diff options
Diffstat (limited to 'llvm_mode/split-switches-pass.so.cc')
| -rw-r--r-- | llvm_mode/split-switches-pass.so.cc | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/llvm_mode/split-switches-pass.so.cc b/llvm_mode/split-switches-pass.so.cc index 45847f88..4c28f34c 100644 --- a/llvm_mode/split-switches-pass.so.cc +++ b/llvm_mode/split-switches-pass.so.cc @@ -87,6 +87,7 @@ BasicBlock* SplitSwitchesTransform::switchConvert(CaseVector Cases, std::vector< std::vector<uint8_t> setSizes; std::vector<std::set<uint8_t>> byteSets(BytesInValue, std::set<uint8_t>()); + assert(ValTypeBitWidth >= 8 && ValTypeBitWidth <= 64); /* for each of the possible cases we iterate over all bytes of the values * build a set of possible values at each byte position in byteSets */ @@ -98,6 +99,8 @@ BasicBlock* SplitSwitchesTransform::switchConvert(CaseVector Cases, std::vector< } } + /* find the index of the first byte position that was not yet checked. then + * save the number of possible values at that byte position */ unsigned smallestIndex = 0; unsigned smallestSize = 257; for(unsigned i = 0; i < byteSets.size(); i++) { @@ -235,9 +238,13 @@ bool SplitSwitchesTransform::splitSwitches(Module &M) { /* this is the value we are switching on */ Value *Val = SI->getCondition(); BasicBlock* Default = SI->getDefaultDest(); + unsigned bitw = Val->getType()->getIntegerBitWidth(); - /* If there is only the default destination, don't bother with the code below. */ - if (!SI->getNumCases()) { + errs() << "switch: " << SI->getNumCases() << " cases " << bitw << " bit\n"; + + /* If there is only the default destination or the condition checks 8 bit or less, don't bother with the code below. */ + if (!SI->getNumCases() || bitw <= 8) { + errs() << "skip trivial switch..\n"; continue; } |