Fix for x86 zlib issue

libs/zlibng/arch/x86/insert_string_sse.c

@@ -0,0 +1,56 @@
+/* insert_string_sse -- insert_string variant using SSE4.2's CRC instructions
+ *
+ * Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ */
+
+#include "zbuild.h"
+#include "deflate.h"
+
+/* ===========================================================================
+ * Insert string str in the dictionary and set match_head to the previous head
+ * of the hash chain (the most recent string with same hash key). Return
+ * the previous length of the hash chain.
+ * IN  assertion: all calls to to INSERT_STRING are made with consecutive
+ *    input characters and the first MIN_MATCH bytes of str are valid
+ *    (except for the last MIN_MATCH-1 bytes of the input file).
+ */
+#ifdef X86_SSE4_2_CRC_HASH
+ZLIB_INTERNAL Pos insert_string_sse(deflate_state *const s, const Pos str, unsigned int count) {
+    Pos ret = 0;
+    unsigned int idx;
+    unsigned int *ip, val, h;
+
+    for (idx = 0; idx < count; idx++) {
+        ip = (unsigned *)&s->window[str+idx];
+        memcpy(&val, ip, sizeof(val));
+        h = 0;
+
+        if (s->level >= TRIGGER_LEVEL)
+            val &= 0xFFFFFF;
+
+#ifdef _MSC_VER
+        h = _mm_crc32_u32(h, val);
+#elif defined(X86_SSE4_2_CRC_INTRIN)
+        h = __builtin_ia32_crc32si(h, val);
+#else
+        __asm__ __volatile__ (
+            "crc32 %1,%0\n\t"
+            : "+r" (h)
+            : "r" (val)
+        );
+#endif
+        Pos head = s->head[h & s->hash_mask];
+        if (head != str+idx) {
+            s->prev[(str+idx) & s->w_mask] = head;
+            s->head[h & s->hash_mask] = str+idx;
+            if (idx == count-1)
+              ret = head;
+        } else if (idx == count - 1) {
+          ret = str + idx;
+        }
+    }
+    return ret;
+}
+#endif