Only compile and use libmpeg2 AltiVec code when AltiVec is available. The

AltiVec code needs -maltivec to compile, but then AltiVec instructions
appear in other places of the code causing MPlayer to sigill.
Somehow upstream libmpeg2 manages not to sigill under what appear to be
the same circumstances. Enlightenment welcome.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26657 b3059339-0415-0410-9bf9-f77b7e298cf2

Makefile

@@ -340,7 +340,7 @@ SRCS_COMMON-$(LIBMPEG2)-$(ARCH_ALPHA)   += libmpeg2/idct_alpha.c \
 SRCS_COMMON-$(LIBMPEG2)-$(ARCH_ARMV4L)  += libmpeg2/motion_comp_arm.c \
                                            libmpeg2/motion_comp_arm_s.S \
                                            libmpeg2/motion_comp_iwmmxt.c
-SRCS_COMMON-$(LIBMPEG2)-$(ARCH_POWERPC) += libmpeg2/idct_altivec.c \
+SRCS_COMMON-$(LIBMPEG2)-$(HAVE_ALTIVEC) += libmpeg2/idct_altivec.c \
                                            libmpeg2/motion_comp_altivec.c
 SRCS_COMMON-$(LIBMPEG2)-$(HAVE_MMX)     += libmpeg2/idct_mmx.c \
                                            libmpeg2/motion_comp_mmx.c

libmpeg2/idct.c

@@ -19,6 +19,10 @@
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Modified for use with MPlayer, see libmpeg-0.4.1.diff for the exact changes.
+ * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
+ * $Id$
  */
 
 #include "config.h"
@@ -250,7 +254,7 @@ void mpeg2_idct_init (uint32_t accel)
 	mpeg2_idct_mmx_init ();
     } else
 #endif
-#ifdef ARCH_PPC
+#ifdef HAVE_ALTIVEC
     if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
 	mpeg2_idct_copy = mpeg2_idct_copy_altivec;
 	mpeg2_idct_add = mpeg2_idct_add_altivec;

libmpeg2/libmpeg-0.4.1.diff

@@ -175,6 +175,17 @@
  	    for (j = 0; j < 64; j++)
  		decoder->quantizer_prescale[index][i][j] =
  		    k * mpeg2dec->quantizer_matrix[index][j];
+--- libmpeg2/idct.c	(revision 26652)
++++ libmpeg2/idct.c	(working copy)
+@@ -250,7 +254,7 @@
+ 	mpeg2_idct_mmx_init ();
+     } else
+ #endif
+-#ifdef ARCH_PPC
++#ifdef HAVE_ALTIVEC
+     if (accel & MPEG2_ACCEL_PPC_ALTIVEC) {
+ 	mpeg2_idct_copy = mpeg2_idct_copy_altivec;
+ 	mpeg2_idct_add = mpeg2_idct_add_altivec;
 --- libmpeg2/idct_mmx.c	2006-06-16 20:12:26.000000000 +0200
 +++ libmpeg2/idct_mmx.c	2006-06-16 20:12:50.000000000 +0200
 @@ -23,7 +27,7 @@
@@ -188,6 +199,15 @@
  
 --- libmpeg2/motion_comp.c	2006-06-16 20:12:26.000000000 +0200
 +++ libmpeg2/motion_comp.c	2006-06-16 20:12:50.000000000 +0200
+@@ -46,7 +46,7 @@
+ 	mpeg2_mc = mpeg2_mc_mmx;
+     else
+ #endif
+-#ifdef ARCH_PPC
++#ifdef HAVE_ALTIVEC
+     if (accel & MPEG2_ACCEL_PPC_ALTIVEC)
+ 	mpeg2_mc = mpeg2_mc_altivec;
+     else
 @@ -67,6 +61,13 @@
  	mpeg2_mc = mpeg2_mc_vis;
      else

libmpeg2/motion_comp.c

@@ -46,7 +46,7 @@ void mpeg2_mc_init (uint32_t accel)
 	mpeg2_mc = mpeg2_mc_mmx;
     else
 #endif
-#ifdef ARCH_PPC
+#ifdef HAVE_ALTIVEC
     if (accel & MPEG2_ACCEL_PPC_ALTIVEC)
 	mpeg2_mc = mpeg2_mc_altivec;
     else