[FFmpeg-devel] [PATCH] lavc/x86/videodsp: Fix clobbered FPU state on x86-32

[Frank Plowman]

These assembly optimisations can use MMX.  They failed to reset the
floating-point state when they are done, hence subsequent floating-point
operations return nonsense values.

This fixes the FATE failure for vvc-output-ref on x86-32, e.g.
https://fate.ffmpeg.org/report.cgi?slot=x86_32-uubuntu-mingw32-gcc&time=20241110053421

Signed-off-by: Frank Plowman <post at frankplowman.com>
---
 libavcodec/x86/videodsp.asm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/x86/videodsp.asm b/libavcodec/x86/videodsp.asm
index 3cc07878d3..6144f13fca 100644
--- a/libavcodec/x86/videodsp.asm
+++ b/libavcodec/x86/videodsp.asm
@@ -313,6 +313,7 @@ cglobal emu_edge_vfix %+ %%n, 1, 5, 1, dst, src, start_y, end_y, bh
     jnz .bottom_loop                            ; }
 
 .end:
+    emms
     RET
 %assign %%n %%n+1
 %endrep ; 1+%2-%1
-- 
2.46.0