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Feedback from Hans on r213815. No functionaility change. 

llvm-svn: 213895
This commit is contained in:
Manman Ren 2014-07-24 21:13:20 +00:00
parent e34a71aa91
commit 4d189fb9a6
1 changed files with 11 additions and 10 deletions
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21
llvm/lib/Transforms/Utils/SimplifyCFG.cpp
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@ -3477,7 +3477,7 @@ namespace {
/// BuildLookup - Build instructions with Builder to retrieve the value at
/// the position given by Index in the lookup table.
Value *BuildLookup(Value *Index, uint64_t TableSize, IRBuilder<> &Builder);
Value *BuildLookup(Value *Index, IRBuilder<> &Builder);
/// WouldFitInRegister - Return true if a table with TableSize elements of
/// type ElementType would fit in a target-legal register.
@ -3598,8 +3598,7 @@ SwitchLookupTable::SwitchLookupTable(Module &M,
Kind = ArrayKind;
}
Value *SwitchLookupTable::BuildLookup(Value *Index, uint64_t TableSize,
IRBuilder<> &Builder) {
Value *SwitchLookupTable::BuildLookup(Value *Index, IRBuilder<> &Builder) {
switch (Kind) {
case SingleValueKind:
return SingleValue;
@ -3626,12 +3625,14 @@ Value *SwitchLookupTable::BuildLookup(Value *Index, uint64_t TableSize,
}
case ArrayKind: {
// Make sure the table index will not overflow when treated as signed.
if (IntegerType *IT = dyn_cast<IntegerType>(Index->getType()))
if (TableSize > (1ULL << (IT->getBitWidth() - 1)))
Index = Builder.CreateZExt(Index,
IntegerType::get(IT->getContext(),
IT->getBitWidth() + 1),
"switch.tableidx.zext");
IntegerType *IT = cast<IntegerType>(Index->getType());
uint64_t TableSize = Array->getInitializer()->getType()
->getArrayNumElements();
if (TableSize > (1ULL << (IT->getBitWidth() - 1)))
Index = Builder.CreateZExt(Index,
IntegerType::get(IT->getContext(),
IT->getBitWidth() + 1),
"switch.tableidx.zext");
Value *GEPIndices[] = { Builder.getInt32(0), Index };
Value *GEP = Builder.CreateInBoundsGEP(Array, GEPIndices,
@ -3887,7 +3888,7 @@ static bool SwitchToLookupTable(SwitchInst *SI,
SwitchLookupTable Table(Mod, TableSize, MinCaseVal, ResultLists[PHI],
DV, DL);
Value *Result = Table.BuildLookup(TableIndex, TableSize, Builder);
Value *Result = Table.BuildLookup(TableIndex, Builder);
// If the result is used to return immediately from the function, we want to
// do that right here.