diff --git a/libavutil/x86/float_dsp.asm b/libavutil/x86/float_dsp.asm
index 1c280589af..49d4876447 100644
--- a/libavutil/x86/float_dsp.asm
+++ b/libavutil/x86/float_dsp.asm
@@ -268,21 +268,23 @@ cglobal scalarproduct_float, 3,3,2, v1, v2, offset
 ;-----------------------------------------------------------------------------
 INIT_XMM sse
 cglobal butterflies_float, 3,3,3, src0, src1, len
-    movsxdifnidn lenq, lend
-    test         lenq, lenq
-    jz           .end
-    shl          lenq, 2
-    add         src0q, lenq
-    add         src1q, lenq
-    neg          lenq
+%if ARCH_X86_64
+    movsxd    lenq, lend
+%endif
+    test      lenq, lenq
+    jz .end
+    shl       lenq, 2
+    add      src0q, lenq
+    add      src1q, lenq
+    neg       lenq
 .loop:
-    mova           m0, [src0q + lenq]
-    mova           m1, [src1q + lenq]
-    subps          m2, m0, m1
-    addps          m0, m0, m1
-    mova      [src1q + lenq], m2
-    mova      [src0q + lenq], m0
-    add          lenq, mmsize
-    jl          .loop
+    mova        m0, [src0q + lenq]
+    mova        m1, [src1q + lenq]
+    subps       m2, m0, m1
+    addps       m0, m0, m1
+    mova        [src1q + lenq], m2
+    mova        [src0q + lenq], m0
+    add       lenq, mmsize
+    jl .loop
 .end:
     REP_RET