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LLVMContext: Store APInt/APFloat directly into the ConstantInt/FP DenseMaps.

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Required some APInt massaging to get proper empty/tombstone values. Apart
from making the code a bit simpler this also reduces the bucket size of
the ConstantInt map from 32 to 24 bytes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223478 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-12-05 17:03:01 +00:00
parent 3ad762170b
commit 472e9cc4bc
3 changed files with 26 additions and 57 deletions
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lib/IR/Constants.cpp
+9 -10
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@@ -555,18 +555,17 @@ Constant *ConstantInt::getFalse(Type *Ty) {
}
// Get a ConstantInt from an APInt. Note that the value stored in the DenseMap
// as the key, is a DenseMapAPIntKeyInfo::KeyTy which has provided the
// operator== and operator!= to ensure that the DenseMap doesn't attempt to
// compare APInt's of different widths, which would violate an APInt class
// invariant which generates an assertion.
// Get a ConstantInt from an APInt.
ConstantInt *ConstantInt::get(LLVMContext &Context, const APInt &V) {
// Get the corresponding integer type for the bit width of the value.
IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
// get an existing value or the insertion position
LLVMContextImpl *pImpl = Context.pImpl;
ConstantInt *&Slot = pImpl->IntConstants[DenseMapAPIntKeyInfo::KeyTy(V, ITy)];
if (!Slot) Slot = new ConstantInt(ITy, V);
ConstantInt *&Slot = pImpl->IntConstants[V];
if (!Slot) {
// Get the corresponding integer type for the bit width of the value.
IntegerType *ITy = IntegerType::get(Context, V.getBitWidth());
Slot = new ConstantInt(ITy, V);
}
assert(Slot->getType() == IntegerType::get(Context, V.getBitWidth()));
return Slot;
}
@@ -689,7 +688,7 @@ Constant *ConstantFP::getZeroValueForNegation(Type *Ty) {
ConstantFP* ConstantFP::get(LLVMContext &Context, const APFloat& V) {
LLVMContextImpl* pImpl = Context.pImpl;
ConstantFP *&Slot = pImpl->FPConstants[DenseMapAPFloatKeyInfo::KeyTy(V)];
ConstantFP *&Slot = pImpl->FPConstants[V];
if (!Slot) {
Type *Ty;