From: Mat Berchtold <mberchtold@gmail.com>
Date: Thu, 29 Oct 2015 14:39:32 +0000 (+0100)
Subject: Add support for MSVC crc32 intrinsic
X-Git-Tag: 1.9.9-b1~793^2~32
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e48233b59b94921035dffba44e881777a6e63b9;p=thirdparty%2Fzlib-ng.git

Add support for MSVC crc32 intrinsic
---

diff --git a/deflate_p.h b/deflate_p.h
index 2127792e0..25923a722 100644
--- a/deflate_p.h
+++ b/deflate_p.h
@@ -45,11 +45,15 @@ local inline Pos insert_string_sse(deflate_state *const s, const Pos str, uInt c
         if (s->level >= 6)
             val &= 0xFFFFFF;
 
+#ifdef _MSC_VER
+        h = _mm_crc32_u32(h, val);
+#else
         __asm__ __volatile__ (
             "crc32 %1,%0\n\t"
             : "+r" (h)
             : "r" (val)
         );
+#endif
 
         ret = s->prev[(str+idx) & s->w_mask] = s->head[h & s->hash_mask];
         s->head[h & s->hash_mask] = str+idx;