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author | Andrew Trick <atrick@apple.com> | 2012-02-10 04:10:36 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2012-02-10 04:10:36 +0000 |
commit | 8dd26253f54247e77e5accfdd70e7b4bf27b39c2 (patch) | |
tree | df14b7b3cec3b603bc5feb7070a05f00eb83d4a5 /lib/CodeGen/RegAllocFast.cpp | |
parent | 16f72dd68653bd4984363483cfc15ce91fa613d4 (diff) | |
download | llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.tar.gz llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.tar.bz2 llvm-8dd26253f54247e77e5accfdd70e7b4bf27b39c2.tar.xz |
RegAlloc superpass: includes phi elimination, coalescing, and scheduling.
Creates a configurable regalloc pipeline.
Ensure specific llc options do what they say and nothing more: -reglloc=... has no effect other than selecting the allocator pass itself. This patch introduces a new umbrella flag, "-optimize-regalloc", to enable/disable the optimizing regalloc "superpass". This allows for example testing coalscing and scheduling under -O0 or vice-versa.
When a CodeGen pass requires the MachineFunction to have a particular property, we need to explicitly define that property so it can be directly queried rather than naming a specific Pass. For example, to check for SSA, use MRI->isSSA, not addRequired<PHIElimination>.
CodeGen transformation passes are never "required" as an analysis
ProcessImplicitDefs does not require LiveVariables.
We have a plan to massively simplify some of the early passes within the regalloc superpass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150226 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/RegAllocFast.cpp')
-rw-r--r-- | lib/CodeGen/RegAllocFast.cpp | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp index a54785d66f..4724ca2f92 100644 --- a/lib/CodeGen/RegAllocFast.cpp +++ b/lib/CodeGen/RegAllocFast.cpp @@ -49,10 +49,7 @@ namespace { public: static char ID; RAFast() : MachineFunctionPass(ID), StackSlotForVirtReg(-1), - isBulkSpilling(false) { - initializePHIEliminationPass(*PassRegistry::getPassRegistry()); - initializeTwoAddressInstructionPassPass(*PassRegistry::getPassRegistry()); - } + isBulkSpilling(false) {} private: const TargetMachine *TM; MachineFunction *MF; @@ -137,8 +134,6 @@ namespace { virtual void getAnalysisUsage(AnalysisUsage &AU) const { AU.setPreservesCFG(); - AU.addRequiredID(PHIEliminationID); - AU.addRequiredID(TwoAddressInstructionPassID); MachineFunctionPass::getAnalysisUsage(AU); } @@ -1089,6 +1084,8 @@ bool RAFast::runOnMachineFunction(MachineFunction &Fn) { RegClassInfo.runOnMachineFunction(Fn); UsedInInstr.resize(TRI->getNumRegs()); + assert(!MRI->isSSA() && "regalloc requires leaving SSA"); + // initialize the virtual->physical register map to have a 'null' // mapping for all virtual registers StackSlotForVirtReg.resize(MRI->getNumVirtRegs()); |