Add check for SSE2-support.

2018-04-02 10:27:05 +02:00
parent 676e1c9565
commit 4d662c42b3
5 changed files with 43 additions and 3 deletions
--- a/code/simd.cpp
+++ b/code/simd.cpp
@@ -0,0 +1,34 @@
+#include "simd.h"
+
+namespace Assimp {
+    bool CPUSupportsSSE2() {
+#if defined(__x86_64__) || defined(_M_X64)
+        //* x86_64 always has SSE2 instructions */
+        return true;
+#elif defined(__GNUC__) && defined(i386)
+        // for GCC x86 we check cpuid
+        unsigned int d;
+        __asm__(
+            "pushl %%ebx\n\t"
+            "cpuid\n\t"
+            "popl %%ebx\n\t"
+            : "=d" ( d )
+            :"a" ( 1 ) );
+        return ( d & 0x04000000 ) != 0;
+#elif (defined(_MSC_VER) && defined(_M_IX86))
+        // also check cpuid for MSVC x86
+        unsigned int d;
+        __asm {
+            xor     eax, eax
+            inc eax
+            push ebx
+            cpuid
+            pop ebx
+            mov d, edx
+        }
+        return ( d & 0x04000000 ) != 0;
+#else
+        return false;
+#endif
+    }
+}