From f1ecc2c50d0976f3d8f0eaf805cbc399c0780d8b Mon Sep 17 00:00:00 2001
From: Maarten Bent <MaartenBent@users.noreply.github.com>
Date: Thu, 23 Apr 2020 22:38:12 +0200
Subject: [PATCH] Don't enable SSE2 optimizations when using VC9 and older
 compiler

---
 pngpriv.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pngpriv.h b/pngpriv.h
index d734f9746..35095bea6 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -211,7 +211,10 @@
        * enable SSE optimizations.  This means that these optimizations will
        * be off by default.  See contrib/intel for more details.
        */
-#     if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
+#     if defined(_MSC_VER) && _MSC_VER <= 1500
+          // Don't enable for VC9 and older: missing include file immintrin.h
+#         define PNG_INTEL_SSE_OPT 0
+#     elif defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \
        defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \
        (defined(_M_IX86_FP) && _M_IX86_FP >= 2)
 #         define PNG_INTEL_SSE_OPT 1