diff options
| -rw-r--r-- | include/llvm/CodeGen/Passes.h | 4 | ||||
| -rw-r--r-- | lib/CodeGen/LiveIntervalAnalysis.cpp | 1 | ||||
| -rw-r--r-- | lib/CodeGen/Passes.cpp | 9 |
3 files changed, 14 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/Passes.h b/include/llvm/CodeGen/Passes.h index 0cddff8d9d..07b3b45873 100644 --- a/include/llvm/CodeGen/Passes.h +++ b/include/llvm/CodeGen/Passes.h @@ -315,6 +315,10 @@ namespace llvm { /// This pass is still in development extern char &StrongPHIEliminationID; + /// LiveIntervals - This analysis keeps track of the live ranges of virtual + /// and physical registers. + extern char &LiveIntervalsID; + /// LiveStacks pass. An analysis keeping track of the liveness of stack slots. extern char &LiveStacksID; diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index b488e8f077..d0f8ae1af3 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -45,6 +45,7 @@ NewLiveIntervals("new-live-intervals", cl::Hidden, cl::desc("Use new algorithm forcomputing live intervals")); char LiveIntervals::ID = 0; +char &llvm::LiveIntervalsID = LiveIntervals::ID; INITIALIZE_PASS_BEGIN(LiveIntervals, "liveintervals", "Live Interval Analysis", false, false) INITIALIZE_AG_DEPENDENCY(AliasAnalysis) diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp index 69d6d00091..cfa3eecf02 100644 --- a/lib/CodeGen/Passes.cpp +++ b/lib/CodeGen/Passes.cpp @@ -88,6 +88,10 @@ PrintMachineInstrs("print-machineinstrs", cl::ValueOptional, cl::desc("Print machine instrs"), cl::value_desc("pass-name"), cl::init("option-unspecified")); +// Experimental option to run live inteerval analysis early. +static cl::opt<bool> EarlyLiveIntervals("early-live-intervals", cl::Hidden, + cl::desc("Run live interval analysis earlier in the pipeline")); + /// Allow standard passes to be disabled by command line options. This supports /// simple binary flags that either suppress the pass or do nothing. /// i.e. -disable-mypass=false has no effect. @@ -648,6 +652,11 @@ void TargetPassConfig::addOptimizedRegAlloc(FunctionPass *RegAllocPass) { addPass(&MachineLoopInfoID); addPass(&PHIEliminationID); } + + // Eventually, we want to run LiveIntervals before PHI elimination. + if (EarlyLiveIntervals) + addPass(&LiveIntervalsID); + addPass(&TwoAddressInstructionPassID); if (EnableStrongPHIElim) |