diff options
| -rw-r--r-- | lib/Target/PowerPC/PPCISelLowering.cpp | 7 | ||||
| -rw-r--r-- | lib/Target/PowerPC/PPCSubtarget.cpp | 39 | ||||
| -rw-r--r-- | lib/Target/PowerPC/PPCSubtarget.h | 8 |
3 files changed, 52 insertions, 2 deletions
diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index 244e00d438..d3410749d1 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -556,7 +556,10 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM) setInsertFencesForAtomic(true); - setSchedulingPreference(Sched::Hybrid); + if (Subtarget->enableMachineScheduler()) + setSchedulingPreference(Sched::Source); + else + setSchedulingPreference(Sched::Hybrid); computeRegisterProperties(); @@ -7853,7 +7856,7 @@ bool PPCTargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const { } Sched::Preference PPCTargetLowering::getSchedulingPreference(SDNode *N) const { - if (DisableILPPref) + if (DisableILPPref || PPCSubTarget.enableMachineScheduler()) return TargetLowering::getSchedulingPreference(N); return Sched::ILP; diff --git a/lib/Target/PowerPC/PPCSubtarget.cpp b/lib/Target/PowerPC/PPCSubtarget.cpp index f975f5539c..ace37c1f22 100644 --- a/lib/Target/PowerPC/PPCSubtarget.cpp +++ b/lib/Target/PowerPC/PPCSubtarget.cpp @@ -15,6 +15,7 @@ #include "PPC.h" #include "PPCRegisterInfo.h" #include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineScheduler.h" #include "llvm/IR/Attributes.h" #include "llvm/IR/GlobalValue.h" #include "llvm/IR/Function.h" @@ -186,3 +187,41 @@ bool PPCSubtarget::enablePostRAScheduler( return OptLevel >= CodeGenOpt::Default; } +// Embedded cores need aggressive scheduling. +static bool needsAggressiveScheduling(unsigned Directive) { + switch (Directive) { + default: return false; + case PPC::DIR_440: + case PPC::DIR_A2: + case PPC::DIR_E500mc: + case PPC::DIR_E5500: + return true; + } +} + +bool PPCSubtarget::enableMachineScheduler() const { + // Enable MI scheduling for the embedded cores. + // FIXME: Enable this for all cores (some additional modeling + // may be necessary). + return needsAggressiveScheduling(DarwinDirective); +} + +void PPCSubtarget::overrideSchedPolicy(MachineSchedPolicy &Policy, + MachineInstr *begin, + MachineInstr *end, + unsigned NumRegionInstrs) const { + if (needsAggressiveScheduling(DarwinDirective)) { + Policy.OnlyTopDown = false; + Policy.OnlyBottomUp = false; + } + + // Spilling is generally expensive on all PPC cores, so always enable + // register-pressure tracking. + Policy.ShouldTrackPressure = true; +} + +bool PPCSubtarget::useAA() const { + // Use AA during code generation for the embedded cores. + return needsAggressiveScheduling(DarwinDirective); +} + diff --git a/lib/Target/PowerPC/PPCSubtarget.h b/lib/Target/PowerPC/PPCSubtarget.h index a933bf69bb..179ceb5e36 100644 --- a/lib/Target/PowerPC/PPCSubtarget.h +++ b/lib/Target/PowerPC/PPCSubtarget.h @@ -207,6 +207,14 @@ public: bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, TargetSubtargetInfo::AntiDepBreakMode& Mode, RegClassVector& CriticalPathRCs) const; + + // Scheduling customization. + bool enableMachineScheduler() const; + void overrideSchedPolicy(MachineSchedPolicy &Policy, + MachineInstr *begin, + MachineInstr *end, + unsigned NumRegionInstrs) const; + bool useAA() const; }; } // End llvm namespace |