Add automatic prefix handling to yasm functions. Does nothing now, but will...

Add automatic prefix handling to yasm functions.  Does nothing now, but will be useful for porting x264 asm in the future.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16234 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/i386/dsputil_yasm.asm

@@ -34,7 +34,7 @@ section .text align=16
 
 %macro FLOAT_TO_INT16_INTERLEAVE6 1
 ; void ff_float_to_int16_interleave6_sse(int16_t *dst, const float **src, int len)
-cglobal ff_float_to_int16_interleave6_%1, 2,7,0, dst, src, src1, src2, src3, src4, src5
+cglobal float_to_int16_interleave6_%1, 2,7,0, dst, src, src1, src2, src3, src4, src5
 %ifdef ARCH_X86_64
     %define lend r10d
     mov     lend, r2d

libavcodec/i386/fft_mmx.asm

@@ -451,7 +451,7 @@ dispatch_tab%3%2: pointer list_of_fft
 
 ; On x86_32, this function does the register saving and restoring for all of fft.
 ; The others pass args in registers and don't spill anything.
-cglobal ff_fft_dispatch%3%2, 2,5,0, z, nbits
+cglobal fft_dispatch%3%2, 2,5,0, z, nbits
     lea r2, [dispatch_tab%3%2 GLOBAL]
     mov r2, [r2 + (nbitsq-2)*gprsize]
     call r2

libavcodec/i386/x86inc.asm

@@ -370,20 +370,14 @@ DECLARE_REG 6, ebp, ebp, bp, null, [esp + stack_offset + 28]
 
 ; Symbol prefix for C linkage
 %macro cglobal 1-2+
+    %xdefine %1 ff_%1
+    %ifdef PREFIX
+        %xdefine %1 _ %+ %1
+    %endif
     %ifidn __OUTPUT_FORMAT__,elf
-        %ifdef PREFIX
-            global _%1:function hidden
-            %define %1 _%1
-        %else
-            global %1:function hidden
-        %endif
+        global %1:function hidden
     %else
-        %ifdef PREFIX
-            global _%1
-            %define %1 _%1
-        %else
-            global %1
-        %endif
+        global %1
     %endif
     align function_align
     %1: