diff options
Diffstat (limited to 'llvm/lib/CodeGen/LiveIntervalAnalysis.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/LiveIntervalAnalysis.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp index 5df37da5391..e64652dedfd 100644 --- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -9,7 +9,8 @@ // // This file implements the LiveInterval analysis pass which is used // by the Linear Scan Register allocator. This pass linearizes the -// basic blocks of the function in DFS order and computes live intervals for +// basic blocks of the function in DFS order and uses the +// LiveVariables pass to conservatively compute live intervals for // each virtual and physical register. // //===----------------------------------------------------------------------===// @@ -47,6 +48,7 @@ char &llvm::LiveIntervalsID = LiveIntervals::ID; INITIALIZE_PASS_BEGIN(LiveIntervals, "liveintervals", "Live Interval Analysis", false, false) INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass) +INITIALIZE_PASS_DEPENDENCY(LiveVariables) INITIALIZE_PASS_DEPENDENCY(MachineDominatorTree) INITIALIZE_PASS_DEPENDENCY(SlotIndexes) INITIALIZE_PASS_END(LiveIntervals, "liveintervals", @@ -75,6 +77,10 @@ void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesCFG(); AU.addRequired<AAResultsWrapperPass>(); AU.addPreserved<AAResultsWrapperPass>(); + // LiveVariables isn't really required by this analysis, it is only required + // here to make sure it is live during TwoAddressInstructionPass and + // PHIElimination. This is temporary. + AU.addRequired<LiveVariables>(); AU.addPreserved<LiveVariables>(); AU.addPreservedID(MachineLoopInfoID); AU.addRequiredTransitiveID(MachineDominatorsID); |
