[llvm-exegesis] Add lit tests (v2).

Summary: This revisits rL342953 by adding detection of host support.

Reviewers: gchatelet, lebedev.ri, alexshap

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D52464

llvm-svn: 342975

1 files changed, 2 insertions, 4 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
index 1536e8a5624..c2e57819bb4 100644
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
@@ -35,6 +35,8 @@ BenchmarkRunner::~BenchmarkRunner() = default;
 // code.
 static std::vector<llvm::MCInst>
 GenerateInstructions(const BenchmarkCode &BC, const size_t MinInstructions) {
+  if (BC.Instructions.empty())
+    return {};
   std::vector<llvm::MCInst> Code = BC.Instructions;
   for (int I = 0; Code.size() < MinInstructions; ++I)
     Code.push_back(BC.Instructions[I % BC.Instructions.size()]);
@@ -53,10 +55,6 @@ BenchmarkRunner::runConfiguration(const BenchmarkCode &BC,
   InstrBenchmark.Info = BC.Info;
 
   const std::vector<llvm::MCInst> &Instructions = BC.Instructions;
-  if (Instructions.empty()) {
-    InstrBenchmark.Error = "Empty snippet";
-    return InstrBenchmark;
-  }
 
   InstrBenchmark.Key.Instructions = Instructions;