[patch] Textrel fix for libavcodec on amd64

ffmpeg-0.4.9_p20090201-amd64-textrel.patch (text/plain), 1.24 KB, created by Ralph Sennhauser (RETIRED) on 2009-02-18 20:03:51 UTC

diff -Nurp ffmpeg-old/libavcodec/x86/fft_mmx.asm ffmpeg-new/libavcodec/x86/fft_mmx.asm
--- ffmpeg-old/libavcodec/x86/fft_mmx.asm	2009-02-13 01:03:22.000000000 +0100
+++ ffmpeg-new/libavcodec/x86/fft_mmx.asm	2009-02-18 18:03:32.000000000 +0100
@@ -446,16 +446,34 @@ fft %+ n %+ %3%2:
 %endrep
 %undef n
 
-align 8
-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.
+; 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 fft_dispatch%3%2, 2,5,0, z, nbits
-    lea r2, [dispatch_tab%3%2 GLOBAL]
-    mov r2, [r2 + (nbitsq-2)*gprsize]
+
+; FIXME: The following jump table like construction can be solved better, I
+; just dont know how to manipulate the program counter
+%assign i 2
+%rep 15
+    cmp nbitsq, i 
+    je  L %+ i %+ %3%2
+%assign i i+1
+%endrep
+
+%assign i 2
+%rep 15
+L  %+ i %+ %3%2:
+%assign k 1<<i 
+%if (%1==5 && i==4) || i<4 
+    lea r2, [fft %+ k %+ %2 GLOBAL]
+%else
+    lea r2, [fft %+ k %+ %3%2 GLOBAL]
+%endif
     call r2
     RET
+%assign i i+1
+%endrep
+%undef i
+
 %endmacro ; DECL_FFT
 
 DECL_FFT 5, _sse