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[SDag switch lowering] Simplify code a bit. No functional change intended.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239056 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2015-06-04 17:07:59 +00:00
parent 35cc03a1ea
commit b0ed8b72ef
1 changed files with 9 additions and 10 deletions
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19
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -7614,8 +7614,7 @@ bool SelectionDAGBuilder::buildBitTests(CaseClusterVector &Clusters,
const int BitWidth =
DAG.getTargetLoweringInfo().getPointerTy().getSizeInBits();
uint64_t Range = (High - Low).getLimitedValue(UINT64_MAX - 1) + 1;
assert(Range <= (uint64_t)BitWidth && "Case range must fit in bit mask!");
assert(rangeFitsInWord(Low, High) && "Case range must fit in bit mask!");
if (Low.isNonNegative() && High.slt(BitWidth)) {
// Optimize the case where all the case values fit in a
@ -7643,10 +7642,9 @@ bool SelectionDAGBuilder::buildBitTests(CaseClusterVector &Clusters,
// Update Mask, Bits and ExtraWeight.
uint64_t Lo = (Clusters[i].Low->getValue() - LowBound).getZExtValue();
uint64_t Hi = (Clusters[i].High->getValue() - LowBound).getZExtValue();
for (uint64_t j = Lo; j <= Hi; ++j) {
CB->Mask |= 1ULL << j;
CB->Bits++;
}
assert(Hi >= Lo && Hi < 64 && "Invalid bit case!");
CB->Mask |= (-1ULL >> (63 - (Hi - Lo))) << Lo;
CB->Bits += Hi - Lo + 1;
CB->ExtraWeight += Clusters[i].Weight;
TotalWeight += Clusters[i].Weight;
assert(TotalWeight >= Clusters[i].Weight && "Weight overflow!");
@ -7761,8 +7759,10 @@ void SelectionDAGBuilder::findBitTestClusters(CaseClusterVector &Clusters,
if (buildBitTests(Clusters, First, Last, SI, BitTestCluster)) {
Clusters[DstIndex++] = BitTestCluster;
} else {
for (unsigned I = First; I <= Last; ++I)
std::memmove(&Clusters[DstIndex++], &Clusters[I], sizeof(Clusters[I]));
size_t NumClusters = Last - First + 1;
std::memmove(&Clusters[DstIndex], &Clusters[First],
sizeof(Clusters[0]) * NumClusters);
DstIndex += NumClusters;
}
}
Clusters.resize(DstIndex);
@ -7798,8 +7798,7 @@ void SelectionDAGBuilder::lowerWorkItem(SwitchWorkListItem W, Value *Cond,
const APInt &BigValue = Big.Low->getValue();
// Check that there is only one bit different.
if (BigValue.countPopulation() == SmallValue.countPopulation() + 1 &&
(SmallValue | BigValue) == BigValue) {
if ((BigValue ^ SmallValue).isPowerOf2()) {
// Isolate the common bit.
APInt CommonBit = BigValue & ~SmallValue;
assert((SmallValue | CommonBit) == BigValue &&