From c3f0235696b59d22cf4c90ed18406d7b636af2f0 Mon Sep 17 00:00:00 2001
From: arphaman <arphaman@gmail.com>
Date: Sat, 24 Aug 2013 16:36:25 +0100
Subject: added support for ETIME intrinsic

---
 CMakeLists.txt            |  1 +
 include/System/System.h   | 18 ++++++++++++++++++
 lib/CMakeLists.txt        |  1 +
 lib/System/CMakeLists.txt |  2 ++
 lib/System/System.cpp     | 21 +++++++++++++++++++++
 5 files changed, 43 insertions(+)
 create mode 100644 include/System/System.h
 create mode 100644 lib/System/CMakeLists.txt
 create mode 100644 lib/System/System.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 468ced3..3f59e89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,7 @@ add_library(libflang ${libkind} lib/Libflang.cpp
   lib/Numerical/Complex.cpp
   lib/Strings/Character.cpp
   lib/IO/Write.cpp
+  lib/System/System.cpp
 )
 
 set(BUG_REPORT_URL "http://llvm.org/bugs/" CACHE STRING
diff --git a/include/System/System.h b/include/System/System.h
new file mode 100644
index 0000000..aa3da84
--- /dev/null
+++ b/include/System/System.h
@@ -0,0 +1,18 @@
+//===--- System.h - The system library  -------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBFLANG_CORE_H
+#define LLVM_LIBFLANG_CORE_H
+
+#include "Libflang.h"
+
+LIBFLANG_ABI void  libflang_sys_init();
+LIBFLANG_ABI float libflang_etime(float *time0, float *time1);
+
+#endif
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 34c0fd8..903454d 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -2,3 +2,4 @@ add_subdirectory(Core)
 add_subdirectory(Numerical)
 add_subdirectory(Strings)
 add_subdirectory(IO)
+add_subdirectory(System)
diff --git a/lib/System/CMakeLists.txt b/lib/System/CMakeLists.txt
new file mode 100644
index 0000000..513a048
--- /dev/null
+++ b/lib/System/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_libflang_library(libflangSystem
+  System.cpp)
diff --git a/lib/System/System.cpp b/lib/System/System.cpp
new file mode 100644
index 0000000..4964921
--- /dev/null
+++ b/lib/System/System.cpp
@@ -0,0 +1,21 @@
+#include <sys/time.h>
+#include <stdint.h>
+#include "System/System.h"
+
+// FIXME: windows support.
+
+static timeval programStart;
+
+LIBFLANG_ABI void libflang_sys_init() {
+  gettimeofday(&programStart, nullptr);
+}
+
+LIBFLANG_ABI float libflang_etime(float *time0, float *time1) {
+  timeval stop;
+  gettimeofday(&stop, nullptr);
+  int64_t diff = stop.tv_usec - programStart.tv_usec;
+
+  *time0 = float(double(diff) / 1000000.0);
+  *time1 = 0.0f;
+  return *time0 + *time1;
+}
-- 
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