From 2a2741ff121f0c72ca4f78caf99f7b85ac05b2f9 Mon Sep 17 00:00:00 2001
From: Jeff Genovy <29107334+jefgen@users.noreply.github.com>
Date: Tue, 13 Mar 2018 01:10:11 +0000
Subject: [PATCH] ICU-13636 The VS2017 optimizer has issues with this function.
 Disable optimizations for now as a work-around.

X-SVN-Rev: 41095
---
 icu4c/source/test/cintltst/utf8tst.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/icu4c/source/test/cintltst/utf8tst.c b/icu4c/source/test/cintltst/utf8tst.c
index b7062e3b82f..9f4109c2078 100644
--- a/icu4c/source/test/cintltst/utf8tst.c
+++ b/icu4c/source/test/cintltst/utf8tst.c
@@ -757,6 +757,14 @@ static void TestFwdBack() {
     }
 }
 
+/**
+* Ticket #13636 - Visual Studio 2017 has problems optimizing this function.
+* As a workaround, we will turn off optimization just for this function on VS2017 and above.
+*/
+#if defined(_MSC_VER) && (_MSC_VER > 1900)
+#pragma optimize( "", off )
+#endif
+
 static void TestFwdBackUnsafe() {
     /*
      * Use a (mostly) well-formed UTF-8 string and test at code point boundaries.
@@ -842,6 +850,13 @@ static void TestFwdBackUnsafe() {
     }
 }
 
+/**
+* Ticket #13636 - Turn optimization back on.
+*/
+#if defined(_MSC_VER) && (_MSC_VER > 1900)
+#pragma optimize( "", on )
+#endif
+
 static void TestSetChar() {
     static const uint8_t input[]
         = {0x61, 0xe4, 0xba, 0x8c, 0x7f, 0xfe, 0x62, 0xc5, 0x7f, 0x61, 0x80, 0x80, 0xe0, 0x00 };
-- 
2.40.0