mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-20 11:29:24 +00:00
Implement InstCombine/vec_shuffle.ll:test[12]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27571 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
7205684fa5
commit
a844fc4cb0
@ -138,6 +138,7 @@ namespace {
|
||||
Instruction *visitBranchInst(BranchInst &BI);
|
||||
Instruction *visitSwitchInst(SwitchInst &SI);
|
||||
Instruction *visitExtractElementInst(ExtractElementInst &EI);
|
||||
Instruction *visitShuffleVectorInst(ShuffleVectorInst &SVI);
|
||||
|
||||
// visitInstruction - Specify what to return for unhandled instructions...
|
||||
Instruction *visitInstruction(Instruction &I) { return 0; }
|
||||
@ -6876,6 +6877,67 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
Instruction *InstCombiner::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
|
||||
Value *LHS = SVI.getOperand(0);
|
||||
Value *RHS = SVI.getOperand(1);
|
||||
Constant *Mask = cast<Constant>(SVI.getOperand(2));
|
||||
|
||||
bool MadeChange = false;
|
||||
|
||||
if (isa<UndefValue>(Mask))
|
||||
return ReplaceInstUsesWith(SVI, UndefValue::get(SVI.getType()));
|
||||
|
||||
// Canonicalize shuffle(x,x) -> shuffle(x,undef)
|
||||
if (LHS == RHS) {
|
||||
if (isa<UndefValue>(LHS)) {
|
||||
// shuffle(undef,undef,mask) -> undef.
|
||||
return ReplaceInstUsesWith(SVI, LHS);
|
||||
}
|
||||
|
||||
if (!isa<ConstantAggregateZero>(Mask)) {
|
||||
// Remap any references to RHS to use LHS.
|
||||
ConstantPacked *CP = cast<ConstantPacked>(Mask);
|
||||
std::vector<Constant*> Elts;
|
||||
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
|
||||
Elts.push_back(CP->getOperand(i));
|
||||
if (isa<UndefValue>(CP->getOperand(i)))
|
||||
continue;
|
||||
unsigned MV = cast<ConstantInt>(CP->getOperand(i))->getRawValue();
|
||||
if (MV >= e)
|
||||
Elts.back() = ConstantUInt::get(Type::UIntTy, MV & (e-1));
|
||||
}
|
||||
Mask = ConstantPacked::get(Elts);
|
||||
}
|
||||
SVI.setOperand(1, UndefValue::get(RHS->getType()));
|
||||
SVI.setOperand(2, Mask);
|
||||
MadeChange = true;
|
||||
}
|
||||
|
||||
if (ConstantPacked *CP = dyn_cast<ConstantPacked>(Mask)) {
|
||||
bool isLHSID = true, isRHSID = true;
|
||||
|
||||
// Analyze the shuffle.
|
||||
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
|
||||
if (isa<UndefValue>(CP->getOperand(i)))
|
||||
continue;
|
||||
unsigned MV = cast<ConstantInt>(CP->getOperand(i))->getRawValue();
|
||||
|
||||
// Is this an identity shuffle of the LHS value?
|
||||
isLHSID &= (MV == i);
|
||||
|
||||
// Is this an identity shuffle of the RHS value?
|
||||
isRHSID &= (MV-e == i);
|
||||
}
|
||||
|
||||
// Eliminate identity shuffles.
|
||||
if (isLHSID) return ReplaceInstUsesWith(SVI, LHS);
|
||||
if (isRHSID) return ReplaceInstUsesWith(SVI, RHS);
|
||||
}
|
||||
|
||||
return MadeChange ? &SVI : 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
void InstCombiner::removeFromWorkList(Instruction *I) {
|
||||
WorkList.erase(std::remove(WorkList.begin(), WorkList.end(), I),
|
||||
|
Loading…
Reference in New Issue
Block a user