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Add User::growHungoffUses and use it to grow the hung off uses. NFC.

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PhiNode, SwitchInst, LandingPad and IndirectBr all had virtually identical
logic for growing the hung off uses.
Move it to User so that they can all call a single shared implementation.

Their destructors were all empty after this change and were deleted.  They all
have virtual clone_impl methods which can be used as vtable anchors.

Reviewed by Duncan Exon Smith.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239492 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2015-06-10 22:38:41 +00:00
parent 0fa7dc6b36
commit 33102d2faa
3 changed files with 36 additions and 30 deletions
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34
lib/IR/Instructions.cpp
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@@ -128,16 +128,8 @@ void PHINode::growOperands() {
unsigned NumOps = e + e / 2;
if (NumOps < 2) NumOps = 2; // 2 op PHI nodes are VERY common.
Use *OldOps = op_begin();
BasicBlock **OldBlocks = block_begin();
ReservedSpace = NumOps;
OperandList = allocHungoffUses(ReservedSpace);
std::copy(OldOps, OldOps + e, op_begin());
std::copy(OldBlocks, OldBlocks + e, block_begin());
Use::zap(OldOps, OldOps + e, true);
growHungoffUses(ReservedSpace, /* IsPhi */ true);
}
/// hasConstantValue - If the specified PHI node always merges together the same
@@ -218,14 +210,7 @@ void LandingPadInst::growOperands(unsigned Size) {
unsigned e = getNumOperands();
if (ReservedSpace >= e + Size) return;
ReservedSpace = (e + Size / 2) * 2;
Use *NewOps = allocHungoffUses(ReservedSpace);
Use *OldOps = OperandList;
for (unsigned i = 0; i != e; ++i)
NewOps[i] = OldOps[i];
OperandList = NewOps;
Use::zap(OldOps, OldOps + e, true);
growHungoffUses(ReservedSpace);
}
void LandingPadInst::addClause(Constant *Val) {
@@ -3363,13 +3348,7 @@ void SwitchInst::growOperands() {
unsigned NumOps = e*3;
ReservedSpace = NumOps;
Use *NewOps = allocHungoffUses(NumOps);
Use *OldOps = OperandList;
for (unsigned i = 0; i != e; ++i) {
NewOps[i] = OldOps[i];
}
OperandList = NewOps;
Use::zap(OldOps, OldOps + e, true);
growHungoffUses(ReservedSpace);
}
@@ -3406,12 +3385,7 @@ void IndirectBrInst::growOperands() {
unsigned NumOps = e*2;
ReservedSpace = NumOps;
Use *NewOps = allocHungoffUses(NumOps);
Use *OldOps = OperandList;
for (unsigned i = 0; i != e; ++i)
NewOps[i] = OldOps[i];
OperandList = NewOps;
Use::zap(OldOps, OldOps + e, true);
growHungoffUses(ReservedSpace);
}
IndirectBrInst::IndirectBrInst(Value *Address, unsigned NumCases,