PPC asm for AV_RL*()

PPC is normally big endian but has special little endian load/store
instructions.  Using these avoids a separate byteswap.  This makes the
vorbis decoder about 5% faster.  Not much else uses little-endian
read/write extensively.

GCC generates horrible PPC code for the default AV_[RW]B64 (which uses
a packed struct), so we override it with a plain pointer cast.

Originally committed as revision 18602 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 2 insertions, 1 deletions

diff --git a/configure b/configure
index a5f608a5ff..1480515a1b 100755
--- a/configure
+++ b/configure
@@ -890,6 +890,7 @@ HAVE_LIST="
     getrusage
     inet_aton
     inline_asm
+    ldbrx
     libdc1394_1
     libdc1394_2
     llrint
@@ -1807,7 +1808,7 @@ if test $cpu != "generic"; then
         Cell|CELL|cell)
             add_cflags -mcpu=cell
             warn_altivec disabled Cell
-            enable ppc64
+            enable ppc64 ldbrx
         ;;
         # targets that do NOT support conditional mov (cmov)
         i[345]86|pentium|pentium-mmx|k6|k6-[23]|winchip-c6|winchip2|c3)