commit 7b852cd814bfc9840640b52933e7fd427b8fd39c
author Guillaume Chatelet <gchatelet@google.com> Thu Jun 07 08:11:54 2018 +0000
committer Guillaume Chatelet <gchatelet@google.com> Thu Jun 07 08:11:54 2018 +0000
tree aed7300c6b96d4811ec25bca4f4448b59f89ee41
parent b9c78e41ba4cfd721dd542daef1e1ba7d74b298e

[llvm-exegesis] Add a Configuration object for Benchmark.

Summary: This is the first step to have the BenchmarkRunner create and measure many different configurations (different initial values for instance).

Reviewers: courbet

Subscribers: tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D47826

llvm-svn: 334169

llvm/tools/llvm-exegesis/lib/Latency.cpp

diff --git a/llvm/tools/llvm-exegesis/lib/Latency.cpp b/llvm/tools/llvm-exegesis/lib/Latency.cpp
index 9c4ed56..59097e1 100644
--- a/llvm/tools/llvm-exegesis/lib/Latency.cpp
+++ b/llvm/tools/llvm-exegesis/lib/Latency.cpp
@@ -56,11 +56,12 @@
   return InstructionBenchmark::Latency;
 }
 
-llvm::Expected<std::vector<llvm::MCInst>>
-LatencyBenchmarkRunner::createSnippet(RegisterAliasingTrackerCache &RATC,
-                                      unsigned Opcode,
-                                      llvm::raw_ostream &Info) const {
-  std::vector<llvm::MCInst> Snippet;
+llvm::Expected<BenchmarkConfiguration>
+LatencyBenchmarkRunner::createConfiguration(RegisterAliasingTrackerCache &RATC,
+                                            unsigned Opcode,
+                                            llvm::raw_ostream &Info) const {
+  BenchmarkConfiguration Configuration;
+  std::vector<llvm::MCInst> &Snippet = Configuration.Snippet;
   const llvm::MCInstrDesc &MCInstrDesc = MCInstrInfo.get(Opcode);
   const Instruction ThisInstruction(MCInstrDesc, RATC);
 
@@ -77,7 +78,7 @@
       Info << "implicit Self cycles, picking random values.\n";
     }
     Snippet.push_back(randomizeUnsetVariablesAndBuild(ThisInstruction));
-    return Snippet;
+    return Configuration;
   }
 
   // Let's try to create a dependency through another opcode.
@@ -102,7 +103,7 @@
          << ".\n";
     Snippet.push_back(randomizeUnsetVariablesAndBuild(ThisInstruction));
     Snippet.push_back(randomizeUnsetVariablesAndBuild(OtherInstruction));
-    return Snippet;
+    return Configuration;
   }
 
   return makeError(