsTy;
static StructConstantsTy StructConstants;
static std::vector<Constant*> getValType(ConstantStruct *CS) {
std::vector<Constant*> Elements;
@ -1346,6 +1347,7 @@ const char *ConstantExpr::getOpcodeName() const {
void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
Constant *ToC = cast<Constant>(To);
std::pair<ArrayConstantsTy::MapKey, ConstantArray*> Lookup;
Lookup.first.first = getType();
@ -1353,10 +1355,12 @@ void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
std::vector<Constant*> &Values = Lookup.first.second;
Values.reserve(getNumOperands()); // Build replacement array.
bool isAllZeros = false; // Does this turn into an all-zeros array?
// Fill values with the modified operands of the constant array. Also,
// compute whether this turns into an all-zeros array.
bool isAllZeros = ToC->isNullValue();
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
Constant *Val = getOperand(i);
if (Val == From) Val = cast<Constant>(To);
if (Val == From) Val = ToC;
Values.push_back(Val);
if (isAllZeros) isAllZeros = Val->isNullValue();
}
@ -1384,7 +1388,7 @@ void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
// Update to the new values.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (getOperand(i) == From)
setOperand(i, cast<Constant>(To));
setOperand(i, ToC);
return;
}
}
@ -1405,16 +1409,52 @@ void ConstantArray::replaceUsesOfWithOnConstant(Value *From, Value *To,
void ConstantStruct::replaceUsesOfWithOnConstant(Value *From, Value *To,
bool DisableChecking) {
assert(isa<Constant>(To) && "Cannot make Constant refer to non-constant!");
Constant *ToC = cast<Constant>(To);
std::pair<StructConstantsTy::MapKey, ConstantStruct*> Lookup;
Lookup.first.first = getType();
Lookup.second = this;
std::vector<Constant*> &Values = Lookup.first.second;
Values.reserve(getNumOperands()); // Build replacement struct.
std::vector<Constant*> Values;
Values.reserve(getNumOperands()); // Build replacement array...
// Fill values with the modified operands of the constant struct. Also,
// compute whether this turns into an all-zeros struct.
bool isAllZeros = ToC->isNullValue();
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
Constant *Val = getOperand(i);
if (Val == From) Val = cast<Constant>(To);
if (Val == From) Val = ToC;
Values.push_back(Val);
if (isAllZeros) isAllZeros = Val->isNullValue();
}
Constant *Replacement = 0;
if (isAllZeros) {
Replacement = ConstantAggregateZero::get(getType());
} else {
// Check to see if we have this array type already.
bool Exists;
StructConstantsTy::MapIterator I =
StructConstants.InsertOrGetItem(Lookup, Exists);
if (Exists) {
Replacement = I->second;
} else {
// Okay, the new shape doesn't exist in the system yet. Instead of
// creating a new constant struct, inserting it, replaceallusesof'ing the
// old with the new, then deleting the old... just update the current one
// in place!
if (I != StructConstants.map_end() && I->second == this)
++I; // Do not invalidate iterator!
StructConstants.remove(this); // Remove old shape from the map.
// Update to the new values.
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (getOperand(i) == From)
setOperand(i, ToC);
return;
}
}
Constant *Replacement = ConstantStruct::get(getType(), Values);
assert(Replacement != this && "I didn't contain From!");
// Everyone using this now uses the replacement...