[llvm] Add bottle-neck analysis to JSON output. (PR #90056)
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Thu Apr 25 07:02:18 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-tools-llvm-mca
Author: Phil Camp (FlameTop)
<details>
<summary>Changes</summary>
This patch implements the bottle-neck analysis data in the JSON dump mode.
---
Full diff: https://github.com/llvm/llvm-project/pull/90056.diff
3 Files Affected:
- (added) llvm/test/tools/llvm-mca/JSON/X86/views-bottleneck.s (+166)
- (modified) llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp (+46)
- (modified) llvm/tools/llvm-mca/Views/BottleneckAnalysis.h (+2-1)
``````````diff
diff --git a/llvm/test/tools/llvm-mca/JSON/X86/views-bottleneck.s b/llvm/test/tools/llvm-mca/JSON/X86/views-bottleneck.s
new file mode 100644
index 00000000000000..2267e623b5e997
--- /dev/null
+++ b/llvm/test/tools/llvm-mca/JSON/X86/views-bottleneck.s
@@ -0,0 +1,166 @@
+# NOTE: Assertions have been autogenerated by utils/update_mca_test_checks.py
+# RUN: llvm-mca -mtriple=x86_64-unknown-unknown -mcpu=haswell --json --timeline-max-iterations=1 --timeline --all-stats --all-views < %s | FileCheck %s
+vaddps %xmm0, %xmm0, %xmm1
+vblendvps %xmm1, (%rdi), %xmm2, %xmm3
+
+# CHECK: {
+# CHECK-NEXT: "CodeRegions": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "BottleneckAnalysis": {
+# CHECK-NEXT: "DataDependencyCycles": 0,
+# CHECK-NEXT: "DependencyEdge": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "FromID": 1,
+# CHECK-NEXT: "ResourceOrRegID": 128,
+# CHECK-NEXT: "ToID": 3,
+# CHECK-NEXT: "Type": 3
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "FromID": 3,
+# CHECK-NEXT: "ResourceOrRegID": 128,
+# CHECK-NEXT: "ToID": 5,
+# CHECK-NEXT: "Type": 3
+# CHECK-NEXT: }
+# CHECK-NEXT: ],
+# CHECK-NEXT: "MemoryDependencyCycles": 0,
+# CHECK-NEXT: "PressureIncreaseCycles": 56,
+# CHECK-NEXT: "RegisterDependencyCycles": 0,
+# CHECK-NEXT: "ResourcePressure": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "HWPort5": 56
+# CHECK-NEXT: }
+# CHECK-NEXT: ],
+# CHECK-NEXT: "ResourcePressureCycles": 56,
+# CHECK-NEXT: "TotalCycles": 209
+# CHECK-NEXT: },
+# CHECK-NEXT: "DispatchStatistics": {
+# CHECK-NEXT: "GROUP": 0,
+# CHECK-NEXT: "LQ": 0,
+# CHECK-NEXT: "RAT": 0,
+# CHECK-NEXT: "RCU": 13,
+# CHECK-NEXT: "SCHEDQ": 0,
+# CHECK-NEXT: "SQ": 0,
+# CHECK-NEXT: "USH": 0
+# CHECK-NEXT: },
+# CHECK-NEXT: "InstructionInfoView": {
+# CHECK-NEXT: "InstructionList": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "Instruction": 0,
+# CHECK-NEXT: "Latency": 3,
+# CHECK-NEXT: "NumMicroOpcodes": 1,
+# CHECK-NEXT: "RThroughput": 1,
+# CHECK-NEXT: "hasUnmodeledSideEffects": false,
+# CHECK-NEXT: "mayLoad": false,
+# CHECK-NEXT: "mayStore": false
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "Instruction": 1,
+# CHECK-NEXT: "Latency": 8,
+# CHECK-NEXT: "NumMicroOpcodes": 3,
+# CHECK-NEXT: "RThroughput": 2,
