[llvm-exegesis][NFC] Split BenchmarkRunner class

Summary:
The snippet-generation part goes to the SnippetGenerator class.

This will allow benchmarking arbitrary code (see PR38437).

Reviewers: gchatelet

Subscribers: mgorny, tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D51979

llvm-svn: 342117

1 files changed, 38 insertions, 0 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h b/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h
new file mode 100644
index 00000000000..1195adf45f3
--- /dev/null
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h
@@ -0,0 +1,38 @@
+//===-- BenchmarkCode.h -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKCODE_H
+#define LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKCODE_H
+
+#include "llvm/MC/MCInst.h"
+#include <string>
+#include <vector>
+
+namespace exegesis {
+
+// A collection of instructions that are to be assembled, executed and measured.
+struct BenchmarkCode {
+  // The sequence of instructions that are to be repeated.
+  std::vector<llvm::MCInst> Instructions;
+
+  // Before the code is executed some instructions are added to setup the
+  // registers initial values.
+  std::vector<unsigned> RegsToDef;
+
+  // We also need to provide the registers that are live on entry for the
+  // assembler to generate proper prologue/epilogue.
+  std::vector<unsigned> LiveIns;
+
+  // Informations about how this configuration was built.
+  std::string Info;
+};
+
+} // namespace exegesis
+
+#endif // LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKCODE_H