diff --git a/libavcodec/i386/dsputil_yasm.asm b/libavcodec/i386/dsputil_yasm.asm
new file mode 100644
index 0000000000..09beb5cf42
--- /dev/null
+++ b/libavcodec/i386/dsputil_yasm.asm
@@ -0,0 +1,92 @@
+;******************************************************************************
+;* MMX optimized DSP utils
+;* Copyright (c) 2008 Loren Merritt
+;*
+;* This file is part of FFmpeg.
+;*
+;* FFmpeg is free software; you can redistribute it and/or
+;* modify it under the terms of the GNU Lesser General Public
+;* License as published by the Free Software Foundation; either
+;* version 2.1 of the License, or (at your option) any later version.
+;*
+;* FFmpeg is distributed in the hope that it will be useful,
+;* but WITHOUT ANY WARRANTY; without even the implied warranty of
+;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;* Lesser General Public License for more details.
+;*
+;* You should have received a copy of the GNU Lesser General Public
+;* License along with FFmpeg; if not, write to the Free Software
+;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+;******************************************************************************
+
+%include "x86inc.asm"
+
+section .text align=16
+
+%macro PSWAPD_SSE 2
+    pshufw %1, %2, 0x4e
+%endmacro
+%macro PSWAPD_3DN1 2
+    movq  %1, %2
+    psrlq %1, 32
+    punpckldq %1, %2
+%endmacro
+
+%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
+%ifdef ARCH_X86_64
+    %define lend r10d
+    mov     lend, r2d
+%else
+    %define lend dword r2m
+%endif
+    mov src1q, [srcq+1*gprsize]
+    mov src2q, [srcq+2*gprsize]
+    mov src3q, [srcq+3*gprsize]
+    mov src4q, [srcq+4*gprsize]
+    mov src5q, [srcq+5*gprsize]
+    mov srcq,  [srcq]
+    sub src1q, srcq
+    sub src2q, srcq
+    sub src3q, srcq
+    sub src4q, srcq
+    sub src5q, srcq
+.loop:
+    cvtps2pi   mm0, [srcq]
+    cvtps2pi   mm1, [srcq+src1q]
+    cvtps2pi   mm2, [srcq+src2q]
+    cvtps2pi   mm3, [srcq+src3q]
+    cvtps2pi   mm4, [srcq+src4q]
+    cvtps2pi   mm5, [srcq+src5q]
+    packssdw   mm0, mm3
+    packssdw   mm1, mm4
+    packssdw   mm2, mm5
+    pswapd     mm3, mm0
+    punpcklwd  mm0, mm1
+    punpckhwd  mm1, mm2
+    punpcklwd  mm2, mm3
+    pswapd     mm3, mm0
+    punpckldq  mm0, mm2
+    punpckhdq  mm2, mm1
+    punpckldq  mm1, mm3
+    movq [dstq   ], mm0
+    movq [dstq+16], mm2
+    movq [dstq+ 8], mm1
+    add srcq, 8
+    add dstq, 24
+    sub lend, 2
+    jg .loop
+    emms
+    RET
+%endmacro ; FLOAT_TO_INT16_INTERLEAVE6
+
+%define pswapd PSWAPD_SSE
+FLOAT_TO_INT16_INTERLEAVE6 sse
+%define cvtps2pi pf2id
+%define pswapd PSWAPD_3DN1
+FLOAT_TO_INT16_INTERLEAVE6 3dnow
+%undef pswapd
+FLOAT_TO_INT16_INTERLEAVE6 3dn2
+%undef cvtps2pi
+