+# CHECK-NEXT: "hasUnmodeledSideEffects": false,
+# CHECK-NEXT: "mayLoad": true,
+# CHECK-NEXT: "mayStore": false
+# CHECK-NEXT: }
+# CHECK-NEXT: ]
+# CHECK-NEXT: },
+# CHECK-NEXT: "Instructions": [
+# CHECK-NEXT: "vaddps\t%xmm0, %xmm0, %xmm1",
+# CHECK-NEXT: "vblendvps\t%xmm1, (%rdi), %xmm2, %xmm3"
+# CHECK-NEXT: ],
+# CHECK-NEXT: "Name": "",
+# CHECK-NEXT: "ResourcePressureView": {
+# CHECK-NEXT: "ResourcePressureInfo": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 0,
+# CHECK-NEXT: "ResourceIndex": 3,
+# CHECK-NEXT: "ResourceUsage": 1
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 1,
+# CHECK-NEXT: "ResourceIndex": 4,
+# CHECK-NEXT: "ResourceUsage": 0.5
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 1,
+# CHECK-NEXT: "ResourceIndex": 5,
+# CHECK-NEXT: "ResourceUsage": 0.5
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 1,
+# CHECK-NEXT: "ResourceIndex": 7,
+# CHECK-NEXT: "ResourceUsage": 2
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 2,
+# CHECK-NEXT: "ResourceIndex": 3,
+# CHECK-NEXT: "ResourceUsage": 1
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 2,
+# CHECK-NEXT: "ResourceIndex": 4,
+# CHECK-NEXT: "ResourceUsage": 0.5
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 2,
+# CHECK-NEXT: "ResourceIndex": 5,
+# CHECK-NEXT: "ResourceUsage": 0.5
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "InstructionIndex": 2,
+# CHECK-NEXT: "ResourceIndex": 7,
+# CHECK-NEXT: "ResourceUsage": 2
+# CHECK-NEXT: }
+# CHECK-NEXT: ]
+# CHECK-NEXT: },
+# CHECK-NEXT: "SummaryView": {
+# CHECK-NEXT: "BlockRThroughput": 2,
+# CHECK-NEXT: "DispatchWidth": 4,
+# CHECK-NEXT: "IPC": 0.9569377990430622,
+# CHECK-NEXT: "Instructions": 200,
+# CHECK-NEXT: "Iterations": 100,
+# CHECK-NEXT: "TotalCycles": 209,
+# CHECK-NEXT: "TotaluOps": 400,
+# CHECK-NEXT: "uOpsPerCycle": 1.9138755980861244
+# CHECK-NEXT: },
+# CHECK-NEXT: "TimelineView": {
+# CHECK-NEXT: "TimelineInfo": [
+# CHECK-NEXT: {
+# CHECK-NEXT: "CycleDispatched": 0,
+# CHECK-NEXT: "CycleExecuted": 4,
+# CHECK-NEXT: "CycleIssued": 1,
+# CHECK-NEXT: "CycleReady": 0,
+# CHECK-NEXT: "CycleRetired": 5
+# CHECK-NEXT: },
+# CHECK-NEXT: {
+# CHECK-NEXT: "CycleDispatched": 0,
+# CHECK-NEXT: "CycleExecuted": 9,
+# CHECK-NEXT: "CycleIssued": 1,
+# CHECK-NEXT: "CycleReady": 1,
+# CHECK-NEXT: "CycleRetired": 10
+# CHECK-NEXT: }
+# CHECK-NEXT: ]
+# CHECK-NEXT: }
+# CHECK-NEXT: }
+# CHECK-NEXT: ],
+# CHECK-NEXT: "SimulationParameters": {
+# CHECK-NEXT: "-march": "x86_64",
+# CHECK-NEXT: "-mcpu": "haswell",
+# CHECK-NEXT: "-mtriple": "x86_64-unknown-unknown"
+# CHECK-NEXT: },
+# CHECK-NEXT: "TargetInfo": {
+# CHECK-NEXT: "CPUName": "haswell",
+# CHECK-NEXT: "Resources": [
+# CHECK-NEXT: "HWDivider",
+# CHECK-NEXT: "HWFPDivider",
+# CHECK-NEXT: "HWPort0",
+# CHECK-NEXT: "HWPort1",
+# CHECK-NEXT: "HWPort2",
+# CHECK-NEXT: "HWPort3",
+# CHECK-NEXT: "HWPort4",
+# CHECK-NEXT: "HWPort5",
+# CHECK-NEXT: "HWPort6",
