From 8396e130427999c57422e52af3913eb8182847e5 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Tue, 2 Apr 2013 17:49:51 +0000 Subject: Count processor resources individually in MachineTraceMetrics. The new instruction scheduling models provide information about the number of cycles consumed on each processor resource. This makes it possible to estimate ILP more accurately than simply counting instructions / issue width. The functions getResourceDepth() and getResourceLength() now identify the limiting processor resource, and return a cycle count based on that. This gives more precise resource information, particularly in traces that use one resource a lot more than others. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178553 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/CodeGen/MachineTraceMetrics.h | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'include/llvm/CodeGen/MachineTraceMetrics.h') diff --git a/include/llvm/CodeGen/MachineTraceMetrics.h b/include/llvm/CodeGen/MachineTraceMetrics.h index eaaa70a..2775a04 100644 --- a/include/llvm/CodeGen/MachineTraceMetrics.h +++ b/include/llvm/CodeGen/MachineTraceMetrics.h @@ -107,6 +107,13 @@ public: /// Get the fixed resource information about MBB. Compute it on demand. const FixedBlockInfo *getResources(const MachineBasicBlock*); + /// Get the scaled number of cycles used per processor resource in MBB. + /// This is an array with SchedModel.getNumProcResourceKinds() entries. + /// The getResources() function above must have been called first. + /// + /// These numbers have already been scaled by SchedModel.getResourceFactor(). + ArrayRef getProcResourceCycles(unsigned MBBNum) const; + /// A virtual register or regunit required by a basic block or its trace /// successors. struct LiveInReg { @@ -284,6 +291,8 @@ public: class Ensemble { SmallVector BlockInfo; DenseMap Cycles; + SmallVector ProcResourceDepths; + SmallVector ProcResourceHeights; friend class Trace; void computeTrace(const MachineBasicBlock*); @@ -303,6 +312,8 @@ public: const MachineLoop *getLoopFor(const MachineBasicBlock*) const; const TraceBlockInfo *getDepthResources(const MachineBasicBlock*) const; const TraceBlockInfo *getHeightResources(const MachineBasicBlock*) const; + ArrayRef getProcResourceDepths(unsigned MBBNum) const; + ArrayRef getProcResourceHeights(unsigned MBBNum) const; public: virtual ~Ensemble(); @@ -343,8 +354,22 @@ private: // One entry per basic block, indexed by block number. SmallVector BlockInfo; + // Cycles consumed on each processor resource per block. + // The number of processor resource kinds is constant for a given subtarget, + // but it is not known at compile time. The number of cycles consumed by + // block B on processor resource R is at ProcResourceCycles[B*Kinds + R] + // where Kinds = SchedModel.getNumProcResourceKinds(). + SmallVector ProcResourceCycles; + // One ensemble per strategy. Ensemble* Ensembles[TS_NumStrategies]; + + // Convert scaled resource usage to a cycle count that can be compared with + // latencies. + unsigned getCycles(unsigned Scaled) { + unsigned Factor = SchedModel.getLatencyFactor(); + return (Scaled + Factor - 1) / Factor; + } }; inline raw_ostream &operator<<(raw_ostream &OS, -- cgit v1.1