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| author | Andrew Trick <atrick@apple.com> | 2013-08-23 17:48:39 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2013-08-23 17:48:39 +0000 |
| commit | 99093638a024fc23609a323677e67bb1dc63ebe7 (patch) | |
| tree | 6f4e93095b6575d99c4eb9c6e2a9a1d53b8e3b2a /lib/CodeGen/ScheduleDAGInstrs.cpp | |
| parent | c7a8d3e31d3f2fd9be02cad832131b425930fa09 (diff) | |
| download | llvm-99093638a024fc23609a323677e67bb1dc63ebe7.tar.gz llvm-99093638a024fc23609a323677e67bb1dc63ebe7.tar.bz2 llvm-99093638a024fc23609a323677e67bb1dc63ebe7.tar.xz | |
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
Diffstat (limited to 'lib/CodeGen/ScheduleDAGInstrs.cpp')
| -rw-r--r-- | lib/CodeGen/ScheduleDAGInstrs.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
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. |