diff options
Diffstat (limited to 'contrib/llvm/lib/CodeGen/SelectionDAG')
| -rw-r--r-- | contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp index 7ed46a6..095b400 100644 --- a/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp +++ b/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp @@ -2034,14 +2034,17 @@ bool SelectionDAGBuilder::handleJTSwitchCase(CaseRec &CR, return false; APInt Range = ComputeRange(First, Last); - double Density = TSize.roundToDouble() / Range.roundToDouble(); - if (Density < 0.4) + // The density is TSize / Range. Require at least 40%. + // It should not be possible for IntTSize to saturate for sane code, but make + // sure we handle Range saturation correctly. + uint64_t IntRange = Range.getLimitedValue(UINT64_MAX/10); + uint64_t IntTSize = TSize.getLimitedValue(UINT64_MAX/10); + if (IntTSize * 10 < IntRange * 4) return false; DEBUG(dbgs() << "Lowering jump table\n" << "First entry: " << First << ". Last entry: " << Last << '\n' - << "Range: " << Range - << ". Size: " << TSize << ". Density: " << Density << "\n\n"); + << "Range: " << Range << ". Size: " << TSize << ".\n\n"); // Get the MachineFunction which holds the current MBB. This is used when // inserting any additional MBBs necessary to represent the switch. |
