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[NFC][ARM][ParallelDSP] Cleanup isNarrowSequence 

Remove unused logic.

llvm-svn: 367099
This commit is contained in:
Sam Parker 2019-07-26 10:57:42 +00:00
parent a424a1f351
commit 7440065bd8
1 changed files with 5 additions and 26 deletions
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31
llvm/lib/Target/ARM/ARMParallelDSP.cpp
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@ -335,38 +335,17 @@ bool ARMParallelDSP::AreSequentialLoads(LoadInst *Ld0, LoadInst *Ld1,
// why we check that types are equal to MaxBitWidth, and not <= MaxBitWidth.
template<unsigned MaxBitWidth>
bool ARMParallelDSP::IsNarrowSequence(Value *V, ValueList &VL) {
ConstantInt *CInt;
if (match(V, m_ConstantInt(CInt))) {
// TODO: if a constant is used, it needs to fit within the bit width.
return false;
}
auto *I = dyn_cast<Instruction>(V);
if (!I)
return false;
Value *Val, *LHS, *RHS;
if (match(V, m_Trunc(m_Value(Val)))) {
if (cast<TruncInst>(I)->getDestTy()->getIntegerBitWidth() == MaxBitWidth)
return IsNarrowSequence<MaxBitWidth>(Val, VL);
} else if (match(V, m_Add(m_Value(LHS), m_Value(RHS)))) {
// TODO: we need to implement sadd16/sadd8 for this, which enables to
// also do the rewrite for smlad8.ll, but it is unsupported for now.
return false;
} else if (match(V, m_ZExtOrSExt(m_Value(Val)))) {
if (cast<CastInst>(I)->getSrcTy()->getIntegerBitWidth() != MaxBitWidth)
if (auto *SExt = dyn_cast<SExtInst>(V)) {
if (SExt->getSrcTy()->getIntegerBitWidth() != MaxBitWidth)
return false;
if (match(Val, m_Load(m_Value()))) {
auto *Ld = cast<LoadInst>(Val);
if (auto *Ld = dyn_cast<LoadInst>(SExt->getOperand(0))) {
// Check that these load could be paired.
if (!LoadPairs.count(Ld) && !OffsetLoads.count(Ld))
return false;
VL.push_back(Val);
VL.push_back(I);
VL.push_back(Ld);
VL.push_back(SExt);
return true;
}
}