[llvm-exegesis] Allow benchmarking arbitrary code snippets.

Summary:

This is a step towards fixing PR38048.

Note that right now the measurements are given per instruction. We'll
need to give measurements a per code snippet and update the analysis (PR38731).

Reviewers: gchatelet

Subscribers: tschuett, llvm-commits

Differential Revision: https://reviews.llvm.org/D52041

llvm-svn: 342947

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h b/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h
index 03708683106..f0032555546 100644
--- a/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h
+++ b/llvm/tools/llvm-exegesis/lib/BenchmarkCode.h
@@ -10,12 +10,19 @@
 #ifndef LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKCODE_H
 #define LLVM_TOOLS_LLVM_EXEGESIS_BENCHMARKCODE_H
 
+#include "llvm/ADT/APInt.h"
 #include "llvm/MC/MCInst.h"
 #include <string>
 #include <vector>
 
 namespace exegesis {
 
+// A simple object storing the value for a particular register.
+struct RegisterValue {
+  unsigned Register;
+  llvm::APInt Value;
+};
+
 // A collection of instructions that are to be assembled, executed and measured.
 struct BenchmarkCode {
   // The sequence of instructions that are to be repeated.