diff options
Diffstat (limited to 'llvm/lib/CodeGen/RegisterCoalescer.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/RegisterCoalescer.cpp | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp index 99f76936a180..f93a7f22c396 100644 --- a/llvm/lib/CodeGen/RegisterCoalescer.cpp +++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp @@ -79,9 +79,9 @@ static cl::opt<bool> EnableJoining("join-liveintervals", cl::desc("Coalesce copies (default=true)"), cl::init(true), cl::Hidden); -static cl::opt<bool> UseTerminalRule("terminal-rule", - cl::desc("Apply the terminal rule"), - cl::init(false), cl::Hidden); +static cl::opt<cl::boolOrDefault> + EnableTerminalRule("terminal-rule", cl::desc("Apply the terminal rule"), + cl::init(cl::BOU_UNSET), cl::Hidden); /// Temporary flag to test critical edge unsplitting. static cl::opt<bool> EnableJoinSplits( @@ -134,6 +134,7 @@ class RegisterCoalescer : private LiveRangeEdit::Delegate { SlotIndexes *SI = nullptr; const MachineLoopInfo *Loops = nullptr; RegisterClassInfo RegClassInfo; + bool UseTerminalRule = false; /// Position and VReg of a PHI instruction during coalescing. struct PHIValPos { @@ -4320,6 +4321,11 @@ bool RegisterCoalescer::run(MachineFunction &fn) { else JoinGlobalCopies = (EnableGlobalCopies == cl::BOU_TRUE); + if (EnableTerminalRule == cl::BOU_UNSET) + UseTerminalRule = STI.enableTerminalRule(); + else + UseTerminalRule = EnableTerminalRule == cl::BOU_TRUE; + // If there are PHIs tracked by debug-info, they will need updating during // coalescing. Build an index of those PHIs to ease updating. SlotIndexes *Slots = LIS->getSlotIndexes(); |