From 99093638a024fc23609a323677e67bb1dc63ebe7 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Fri, 23 Aug 2013 17:48:39 +0000 Subject: MI Sched: record local vreg uses. This will be used to compute the cyclic critical path and to update precomputed per-node pressure differences. In the longer term, it could also be used to speed up LiveInterval update by avoiding visiting all global vreg users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189118 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/ScheduleDAGInstrs.cpp | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'lib/CodeGen/ScheduleDAGInstrs.cpp') diff --git a/lib/CodeGen/ScheduleDAGInstrs.cpp b/lib/CodeGen/ScheduleDAGInstrs.cpp index b0245d5c3c..24714089da 100644 --- a/lib/CodeGen/ScheduleDAGInstrs.cpp +++ b/lib/CodeGen/ScheduleDAGInstrs.cpp @@ -405,6 +405,9 @@ void ScheduleDAGInstrs::addVRegUseDeps(SUnit *SU, unsigned OperIdx) { MachineInstr *MI = SU->getInstr(); unsigned Reg = MI->getOperand(OperIdx).getReg(); + // Record this local VReg use. + VRegUses.insert(VReg2SUnit(Reg, SU)); + // Lookup this operand's reaching definition. assert(LIS && "vreg dependencies requires LiveIntervals"); LiveRangeQuery LRQ(LIS->getInterval(Reg), LIS->getInstructionIndex(MI)); @@ -715,10 +718,9 @@ void ScheduleDAGInstrs::buildSchedGraph(AliasAnalysis *AA, Uses.setUniverse(TRI->getNumRegs()); assert(VRegDefs.empty() && "Only BuildSchedGraph may access VRegDefs"); - // FIXME: Allow SparseSet to reserve space for the creation of virtual - // registers during scheduling. Don't artificially inflate the Universe - // because we want to assert that vregs are not created during DAG building. + VRegUses.clear(); VRegDefs.setUniverse(MRI.getNumVirtRegs()); + VRegUses.setUniverse(MRI.getNumVirtRegs()); // Model data dependencies between instructions being scheduled and the // ExitSU. -- cgit v1.2.3