From 8dd26253f54247e77e5accfdd70e7b4bf27b39c2 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Fri, 10 Feb 2012 04:10:36 +0000 Subject: 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. 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 --- lib/CodeGen/PHIElimination.cpp | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'lib/CodeGen/PHIElimination.cpp') diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index 556fb40656..0ed4c34bb1 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -92,11 +92,15 @@ STATISTIC(NumCriticalEdgesSplit, "Number of critical edges split"); STATISTIC(NumReused, "Number of reused lowered phis"); char PHIElimination::ID = 0; -INITIALIZE_PASS(PHIElimination, "phi-node-elimination", - "Eliminate PHI nodes for register allocation", false, false) - char& llvm::PHIEliminationID = PHIElimination::ID; +INITIALIZE_PASS_BEGIN(PHIElimination, "phi-node-elimination", + "Eliminate PHI nodes for register allocation", + false, false) +INITIALIZE_PASS_DEPENDENCY(LiveVariables) +INITIALIZE_PASS_END(PHIElimination, "phi-node-elimination", + "Eliminate PHI nodes for register allocation", false, false) + void PHIElimination::getAnalysisUsage(AnalysisUsage &AU) const { AU.addPreserved(); AU.addPreserved(); -- cgit v1.2.3