+# CHECK-NEXT: "HWPort7"
+# CHECK-NEXT: ]
+# CHECK-NEXT: }
+# CHECK-NEXT: }
diff --git a/llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp b/llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp
index 409a7010b80c8d..ece5b6709a2e4c 100644
--- a/llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp
+++ b/llvm/tools/llvm-mca/Views/BottleneckAnalysis.cpp
@@ -641,5 +641,51 @@ void BottleneckAnalysis::printView(raw_ostream &OS) const {
printCriticalSequence(OS);
}
+json::Value BottleneckAnalysis::toJSON() const {
+ if (!SeenStallCycles || !BPI.PressureIncreaseCycles) {
+ json::Object JO({{"PressureIncreaseCycles", 0}});
+ return JO;
+ }
+
+ json::Array CriticalSequence;
+ // get critical sequence
+ SmallVector<const DependencyEdge *, 16> Seq;
+ DG.getCriticalSequence(Seq);
+ if (!Seq.empty()) {
+ for (const DependencyEdge *&DE : Seq) {
+ json::Object DEJO({{"FromID", DE->FromIID},
+ {"ToID", DE->ToIID},
+ {"Type", static_cast<unsigned>(DE->Dep.Type)},
+ {"ResourceOrRegID", DE->Dep.ResourceOrRegID}});
+ CriticalSequence.push_back(std::move(DEJO));
+ }
+ }
+
+ json::Array ResourcePressure;
+ if (BPI.PressureIncreaseCycles) {
+ ArrayRef<unsigned> Distribution = Tracker.getResourcePressureDistribution();
+ const MCSchedModel &SM = getSubTargetInfo().getSchedModel();
+ for (unsigned I = 0, E = Distribution.size(); I < E; ++I) {
+ unsigned ReleaseAtCycles = Distribution[I];
+ if (ReleaseAtCycles) {
+ const MCProcResourceDesc &PRDesc = *SM.getProcResource(I);
+ json::Object RPJO({{PRDesc.Name, ReleaseAtCycles}});
+ ResourcePressure.push_back(std::move(RPJO));
+ }
+ }
+ }
+
+ json::Object JO({{"PressureIncreaseCycles", BPI.PressureIncreaseCycles},
+ {"ResourcePressureCycles", BPI.ResourcePressureCycles},
+ {"DataDependencyCycles", BPI.DataDependencyCycles},
+ {"RegisterDependencyCycles", BPI.RegisterDependencyCycles},
+ {"MemoryDependencyCycles", BPI.MemoryDependencyCycles},
+ {"TotalCycles", TotalCycles},
+ {"DependencyEdge", std::move(CriticalSequence)},
+ {"ResourcePressure", std::move(ResourcePressure)}});
+
+ return JO;
+}
+
} // namespace mca.
} // namespace llvm
diff --git a/llvm/tools/llvm-mca/Views/BottleneckAnalysis.h b/llvm/tools/llvm-mca/Views/BottleneckAnalysis.h
index e709b25c3f7680..529090cf543fc4 100644
--- a/llvm/tools/llvm-mca/Views/BottleneckAnalysis.h
+++ b/llvm/tools/llvm-mca/Views/BottleneckAnalysis.h
@@ -335,7 +335,8 @@ class BottleneckAnalysis : public InstructionView {
void printView(raw_ostream &OS) const override;
StringRef getNameAsString() const override { return "BottleneckAnalysis"; }
- bool isSerializable() const override { return false; }
+ bool isSerializable() const override { return true; }
+ json::Value toJSON() const override;
#ifndef NDEBUG
void dump(raw_ostream &OS, MCInstPrinter &MCIP) const { DG.dump(OS, MCIP); }
``````````
</details>
https://github.com/llvm/llvm-project/pull/90056
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