From 35b0ddab0ee8064d23c6f390e30da14e756b5ba6 Mon Sep 17 00:00:00 2001
From: Diana Picus <diana.picus@linaro.org>
Date: Mon, 7 Jun 2021 11:48:32 +0000
Subject: [PATCH] [flang] Define the API for CPU_TIME

CPU_TIME takes a single real scalar INTENT(OUT) argument. We can
therefore return a double and let lowering handle casting that to the
precision used for the default real kind.

Differential Revision: https://reviews.llvm.org/D103805
---
 flang/runtime/time-intrinsic.h | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 flang/runtime/time-intrinsic.h

diff --git a/flang/runtime/time-intrinsic.h b/flang/runtime/time-intrinsic.h
new file mode 100644
index 0000000..835f24c
--- /dev/null
+++ b/flang/runtime/time-intrinsic.h
@@ -0,0 +1,27 @@
+//===-- runtime/time-intrinsic.h --------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// Defines the API between compiled code and the implementations of time-related
+// intrinsic subroutines in the runtime library.
+
+#ifndef FORTRAN_RUNTIME_TIME_INTRINSIC_H_
+#define FORTRAN_RUNTIME_TIME_INTRINSIC_H_
+
+#include "cpp-type.h"
+#include "entry-names.h"
+
+namespace Fortran::runtime {
+extern "C" {
+
+// Lowering may need to cast this result to match the precision of the default
+// real kind.
+double RTNAME(CpuTime)();
+
+} // extern "C"
+} // namespace Fortran::runtime
+#endif // FORTRAN_RUNTIME_TIME_INTRINSIC_H_
-- 
2.7.4