fix the dcbz check and move it in configure

Originally committed as revision 6580 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -349,6 +349,7 @@ mmx="default"
 armv5te="default"
 iwmmxt="default"
 altivec="default"
+dcbzl="no"
 mmi="default"
 case "$cpu" in
   i386|i486|i586|i686|i86pc|BePC)
@@ -1139,6 +1140,19 @@ if test "$?" != 0; then
     die "C compiler test failed."
 fi
 
+# check for assembler specific support
+
+if test $cpu = "powerpc"; then
+check_cc <<EOF && dcbzl=yes
+int main(void) {
+    register long zero = 0;
+    char data[1024];
+    asm volatile("dcbzl %0, %1" : : "b" (data), "r" (zero));
+return 0;
+}
+EOF
+fi
+
 # check for SIMD availability
 
 # AltiVec flags: The FSF version of GCC differs from the Apple version
@@ -1572,6 +1586,7 @@ if test $cpu = "mips"; then
 fi
 if test $cpu = "powerpc"; then
     echo "AltiVec enabled  $altivec"
+    echo "dcbzl available  $dcbzl"
 fi
 echo "gprof enabled    $gprof"
 echo "zlib enabled     $zlib"
@@ -1763,6 +1778,13 @@ if test "$mmi" = "yes" ; then
   echo "TARGET_MMI=yes" >> config.mak
   echo "#define HAVE_MMI 1" >> $TMPH
 fi
+
+if test "$dcbzl" = "yes" ; then
+  echo "#define HAVE_DCBZL 1" >> $TMPH
+else
+  echo "#undef HAVE_DCBZL" >> $TMPH
+fi
+
 if test "$altivec" = "yes" ; then
   echo "TARGET_ALTIVEC=yes" >> config.mak
   echo "#define HAVE_ALTIVEC 1" >> $TMPH

libavcodec/ppc/dsputil_ppc.c

@@ -175,7 +175,7 @@ POWERPC_PERF_STOP_COUNT(powerpc_clear_blocks_dcbz32, 1);
 
 /* same as above, when dcbzl clear a whole 128B cache line
    i.e. the PPC970 aka G5 */
-#ifndef NO_DCBZL
+#ifdef HAVE_DCBZL
 void clear_blocks_dcbz128_ppc(DCTELEM *blocks)
 {
 POWERPC_PERF_DECLARE(powerpc_clear_blocks_dcbz128, 1);
@@ -205,7 +205,7 @@ void clear_blocks_dcbz128_ppc(DCTELEM *blocks)
 }
 #endif
 
-#ifndef NO_DCBZL
+#ifdef HAVE_DCBZL
 /* check dcbz report how many bytes are set to 0 by dcbz */
 /* update 24/06/2003 : replace dcbz by dcbzl to get
    the intended effect (Apple "fixed" dcbz)

libavcodec/ppc/dsputil_ppc.h

@@ -21,17 +21,6 @@
 #ifndef _DSPUTIL_PPC_
 #define _DSPUTIL_PPC_
 
-#ifdef CONFIG_DARWIN
-/* The Apple assembler shipped w/ gcc-3.3 knows about DCBZL, previous assemblers don't
-   We assume here that the Darwin GCC is from Apple.... */
-#if (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
-#define NO_DCBZL
-#endif
-#else /* CONFIG_DARWIN */
-/* I don't think any non-Apple assembler knows about DCBZL */
-#define NO_DCBZL
-#endif /* CONFIG_DARWIN */
-
 #ifdef POWERPC_PERFORMANCE_REPORT
 void powerpc_display_perf_report(void);
 /* the 604* have 2, the G3* have 4, the G4s have 6,