Fixed bug 1434 - Add AltiVec detection for OpenBSD/powerpc

Brad Smith 2012-02-29 19:31:46 PST

The attached patch adds AltiVec detection for OpenBSD/powerpc. Please apply the
patch to both 2.0 and 1.2.

src/cpuinfo/SDL_cpuinfo.c

@@ -28,6 +28,10 @@
 
 #if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))
 #include <sys/sysctl.h> /* For AltiVec check */
+#elif defined(__OpenBSD__) && defined(__powerpc__)
+#include <sys/param.h>
+#include <sys/sysctl.h> /* For AltiVec check */
+#include <machine/cpu.h>
 #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
 #include <signal.h>
 #include <setjmp.h>
@@ -42,7 +46,7 @@
 #define CPU_HAS_SSE2	0x00000080
 #define CPU_HAS_ALTIVEC	0x00000100
 
-#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__
+#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
 /* This is the brute force way of detecting instruction sets...
    the idea is borrowed from the libmpeg2 library - thanks!
  */
@@ -359,8 +363,12 @@ static __inline__ int CPU_haveSSE2(void)
 static __inline__ int CPU_haveAltiVec(void)
 {
 	volatile int altivec = 0;
-#if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))
-	int selectors[2] = { CTL_HW, HW_VECTORUNIT }; 
+#if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__))
+# ifdef __OpenBSD__
+	int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
+# else
+	int selectors[2] = { CTL_HW, HW_VECTORUNIT };
+# endif
 	int hasVectorUnit = 0; 
 	size_t length = sizeof(hasVectorUnit); 
 	int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);