allow compiling without yasm/nasm on x86 and x86-64 platforms

git-svn-id: svn://svn.videolan.org/x264/trunk@658 df754926-b1dd-0310-bc7b-ec298dee348c

Makefile

@@ -19,6 +19,7 @@ endif
 
 # MMX/SSE optims
 ifeq ($(ARCH),X86)
+ifneq ($(AS),)
 SRCS   += common/i386/mc-c.c common/i386/predict-c.c
 ASMSRC  = common/i386/dct-a.asm common/i386/cpu-a.asm \
           common/i386/pixel-a.asm common/i386/mc-a.asm \
@@ -28,9 +29,11 @@ ASMSRC  = common/i386/dct-a.asm common/i386/cpu-a.asm \
 OBJASM  = $(ASMSRC:%.asm=%.o)
 ASFLAGS += -Icommon/i386/
 endif
+endif
 
 # MMX/SSE optims
 ifeq ($(ARCH),X86_64)
+ifneq ($(AS),)
 SRCS   += common/i386/mc-c.c common/i386/predict-c.c
 ASMSRC  = common/amd64/dct-a.asm common/amd64/cpu-a.asm \
           common/amd64/pixel-a.asm common/amd64/mc-a.asm \
@@ -40,6 +43,7 @@ ASMSRC  = common/amd64/dct-a.asm common/amd64/cpu-a.asm \
 OBJASM  = $(ASMSRC:%.asm=%.o)
 ASFLAGS += -Icommon/amd64
 endif
+endif
 
 # AltiVec optims
 ifeq ($(ARCH),PPC)

common/cpu.c

@@ -37,7 +37,7 @@
 
 #include "common.h"
 
-#if defined(ARCH_X86) || defined(ARCH_X86_64)
+#if ( defined(ARCH_X86) || defined(ARCH_X86_64) ) && defined(HAVE_MMX)
 extern int  x264_cpu_cpuid_test( void );
 extern uint32_t  x264_cpu_cpuid( uint32_t op, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx );
 extern void x264_emms( void );
@@ -49,10 +49,6 @@ uint32_t x264_cpu_detect( void )
     uint32_t eax, ebx, ecx, edx;
     int      b_amd;
 
-#ifndef HAVE_MMX
-    return 0;
-#endif
-
     if( !x264_cpu_cpuid_test() )
     {
         /* No cpuid */

configure

@@ -147,7 +147,6 @@ esac
 case "${MACHINE%%-*}" in
   i*86)
     ARCH="X86"
-    CFLAGS="$CFLAGS -DHAVE_MMX"
     AS="yasm"
     ASFLAGS="-O2"
     if [ "$SYS" = MACOSX ]; then
@@ -163,7 +162,6 @@ case "${MACHINE%%-*}" in
     ;;
   x86_64)
     ARCH="X86_64"
-    CFLAGS="$CFLAGS -DHAVE_MMX"
     AS="yasm"
     ASFLAGS="-f elf -m amd64"
     ;;
@@ -215,19 +213,23 @@ then
   then
     echo "Your version of 'nasm' is too old."
     echo "Please install Xcode 2.4.1 or later."
-    exit 1
+    AS=""
   fi
 fi
 
 if [ $ARCH = X86 -o $ARCH = X86_64 ] ; then
-    if ! as_check ; then
-        echo "No assembler. Please install yasm."
-        exit 1
+    if as_check ; then
+        CFLAGS="$CFLAGS -DHAVE_MMX"
     fi
     if as_check "pabsw xmm0, xmm0" ; then
         ASFLAGS="$ASFLAGS -DHAVE_SSE3"
         CFLAGS="$CFLAGS -DHAVE_SSE3"
     fi
+    if ! as_check ; then
+        echo "No suitable assembler found.  x264 will be several times slower."
+        echo "Please install 'yasm' to get MMX/SSE optimized code."
+        AS=""
+    fi
 fi
 
 CFLAGS="$CFLAGS -DARCH_$ARCH -DSYS_$SYS"