Integrate SIMD optimisations for zlib

third_party/zlib/x86.c

+/*
+ * x86 feature check
+ *
+ * Copyright (C) 2013 Intel Corporation. All rights reserved.
+ * Author:
+ *  Jim Kukunas
+ * 
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "x86.h"
+
+int x86_cpu_has_sse2;
+int x86_cpu_has_sse42;
+int x86_cpu_has_pclmulqdq;
+
+void x86_check_features(void)
+{
+    unsigned eax, ebx, ecx, edx;
+
+    eax = 1;
+    __asm__ __volatile__ (
+#ifdef X86
+        "xchg %%ebx, %1\n\t"
+#endif
+        "cpuid\n\t"
+#ifdef X86
+        "xchg %1, %%ebx\n\t"
+    : "+a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx)
+#else
+    : "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
+#endif
+    );
+
+    x86_cpu_has_sse2 = edx & 0x4000000;
+    x86_cpu_has_sse42= ecx & 0x100000;
+    x86_cpu_has_pclmulqdq = ecx & 0x2;
+}